{"id":95971,"date":"2026-06-24T12:27:49","date_gmt":"2026-06-24T12:27:49","guid":{"rendered":"https:\/\/elithair.com\/uk\/?p=95971"},"modified":"2026-06-24T12:27:49","modified_gmt":"2026-06-24T12:27:49","slug":"keratin-for-hair","status":"publish","type":"post","link":"https:\/\/elithair.com\/uk\/blog\/keratin-for-hair\/","title":{"rendered":"Keratin &#038; Hair: Treatment, Care, Smoothing &#038; Risks (2026)"},"content":{"rendered":"\n<div style=\"background:#f3f7fc;border-left:5px solid #0079F1;border-radius:10px;padding:20px 22px;margin-bottom:28px\">\n<p style=\"margin:0 0 10px;color:#013366;font-weight:700;font-size:18px\">In short: keratin and your hair<\/p>\n<ul style=\"margin:0;padding-left:20px;color:#2e3033;font-size:16px;line-height:1.6\">\n<li>Keratin is the fibre-forming structural protein that makes up roughly <strong>90 per cent<\/strong> of your hair (keratin.com).<\/li>\n<li>&#8220;Keratin for hair&#8221; means two things: nourishing <strong>keratin treatments<\/strong> (smooth the surface, cosmetic) and chemical <strong>keratin smoothing<\/strong> (relaxes curl, lasts 2 to 5 months).<\/li>\n<li>Good for your hair? Nourishing treatments, yes. With smoothing, the sticking point is <strong>formaldehyde<\/strong>: only choose products free of formaldehyde and methylene glycol.<\/li>\n<li>Keratin beautifies the hair fibre, but it has no effect on hair growth or on hair loss at the root.<\/li>\n<\/ul>\n<\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Keratin is everywhere: in shampoo adverts, in the chat at the salon, on the ingredient list of your mask. But what is really behind it, what does a treatment actually do, and when does it become tricky? This guide (as of 2026) explains the protein, gives an honest comparison of treatment, salon blow-out and smoothing, and shows what you need to watch out for when it comes to formaldehyde.<\/p>\n\n\n\n<h2 id=\"h-what-is-keratin-the-protein-in-your-hair-simply-explained\" class=\"wp-block-heading\">What is keratin? The protein in your hair, simply explained<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Keratin is a fibre-forming structural protein and the main building block of hair, nails and the outermost layer of skin. Depending on the source and hair type, human hair is made up of roughly 65 to 95 per cent keratin, with a figure of around 90 per cent often quoted (keratin.com). The rest is water, lipids and traces of minerals and melanin.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Keratin is built from amino acids. The key one is the sulphur-containing amino acid <strong>cysteine<\/strong>: it forms what are known as <strong>disulphide bridges<\/strong> between the protein chains. The denser this network of bridges, the stronger and more resilient the hair (MedLexi.de, medi-karriere.de). In mammals it occurs as so-called <strong>alpha-keratin<\/strong>, whose helical structures give the hair its elasticity.<\/p>\n\n\n\n<div style=\"background:#fff8f0;border-left:5px solid #013366;border-radius:10px;padding:18px 20px;margin:8px 0 28px\">\n<p style=\"margin:0 0 8px;color:#013366;font-weight:700;font-size:16px\">First things first: hair breakage is not the same as hair loss<\/p>\n<p style=\"margin:0;color:#2e3033;font-size:15.5px;line-height:1.6\">Keratin only acts on the <strong>hair fibre<\/strong>, that is to say the surface. <strong>Hair breakage<\/strong> (the fibre snaps due to external damage) can be improved with keratin. <strong>Hair loss<\/strong>, by contrast, originates at the <strong>root<\/strong> and does not respond to care products. If you suspect your hair is thinning, you will find some guidance further down in the section <em>&#8220;When keratin does not help&#8221;<\/em>.<\/p>\n<\/div>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\" style=\"max-width:560px;margin-left:auto;margin-right:auto\"><img loading=\"lazy\" decoding=\"async\" width=\"1536\" height=\"1024\" src=\"https:\/\/elithair.com\/uk\/wp-content\/uploads\/sites\/3\/2026\/06\/keratin_haarfaser.png\" alt=\"Illustration eines Haar-Querschnitts mit Schuppenschicht und Cortex, wo Keratin sitzt\" class=\"wp-image-95966\" style=\"width:560px;max-width:100%;height:auto\" srcset=\"https:\/\/elithair.com\/uk\/wp-content\/uploads\/sites\/3\/2026\/06\/keratin_haarfaser.png 1536w, https:\/\/elithair.com\/uk\/wp-content\/uploads\/sites\/3\/2026\/06\/keratin_haarfaser-300x200.png 300w, https:\/\/elithair.com\/uk\/wp-content\/uploads\/sites\/3\/2026\/06\/keratin_haarfaser-1024x683.png 1024w, https:\/\/elithair.com\/uk\/wp-content\/uploads\/sites\/3\/2026\/06\/keratin_haarfaser-768x512.png 768w\" sizes=\"(max-width: 767px) 100vw, 660px\" \/><\/figure>\n<\/div>\n\n\n<h3 id=\"h-where-in-the-hair-does-the-keratin-sit\" class=\"wp-block-heading\">Where in the hair does the keratin sit?