Is keratin good for hair?

What keratin treatments actually do

There are three different things in the keratin category and they work in completely different ways. Each one deserves a clear look before you spend money on any of them.

Salon keratin treatments are not just keratin

When people talk about a 'keratin treatment' they usually mean a smoothing service that costs a few hundred pounds and leaves hair sleek and straight for three to six months. The active ingredient is rarely keratin alone. The smoothing effect comes from formaldehyde or methylene glycol which release formaldehyde when heated. These chemicals break and reform the disulphide bonds inside the hair. The keratin in the formula is largely supporting cast not the main act.

Repeated treatments cause damage

Done well a single keratin treatment looks impressive. Frizzy hair becomes manageable. Curly hair becomes wavy. Wavy hair becomes straight. Done repeatedly though the damage adds up. Hair becomes thinner, drier and weaker over time. Some women lose significant length after multiple treatments. The bonds that were broken to make the hair straight do not fully recover and the cuticle damage from the high heat applied during the treatment is cumulative.

The formaldehyde safety concern

Formaldehyde is a known carcinogen and respiratory irritant. The Health and Safety Executive in the UK has flagged Brazilian-style keratin treatments as a workplace health concern for salon staff. Many countries have restricted or banned formulations above certain formaldehyde concentrations. Newer 'formaldehyde-free' treatments exist but some use methylene glycol or glyoxylic acid which release similar compounds when heated. Ask about the active ingredients before booking.

Keratin shampoos and conditioners are mostly marketing

Hydrolysed keratin in a shampoo or conditioner sits on the outside of the hair and provides mild temporary smoothing. The protein cannot meaningfully repair structural damage. The effect washes out quickly. That is not to say they are useless. As decent conditioners they do what other decent conditioners do. The keratin angle just does not justify the elevated price tag. Plain good-quality conditioner often performs just as well at a fraction of the cost.

Keratin supplements miss how digestion works

Oral keratin supplements have become a popular addition to the hair supplement aisle. The marketing pitch is that you eat keratin and your body uses it to build new keratin in hair. The reality is that any protein you eat is broken down to amino acids during digestion. Your body then assembles those amino acids into whatever proteins it needs including keratin. Specific keratin supplements offer nothing over ordinary protein plus the cofactors your body uses to build keratin.

What actually helps versus what is marketing

Sorting through the keratin category gets easier when you separate what works mechanically from what is repackaged marketing.

Skip the keratin supplements

Adequate dietary protein covers what your body needs to build keratin. A balanced diet with red meat, eggs, fish, beans and dairy delivers all the amino acids required. Plant-based eaters need slightly more attention to protein variety but still do not need keratin specifically. Save the money for things that actually help.

Treat keratin shampoos as ordinary conditioners

If a keratin shampoo or conditioner works for you, keep using it as you would any other decent product. Just do not expect special results from the keratin part. The conditioning ingredients in the formula are doing the work. Premium price tags for keratin marketing are rarely worth paying.

Space out salon keratin treatments

If you love what salon keratin does for your frizz, leave at least six months between treatments. The damage accumulates. Hair that has been keratin-treated repeatedly becomes increasingly fragile. Six months minimum lets some recovery happen between sessions. A year is even better.

Ask about ingredients before booking

Look up the specific brand and product your salon uses. If it contains formaldehyde, methylene glycol or glyoxylic acid be aware of the safety considerations. Salon staff doing these treatments daily need proper ventilation and PPE. The treatment is more aggressive than most salon services and worth understanding before committing.

Consider bond builders as an alternative

Olaplex and similar bond builders address the same disulphide bonds that keratin treatments aim at but without the formaldehyde and high heat. The smoothing effect is gentler and less dramatic. The hair quality improvements are more sustainable. For most adults bond builders deliver more long-term benefit than repeated keratin treatments.

Keratin supplements are marketing. Your body builds keratin from amino acids and supporting nutrients. Our Hair, Skin and Nails Gummies deliver the cofactors your body actually uses for keratin production in a convenient daily format.

When to see your GP about hair loss

Keratin treatments warrant some caution. See your GP if any of the following apply.

• Respiratory symptoms after a salon keratin treatment. Formaldehyde exposure can affect breathing.
• Severe scalp irritation or burning during a treatment. Stop and reassess.
• Significant hair loss after repeated keratin treatments. May reflect cumulative damage.
• Allergic reactions to ingredients in the treatment.
• Pregnancy. Avoid formaldehyde-containing treatments during pregnancy.

Single salon keratin treatments are generally safe for healthy adults outside pregnancy with proper salon ventilation. Repeated treatments produce cumulative damage worth considering before booking again. Hair-loss concerns warrant proper assessment regardless of how much keratin has been on the hair.

More on hair structure and treatments

Keratin connects to chemical treatments and supplements. Can dying hair cause baldness? covers another chemical treatment. Can biotin grow hair? covers the supplement most often paired with keratin claims. And Does hairspray damage hair? covers more on cosmetic damage versus actual loss.