Eyes, skin and hair
Keratin
Also called: keratin supplement
The protein that makes hair and nails.
- Why people take it
- Hair and nails.
- What the evidence says
- Little evidence.
- How it is usually taken
- Usually 500 mg a day of hydrolysed keratin.
- Be careful
- Generally safe.
- Medicines it can interact with
- No important medicine interactions are known, but tell your doctor and pharmacist about every supplement you take.
Other eyes, skin and hair
Common questions
What is Keratin?
The protein that makes hair and nails.
Why do people take Keratin?
Hair and nails.
Does Keratin work?
Little evidence.
How much Keratin do people take?
Usually 500 mg a day of hydrolysed keratin.
Is Keratin safe?
Generally safe.
Does Keratin interact with medicines?
No important medicine interactions are known, but tell your doctor and pharmacist about every supplement you take.
Sources and further reading
Last reviewed 31 October 2026. Written by Satya Babu.
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