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Keratin sits in two parts of the hair. The <strong>cortex<\/strong> (the cortical layer) makes up 80 to 90 per cent of the hair&#8217;s volume and provides the mechanical strength. The <strong>cuticle<\/strong> (the scale layer) is the outer sheath of flat, overlapping keratin scales that protects the cortex (ScienceDirect). It is this scale layer that most keratin care products work on.<\/p>\n\n\n\n<h3 id=\"h-natural-and-added-keratin-where-it-comes-from\" class=\"wp-block-heading\">Natural and added keratin: where it comes from<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Your body makes its own keratin. The keratin in cosmetics is usually <strong>hydrolysed keratin<\/strong> (INCI: Hydrolyzed Keratin): hydrolysis splits the long protein chains into smaller fragments so they can bind to the hair. It is traditionally obtained from sheep&#8217;s wool, feathers or animal horn (INCI Beauty, keratin-info.de). It is therefore of animal origin.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If you prefer vegan options, there are &#8220;keratin-like&#8221; alternatives: <strong>phytokeratin<\/strong> based on hydrolysed wheat or soy protein (INCI: Hydrolyzed Wheat Protein). It is structurally similar to keratin and conditions comparably, but it is not identical (myrto-naturalcosmetics.de, Jean&amp;Len). Do not confuse keratin with collagen: collagen sits in the skin around the follicle, not in the hair fibre itself (bubsnaturals.com).<\/p>\n\n\n\n<h2 id=\"h-keratin-treatment-keratin-care-or-keratin-smoothing-the-difference\" class=\"wp-block-heading\">Keratin treatment, keratin care or keratin smoothing: the difference<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A keratin treatment can mean three different things, and that is exactly what often gets confused. Anyone searching for &#8220;keratin treatment&#8221; usually means one of these three variants:<\/p>\n\n\n\n<div style=\"border:1px solid #cfe0f5;border-radius:12px;padding:18px 22px;margin:8px 0 22px;background:#fbfdff\">\n<ul style=\"margin:0;padding-left:20px;color:#2e3033;font-size:15.5px;line-height:1.7\">\n<li><strong>1. Keratin treatment (at-home care):<\/strong> a mask or treatment from the chemist, cosmetically smooths the surface, lasts until the next wash, no chemical step.<\/li>\n<li><strong>2. Salon treatment \/ express blow-out:<\/strong> temporary in-salon care for shine and light smoothing, lasts roughly <strong>4 to 8 weeks<\/strong>.<\/li>\n<li><strong>3. Keratin smoothing (chemical):<\/strong> the long-lasting relaxing of curl in a professional salon, lasts <strong>2 to 5 months<\/strong>; this is where the formaldehyde issue is relevant.<\/li>\n<\/ul>\n<\/div>\n\n\n\n<p class=\"wp-block-paragraph\">So many users are only after a conditioning mask, while others want strong smoothing. The nourishing <strong>keratin treatment<\/strong> repairs the look and adds shine, the <strong>salon treatment<\/strong> or express blow-out smooths lightly, and chemical <strong>keratin smoothing<\/strong> relaxes the hair&#8217;s curl long term (numihair.com, clinikally.com). Only the third variant is a genuine chemical process.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Chemical smoothing in the salon works like this: wash the hair, apply the keratin solution and leave it on for about <strong>20 minutes<\/strong>, blow-dry with a round brush and then seal it strand by strand with a <strong>flat iron at around 200 to 230 degrees<\/strong> (keratin.pro). Total time <strong>2 to 4 hours<\/strong>. Many people also know this variant as the &#8220;Brazilian Blowout&#8221; or &#8220;Brazilian keratin treatment&#8221;.<\/p>\n\n\n\n<style data-wp-block-html=\"css\">\n@media(max-width: 600px) {\n.htk-tablewrap{overflow:visible !important}\n  .htk-tablewrap .htk-table,\n  .htk-table{min-width:0 !important;box-shadow:none !important;border-radius:0 !important;overflow:visible !important}\n  .htk-table thead{position:absolute !important;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}\n.htk-table {background: transparent;}\n  .htk-table,.htk-table tbody,.htk-table tfoot,.htk-table tr,.htk-table td{display:block;width:100%}\n  .htk-table tr{\n    margin:0 0 16px;border:1px solid var(--line,rgba(13,44,84,.10));\n    border-radius:var(--r-sm,14px);overflow:hidden;background:#fff;\n    box-shadow:var(--sh-md,0 18px 44px -26px rgba(8,28,58,.40));\n  }\n  .htk-table tr:last-child{margin-bottom:0}\n  .htk-table tr:nth-child(even) td,\n  .htk-table tr:nth-child(odd) td{background:transparent}\n  .htk-table td{\n    border-top:0 !important;border-bottom:1px solid rgba(13,44,84,.08);\n    padding:11px 16px;text-align:left;white-space:normal !important;\n  }\n.htk-table.mob-two-column td{\ntext-align:right;\n}\n  .htk-table td:last-child{border-bottom:0}\n  .htk-table td:empty{display:none}\n  .htk-table td::before{\n    content:attr(data-label);display:block;\n    font-size:11.5px;font-weight:700;letter-spacing:.04em;text-transform:uppercase;\n    color:var(--sky-strong,#3f74c0);margin-bottom:3px;\n  }\n.htk-table.mob-two-column td::before{position:absolute;}\n  .htk-table td:first-child{\n    background:var(--navy,#0d2c54) !important;color:#fff !important;\n    font-size:16px;font-weight:700;padding:13px 16px;text-align:left;\n  }\n  .htk-table td:first-child::before{display:none}\n  .htk-table td:first-child strong{color:#fff}\n  .htk-table td.eli:not(:first-child){color:var(--navy,#0d2c54);font-weight:800}\n  .htk-table td.save:not(:first-child){color:#1e9e63;font-weight:800}\n  .htk-table td.eli:not(:first-child)::before,\n  .htk-table td.save:not(:first-child)::before{color:var(--sky-strong,#3f74c0)}\n  .htk-band--navy .htk-table td:not(:first-child){color:var(--ink,#13233b)}\n  .htk-band--navy .htk-table td:not(:first-child) strong{color:inherit}\n  .htk-band--navy .htk-table td.eli:not(:first-child){color:var(--navy,#0d2c54)}\n  .htk-band--navy .htk-table td.save:not(:first-child){color:#1e9e63}\n  .htk-band--navy .htk-table tfoot td{background:transparent}\n  .htk-table tfoot tr{border:2px solid var(--sky-strong,#3f74c0)}\n.htk-table caption {display:block;}\n}\n<\/style>\n\n<script data-wp-block-html=\"js\">\n(function(){\n  function labelHtkTables(){\n    document.querySelectorAll('.htk-table').forEach(function(table){\n      var heads = table.querySelectorAll('thead th');\n      if(!heads.length) return;\n      var labels = Array.prototype.map.call(heads,function(th){return th.textContent.trim();});\n      table.querySelectorAll('tbody tr, tfoot tr').forEach(function(row){\n        Array.prototype.forEach.call(row.children,function(cell,i){\n          if(labels[i] && !cell.getAttribute('data-label')){\n            cell.setAttribute('data-label', labels[i]);\n          }\n        });\n      });\n    });\n  }\n  if(document.readyState==='loading'){\n    document.addEventListener('DOMContentLoaded', labelHtkTables);\n  }else{ labelHtkTables(); }\n})();\n<\/script>\n\n<div style=\"overflow-x:auto;margin-bottom:14px\">\n<table class=\"htk-table\" style=\"min-width:720px;width:100%;border-collapse:collapse;font-size:15px\">\n<thead><tr style=\"background:#013366;color:#fff\">\n<th style=\"padding:11px;text-align:left\">Criterion<\/th>\n<th style=\"padding:11px;text-align:left\">Keratin treatment (care)<\/th>\n<th style=\"padding:11px;text-align:left\">Salon treatment \/ blow-out<\/th>\n<th style=\"padding:11px;text-align:left\">Keratin smoothing (chemical)<\/th>\n<\/tr><\/thead>\n<tbody>\n<tr style=\"border-bottom:1px solid #e3e8ef\"><td style=\"padding:10px;font-weight:600;color:#013366\">Main aim<\/td><td style=\"padding:10px\">Repair, shine, care<\/td><td style=\"padding:10px\">Shine, light smoothing, frizz gone<\/td><td style=\"padding:10px\">Long-lasting curl relaxing<\/td><\/tr>\n<tr style=\"border-bottom:1px solid #e3e8ef;background:#f3f7fc\"><td style=\"padding:10px;font-weight:600;color:#013366\">Where<\/td><td style=\"padding:10px\">at home or salon<\/td><td style=\"padding:10px\">salon<\/td><td style=\"padding:10px\">professional salon (essential)<\/td><\/tr>\n<tr style=\"border-bottom:1px solid #e3e8ef\"><td style=\"padding:10px;font-weight:600;color:#013366\">Duration<\/td><td style=\"padding:10px\">5 to 20 min<\/td><td style=\"padding:10px\">1 to 2 hrs<\/td><td style=\"padding:10px\">2 to 4 hrs<\/td><\/tr>\n<tr style=\"border-bottom:1px solid #e3e8ef;background:#f3f7fc\"><td style=\"padding:10px;font-weight:600;color:#013366\">Durability<\/td><td style=\"padding:10px\">until the next wash<\/td><td style=\"padding:10px\">approx. 4 to 8 weeks<\/td><td style=\"padding:10px\">2 to 5 months<\/td><\/tr>\n<tr style=\"border-bottom:1px solid #e3e8ef\"><td style=\"padding:10px;font-weight:600;color:#013366\">Smoothing effect<\/td><td style=\"padding:10px\">slight<\/td><td style=\"padding:10px\">moderate<\/td><td style=\"padding:10px\">strong<\/td><\/tr>\n<tr style=\"border-bottom:1px solid #e3e8ef;background:#f3f7fc\"><td style=\"padding:10px;font-weight:600;color:#013366\">Cost (UK)<\/td><td style=\"padding:10px\">approx. \u00a35 to \u00a330 (product)<\/td><td style=\"padding:10px\">approx. \u00a350 to \u00a3120<\/td><td style=\"padding:10px\">approx. \u00a3150 to \u00a3450, up to \u00a3600<\/td><\/tr>\n<tr style=\"border-bottom:1px solid #e3e8ef\"><td style=\"padding:10px;font-weight:600;color:#013366\">Formaldehyde risk<\/td><td style=\"padding:10px\">no<\/td><td style=\"padding:10px\">usually no<\/td><td style=\"padding:10px\">possible, ask for formaldehyde-free<\/td><\/tr>\n<tr style=\"border-bottom:1px solid #e3e8ef;background:#f3f7fc\"><td style=\"padding:10px;font-weight:600;color:#013366\">48-hr wait needed<\/td><td style=\"padding:10px\">no<\/td><td style=\"padding:10px\">no<\/td><td style=\"padding:10px\">yes<\/td><\/tr>\n<\/tbody><\/table><\/div>\n<p style=\"font-size:13px;color:#62708a;margin:0 0 18px\">Guide values. Sources: headmasters-beauty.de, keratin-info.de, perfecthair.ch, numihair.com, clinikally.com.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">An important point on durability: with good care, a classic keratin treatment lasts 3 to 6 months, while a &#8220;Brazilian Blowout&#8221; tends to last 8 to 12 weeks, that is 2 to 3 months (clinikally.com, salon833.com). Unlike a perm, there is no harsh regrowth line, the result grows out gently.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\" style=\"max-width:720px;margin-left:auto;margin-right:auto\"><img loading=\"lazy\" decoding=\"async\" width=\"1536\" height=\"1024\" src=\"https:\/\/elithair.com\/uk\/wp-content\/uploads\/sites\/3\/2026\/06\/keratin_vergleich__uk.png\" alt=\"Comparison graphic of keratin treatment, salon blow-out and keratin smoothing by duration and durability\" class=\"wp-image-95967\" style=\"width:720px;max-width:100%;height:auto\" srcset=\"https:\/\/elithair.com\/uk\/wp-content\/uploads\/sites\/3\/2026\/06\/keratin_vergleich__uk.png 1536w, https:\/\/elithair.com\/uk\/wp-content\/uploads\/sites\/3\/2026\/06\/keratin_vergleich__uk-300x200.png 300w, https:\/\/elithair.com\/uk\/wp-content\/uploads\/sites\/3\/2026\/06\/keratin_vergleich__uk-1024x683.png 1024w, https:\/\/elithair.com\/uk\/wp-content\/uploads\/sites\/3\/2026\/06\/keratin_vergleich__uk-768x512.png 768w\" sizes=\"(max-width: 767px) 100vw, 660px\" \/><\/figure>\n<\/div>\n\n\n<h2 id=\"h-is-keratin-good-for-your-hair-an-honest-look-at-the-benefits-and-effects\" class=\"wp-block-heading\">Is keratin good for your hair? An honest look at the benefits and effects<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Is keratin good for your hair? For the <strong>surface<\/strong>, yes: hydrolysed keratin fills in microscopic gaps in the scale layer, reduces frizz, adds shine and makes the hair easier to comb. It is a cosmetic effect, not regrowth and not a repair of the hair root. Think of keratin as a temporary filler for cracks, not a cure.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The mechanism is well studied. According to the study by Malinauskyte et al. (2020, Int. J. Cosmet. Sci.), small keratin fragments (<strong>221 and 2,577 daltons<\/strong>) penetrate deep into the cortex, while large fragments (75,440 daltons) form a protective film on the cuticle. Fan et al. (2025, Molecules) further showed that treated hair retained its tensile strength after UV exposure, whereas untreated hair lost <strong>14.32 per cent<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Those who benefit most are people with <strong>frizzy, curly, coarse and chemically stressed or bleached hair<\/strong>: less frizz, more shine, and in some cases more than 50 per cent shorter blow-drying time (Healthline). Keratin is less suitable for fine, already straight hair, which it can weigh down and make look flat (Healthline). Anyone who wants to keep their curls should avoid chemical smoothing, as it dissolves the curl pattern.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The honest limit: the effect is temporary and superficial. Hair is a dead keratin fibre, not living tissue. Keratin improves the appearance, but it does not repair the fibre biologically. After a few washes (a treatment) or 2 to 5 months (smoothing), the effect has faded and the treatment is repeated.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\" style=\"max-width:720px;margin-left:auto;margin-right:auto\"><img loading=\"lazy\" decoding=\"async\" width=\"1536\" height=\"1024\" src=\"https:\/\/elithair.com\/uk\/wp-content\/uploads\/sites\/3\/2026\/06\/keratin_anwendung.png\" alt=\"Keratin-Behandlung im Salon: glaetten einer Haarstraehne mit dem Glaetteisen\" class=\"wp-image-95968\" style=\"width:720px;max-width:100%;height:auto\" srcset=\"https:\/\/elithair.com\/uk\/wp-content\/uploads\/sites\/3\/2026\/06\/keratin_anwendung.png 1536w, https:\/\/elithair.com\/uk\/wp-content\/uploads\/sites\/3\/2026\/06\/keratin_anwendung-300x200.png 300w, https:\/\/elithair.com\/uk\/wp-content\/uploads\/sites\/3\/2026\/06\/keratin_anwendung-1024x683.png 1024w, https:\/\/elithair.com\/uk\/wp-content\/uploads\/sites\/3\/2026\/06\/keratin_anwendung-768x512.png 768w\" sizes=\"(max-width: 767px) 100vw, 660px\" \/><\/figure>\n<\/div>\n\n\n<h2 id=\"h-risks-and-downsides-of-keratin-smoothing-the-formaldehyde-problem\" class=\"wp-block-heading\">Risks and downsides of keratin smoothing: the formaldehyde problem<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The biggest risk of keratin smoothing is <strong>formaldehyde<\/strong>. Many smoothing products contain methylene glycol or other formaldehyde releasers that release formaldehyde when heated. The IARC classifies formaldehyde as carcinogenic to humans (Group 1, Monograph 100F, 2012); the European ECHA classifies it as a suspected carcinogen (Carc. 1B, since 2016). Both classifications are grounds for clear caution.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In the EU, <strong>free formaldehyde has been banned in cosmetics since May 2019<\/strong> (Annex II of Regulation (EC) No 1223\/2009). Formaldehyde releasers remain permitted within limits, but they are regulated. Since <strong>31 July 2024<\/strong>, products that release more than <strong>10 ppm<\/strong> of formaldehyde must carry the warning &#8220;releases formaldehyde&#8221; (Regulation (EU) 2022\/1181). So it is not enough to simply look for the word formaldehyde on the label.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Germany&#8217;s Federal Institute for Risk Assessment (BfR) warned back in 2010 (press release 16\/2010): hair-smoothing products that were tested contained 1.6 to 2.0 per cent free formaldehyde, well above the limit of 0.2 per cent. The BfR explicitly advised both consumers and hairdressers against using them. OSHA measured <strong>10 ppm<\/strong> in a salon during blow-drying, five times the short-term limit (OSHA).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In the USA, the FDA proposed a ban on formaldehyde-containing hair straighteners in October 2023 and is sticking with it; the exact timetable, however, is still pending, with the deadline pushed back several times (most recently the end of 2025, CNN January 2026). As of 2026, the ban has therefore been announced but is not yet in force.<\/p>\n\n\n\n<h3 id=\"h-heat-damage-hair-breakage-and-protein-overload\" class=\"wp-block-heading\">Heat damage, hair breakage and protein overload<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Besides formaldehyde, keratin smoothing carries other risks. A flat iron at 200 to 230 degrees can damage the scale layer, especially on fine or already damaged hair. This leads to <strong>hair breakage<\/strong> (the fibre snaps), not to true hair loss from the root. Treatments that are too frequent or too concentrated can trigger a protein overload: the hair becomes stiff and brittle despite the care.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Does keratin make you lose hair? High-quality treatments carried out with suitable products do not damage the hair permanently. Genuine, lasting hair loss caused by keratin is not documented (numihair.com, belgraviacentre.com). In rare individual cases, the chemical and thermal stress can trigger a temporary telogen effluvium, which is reversible.<\/p>\n\n\n\n<div style=\"border:1px solid #cfe0f5;border-radius:12px;padding:22px 24px;margin-bottom:14px;background:#fbfdff\">\n<p style=\"margin:0 0 14px;color:#013366;font-weight:700;font-size:18px\">Checklist: safe keratin smoothing<\/p>\n<ul style=\"margin:0;padding-left:20px;color:#2e3033;font-size:15.5px;line-height:1.75\">\n<li><strong>Before the appointment:<\/strong> check the ingredients and explicitly ask for products free of formaldehyde <em>and<\/em> methylene glycol.<\/li>\n<li><strong>At the salon:<\/strong> make sure there is good ventilation. If the staff put on respirator masks unprompted, that is a warning sign of formaldehyde releasers.<\/li>\n<li><strong>Hair-type check:<\/strong> frizzy, curly, coarse hair benefits most; fine, straight hair only with caution.<\/li>\n<li><strong>Allergy:<\/strong> do a patch test if you have a sensitive scalp; if you have a known formaldehyde allergy, avoid salon smoothing altogether.<\/li>\n<li><strong>Pregnancy or breastfeeding:<\/strong> postpone formaldehyde-containing smoothing, or use only a formaldehyde-free conditioning treatment, and ask your doctor first.<\/li>\n<li><strong>For 48 to 72 hours afterwards:<\/strong> do not wash it, do not tie it up, no hair ties and no clips.<\/li>\n<li><strong>Switch up your care:<\/strong> use a sulphate-free and salt-free shampoo.<\/li>\n<li><strong>Realistic expectations:<\/strong> it lasts 2 to 5 months and grows out softly rather than with a hard regrowth line.<\/li>\n<\/ul>\n<\/div>\n<p style=\"font-size:13px;color:#62708a;margin:0 0 18px\">Sources: BfR, OSHA, EU Cosmetics Regulation, perfecthair.ch, headmasters-beauty.de.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\" style=\"max-width:720px;margin-left:auto;margin-right:auto\"><img loading=\"lazy\" decoding=\"async\" width=\"1536\" height=\"1024\" src=\"https:\/\/elithair.com\/uk\/wp-content\/uploads\/sites\/3\/2026\/06\/keratin_formaldehyd__uk.png\" alt=\"Checklist graphic Safe keratin smoothing with tips on formaldehyde, ventilation and aftercare\" class=\"wp-image-95969\" style=\"width:720px;max-width:100%;height:auto\" srcset=\"https:\/\/elithair.com\/uk\/wp-content\/uploads\/sites\/3\/2026\/06\/keratin_formaldehyd__uk.png 1536w, https:\/\/elithair.com\/uk\/wp-content\/uploads\/sites\/3\/2026\/06\/keratin_formaldehyd__uk-300x200.png 300w, https:\/\/elithair.com\/uk\/wp-content\/uploads\/sites\/3\/2026\/06\/keratin_formaldehyd__uk-1024x683.png 1024w, https:\/\/elithair.com\/uk\/wp-content\/uploads\/sites\/3\/2026\/06\/keratin_formaldehyd__uk-768x512.png 768w\" sizes=\"(max-width: 767px) 100vw, 660px\" \/><\/figure>\n<\/div>\n\n\n<h2 id=\"h-keratin-during-pregnancy-and-common-safety-questions\" class=\"wp-block-heading\">Keratin during pregnancy and common safety questions<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">During pregnancy and breastfeeding, expert bodies advise avoiding keratin smoothing that contains or releases formaldehyde. The basis for this is not proven harm in humans, but the precautionary principle: in high doses, formaldehyde is reprotoxic (animal data, PubMed PMID 11572272). There are no clinical studies specifically on keratin during pregnancy.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Nourishing, formaldehyde-free keratin treatments are considered less problematic, but they should be discussed with the doctor looking after you. Bear in mind: even products marketed as &#8220;formaldehyde-free&#8221; can contain releasers. So do not base your decision on the packaging alone. Formaldehyde is also a known contact allergen and can irritate the scalp, eyes and airways.<\/p>\n\n\n\n<h2 id=\"h-caring-for-hair-with-keratin-before-and-after-the-treatment\" class=\"wp-block-heading\">Caring for hair with keratin: before and after the treatment<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Keratin-treated hair needs <strong>sulphate-free and salt-free<\/strong> care. In the first <strong>48 to 72 hours<\/strong> after smoothing, you should not wash the hair, not tie it up and not use a hair tie or clip, otherwise marks will stay visible in the fresh keratin seal (perfecthair.ch, keratin-info.de). Only after that does the full hold set in.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Why sulphate-free and salt-free? Sulphates are aggressive surfactants that quickly wash out the keratin seal and shorten the treatment; salt works in a similar way (frisurenmachen.de, headmasters-beauty.de). Wash <strong>2 to 3 times a week<\/strong> rather than daily, as that extends the durability. Chlorinated and salt water from a pool or the sea shorten it considerably, so protect your hair or avoid them.<\/p>\n\n\n\n<div style=\"overflow-x:auto;margin-bottom:14px\">\n<table class=\"htk-table\" style=\"min-width:560px;width:100%;border-collapse:collapse;font-size:15px\">\n<thead><tr style=\"background:#013366;color:#fff\">\n<th style=\"padding:11px;text-align:left\">Avoid in your shampoo<\/th>\n<th style=\"padding:11px;text-align:left\">Why<\/th>\n<\/tr><\/thead>\n<tbody>\n<tr style=\"border-bottom:1px solid #e3e8ef\"><td style=\"padding:10px;font-weight:600;color:#013366\">Sodium Lauryl Sulfate (SLS)<\/td><td style=\"padding:10px\">Aggressive surfactant, dissolves the keratin seal<\/td><\/tr>\n<tr style=\"border-bottom:1px solid #e3e8ef;background:#f3f7fc\"><td style=\"padding:10px;font-weight:600;color:#013366\">Sodium Laureth Sulfate (SLES)<\/td><td style=\"padding:10px\">Similar effect to SLS, slightly milder<\/td><\/tr>\n<tr style=\"border-bottom:1px solid #e3e8ef\"><td style=\"padding:10px;font-weight:600;color:#013366\">Sodium Chloride<\/td><td style=\"padding:10px\">Salt dissolves the keratin layer, shortens the durability<\/td><\/tr>\n<tr style=\"border-bottom:1px solid #e3e8ef;background:#f3f7fc\"><td style=\"padding:10px;font-weight:600;color:#013366\">Chlorinated and salt water<\/td><td style=\"padding:10px\">Acts like sodium chloride, plus UV exposure<\/td><\/tr>\n<\/tbody><\/table><\/div>\n<p style=\"font-size:13px;color:#62708a;margin:0 0 18px\">Sources: frisurenmachen.de, headmasters-beauty.de.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Do keratin shampoos and treatments from the chemist do anything? Realistically, yes, as ongoing care. Their keratin content is much lower and the sealing step with a flat iron is missing, so there is <strong>no lasting smoothing effect<\/strong>, but there is shine and protection against hair breakage (dm.de, deinfriseur.de). A top-up of the salon smoothing is usually due every 4 to 6 months and costs around \u00a3150 to \u00a3200.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Can you do keratin at home yourself? Conditioning treatments, yes, no problem. DIY smoothing kits exist too, with an effect lasting 2 to 4 months, but a weaker result than in the salon (Refinery29). Even, safe heat is harder to control at home, and the formaldehyde-free claim is hard to verify. For frizzy or coarse hair, a professional salon is the safer choice.<\/p>\n\n\n\n<h2 id=\"h-when-keratin-does-not-help-a-damaged-surface-or-genuine-hair-loss\" class=\"wp-block-heading\">When keratin does not help: a damaged surface or genuine hair loss?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Keratin improves the look of the hair fibre, but it cannot stop thinning hair or hair loss. The reason: hair loss originates at the <strong>hair root<\/strong>, not at the surface. Keratin helps with frizz, dryness, split ends and hair breakage caused by external damage. It does not help with declining hair density, a widening parting or a receding hairline.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A simplified way to tell them apart: if a hair snaps off without a thickening at the end, it is hair breakage, where keratin can help. If a hair comes out of the root with a small bulb-shaped knot (the bulbus), the issue is the amount of hair, not the fibre. This does not replace a proper diagnosis, it is only a first orientation.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If, despite good care and regular keratin treatments, you notice that there is less hair overall or that your parting is visibly getting wider, you should have the cause assessed rather than just treating the surface. A free hair analysis can help work out whether care is enough or whether there is genuine hair loss. You can also find background information in the overview of the causes of hair loss.<\/p>\n\n\n\n<div class=\"wp-block-buttons has-custom-css is-content-justification-center is-layout-flex wp-container-core-buttons-is-layout-fe48e5de wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link has-white-color has-text-color has-background has-link-color wp-element-button\" href=\"https:\/\/elithair.com\/uk\/hair-analysis\/\" style=\"border-top-left-radius:30px;border-top-right-radius:30px;border-bottom-left-radius:30px;border-bottom-right-radius:30px;background-color:#0079f1\">Start your free hair analysis<\/a><\/div>\n<\/div>\n\n\n\n<h2 id=\"h-faq-keratin-and-hair\" class=\"wp-block-heading\">FAQ: keratin and hair<\/h2>\n\n\n\n<div>\n<div style=\"border:1px solid #e3e8ef;border-radius:10px;padding:16px;margin-bottom:12px\">\n<p style=\"color:#013366;font-weight:600;margin:0 0 6px\">Is keratin good for your hair?<\/p>\n<p style=\"color:#2e3033;margin:0\">For the hair surface, yes: keratin fills in gaps in the scale layer, reduces frizz and adds shine. The effect is cosmetic and temporary, not a biological cure. Frizzy and stressed hair benefits clearly, while fine hair should be dosed carefully, as it can end up looking weighed down.<\/p>\n<\/div>\n<div style=\"border:1px solid #e3e8ef;border-radius:10px;padding:16px;margin-bottom:12px\">\n<p style=\"color:#013366;font-weight:600;margin:0 0 6px\">How long does keratin smoothing last?<\/p>\n<p style=\"color:#2e3033;margin:0\">A classic keratin treatment lasts about 3 to 6 months, a &#8220;Brazilian Blowout&#8221; around 2 to 3 months (8 to 12 weeks). Sulphate-free shampoo, washing less often and avoiding chlorinated and salt water noticeably extend the durability.<\/p>\n<\/div>\n<div style=\"border:1px solid #e3e8ef;border-radius:10px;padding:16px;margin-bottom:12px\">\n<p style=\"color:#013366;font-weight:600;margin:0 0 6px\">How much does a keratin treatment cost?<\/p>\n<p style=\"color:#2e3033;margin:0\">In the UK, keratin smoothing at a salon costs approx. &pound;150 to &pound;450, up to &pound;600 at upmarket salons, depending on hair length, density and region. Top-ups every 4 to 6 months come to around &pound;150 to &pound;200. Conditioning treatments from the chemist cost approx. &pound;5 to &pound;30.<\/p>\n<\/div>\n<div style=\"border:1px solid #e3e8ef;border-radius:10px;padding:16px;margin-bottom:12px\">\n<p style=\"color:#013366;font-weight:600;margin:0 0 6px\">Does keratin smoothing contain formaldehyde and is that dangerous?<\/p>\n<p style=\"color:#2e3033;margin:0\">Some products contain methylene glycol or other formaldehyde releasers that release formaldehyde when heated. Free formaldehyde has been banned in EU cosmetics since 2019; the IARC classifies formaldehyde as a Group 1 carcinogen. So make a point of asking for products free of formaldehyde and methylene glycol.<\/p>\n<\/div>\n<div style=\"border:1px solid #e3e8ef;border-radius:10px;padding:16px;margin-bottom:12px\">\n<p style=\"color:#013366;font-weight:600;margin:0 0 6px\">Does keratin damage your hair or make you lose it?<\/p>\n<p style=\"color:#2e3033;margin:0\">High-quality treatments with the right aftercare do not damage the hair permanently. Heat of around 200 to 230 degrees can cause hair breakage, but not true hair loss from the root. In rare cases, the stress can trigger a temporary, reversible telogen effluvium.<\/p>\n<\/div>\n<div style=\"border:1px solid #e3e8ef;border-radius:10px;padding:16px;margin-bottom:12px\">\n<p style=\"color:#013366;font-weight:600;margin:0 0 6px\">Which shampoo should you use after a keratin treatment?<\/p>\n<p style=\"color:#2e3033;margin:0\">A sulphate-free and salt-free shampoo. On the ingredient list, avoid Sodium Lauryl Sulfate, Sodium Laureth Sulfate and Sodium Chloride. Chlorinated and salt water at the pool or the sea also shorten the effect and should be avoided or protected against with a leave-in.<\/p>\n<\/div>\n<div style=\"border:1px solid #e3e8ef;border-radius:10px;padding:16px;margin-bottom:12px\">\n<p style=\"color:#013366;font-weight:600;margin:0 0 6px\">What is the difference between a keratin treatment and keratin smoothing?<\/p>\n<p style=\"color:#2e3033;margin:0\">A keratin treatment is a care product for home or salon, works temporarily, barely smooths and costs approx. &pound;5 to &pound;30. Keratin smoothing is a chemical-thermal seal in a professional salon, lasts 2 to 5 months, costs &pound;150 to &pound;600 and carries a possible formaldehyde risk.<\/p>\n<\/div>\n<div style=\"border:1px solid #e3e8ef;border-radius:10px;padding:16px;margin-bottom:0\">\n<p style=\"color:#013366;font-weight:600;margin:0 0 6px\">Can you do keratin at home yourself?<\/p>\n<p style=\"color:#2e3033;margin:0\">Simple conditioning treatments from the chemist are well suited to home use. Keratin smoothing is possible with DIY kits, but it turns out weaker than at the salon, the heat is harder to control and the formaldehyde-free claim is hard to verify. For frizzy or coarse hair, the salon is safer.<\/p>\n<\/div>\n<\/div>\n\n\n\n<h2 id=\"h-sources\" class=\"wp-block-heading\">Sources<\/h2>\n\n\n\n<div style=\"font-size:14px;color:#2e3033;line-height:1.7\">\n<ul style=\"padding-left:20px;margin:0 0 14px\">\n<li>IARC, Monographs Volume 100F (2012): formaldehyde as a Group 1 carcinogen. <a href=\"https:\/\/ehp.niehs.nih.gov\/doi\/10.1289\/ehp.7542\" target=\"_blank\" rel=\"noopener\">ehp.niehs.nih.gov<\/a><\/li>\n<li>ECHA \/ Formacare: formaldehyde CLP classification Carc. 1B. <a href=\"https:\/\/www.formacare.eu\/about-formaldehyde\/regulatory-status\/clp\/\" target=\"_blank\" rel=\"noopener\">formacare.eu<\/a><\/li>\n<li>Regulation (EU) 2022\/1181 (mandatory &#8220;releases formaldehyde&#8221; labelling). <a href=\"https:\/\/eur-lex.europa.eu\/legal-content\/DE\/TXT\/?uri=uriserv:OJ.L_.2022.184.01.0003.01.DEU\" target=\"_blank\" rel=\"noopener\">eur-lex.europa.eu<\/a><\/li>\n<li>BfR, press release 16\/2010: hair-smoothing products containing formaldehyde. <a href=\"https:\/\/www.bfr.bund.de\/presseinformation\/haarglaettungsmittel-mit-formaldehyd-sind-gesundheitsschaedlich\/\" target=\"_blank\" rel=\"noopener\">bfr.bund.de<\/a><\/li>\n<li>OSHA: Formaldehyde in hair products, worker health. <a href=\"https:\/\/www.osha.gov\/hair-salons\/worker-health\" target=\"_blank\" rel=\"noopener\">osha.gov<\/a><\/li>\n<li>Malinauskyte et al. (2020), Int. J. Cosmet. Sci.: penetration of hydrolysed keratin. <a href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC7820954\/\" target=\"_blank\" rel=\"noopener\">pmc.ncbi.nlm.nih.gov<\/a><\/li>\n<li>Fan et al. (2025), Molecules: hydrolysed keratin against hair photoageing. <a href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/40076404\/\" target=\"_blank\" rel=\"noopener\">pubmed.ncbi.nlm.nih.gov<\/a><\/li>\n<li>Keratin.com: chemical components of hair. <a href=\"https:\/\/www.keratin.com\/hair-biology\/what-are-the-chemical-components-of-hair\/\" target=\"_blank\" rel=\"noopener\">keratin.com<\/a><\/li>\n<\/ul>\n<p style=\"font-size:13px;color:#62708a;margin:0\">Note: this guide is for general information about cosmetic hair care and does not replace individual medical or dermatological advice. If you experience skin reactions, allergies or unexplained hair loss, please consult a qualified professional.<\/p>\n<\/div>\n\n\n\n<script type=\"application\/ld+json\">\n{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[\n{\"@type\":\"Question\",\"name\":\"Is keratin good for your hair?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"For the hair surface, yes: keratin fills in gaps in the scale layer, reduces frizz and adds shine. The effect is cosmetic and temporary, not a biological cure. Frizzy and stressed hair benefits clearly, while fine hair should be dosed carefully, as it can end up looking weighed down.\"}},\n{\"@type\":\"Question\",\"name\":\"How long does keratin smoothing last?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"A classic keratin treatment lasts about 3 to 6 months, a Brazilian Blowout around 2 to 3 months (8 to 12 weeks). 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With [&hellip;]<\/p>\n","protected":false},"author":10,"featured_media":95970,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_yoast_wpseo_meta-robots-noindex":"","_yoast_wpseo_meta-robots-nofollow":"","_yoast_wpseo_meta-robots-adv":"","_yoast_wpseo_canonical":"https:\/\/elithair.com\/uk\/blog\/keratin-for-hair\/","_yoast_wpseo_opengraph-title":"","_yoast_wpseo_opengraph-description":"","_yoast_wpseo_opengraph-image":"","_yoast_wpseo_twitter-title":"","_yoast_wpseo_twitter-description":"","_yoast_wpseo_twitter-image":"","_hm_hreflang_map":{"de":105972,"en":96670,"es":91664,"fr":44406,"it":107450,"pt":89508,"tr":82976,"uk":95971,"x_default":96670},"_hm_language_code":"uk","footnotes":""},"categories":[18],"tags":[],"class_list":["post-95971","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog-hair-loss"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v28.0 (Yoast SEO v28.0) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Keratin for Hair: what it does, treatment, care, smoothing &amp; 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