Indications
Keratin is the main structural protein of hair, nails and the outer layer of the skin. As a dietary supplement, usually in capsules or tablets and often combined with biotin, other B vitamins, zinc or amino acids, it is used to support hair strength and growth, reduce hair breakage and help brittle nails. Evidence for these benefits is limited and comes mainly from small studies. It does not treat hair loss caused by medical conditions such as thyroid disease, iron deficiency, hormonal problems or alopecia.
How It Works
Supplement keratin is usually a processed (hydrolysed or solubilised) form from sheep wool or animal sources. It provides amino acids, especially the sulphur-containing amino acid cysteine, that the body uses to build its own keratin. Added biotin and other nutrients support the enzymes involved in hair and nail growth. Visible changes, if any, usually take at least two to three months, as hair and nails grow slowly.
Dosage and Administration
Take as directed on the label, usually with a meal and a glass of water. Do not take more than the label amount. Not for children unless a doctor advises it.
Interactions
No important interactions are known for keratin itself. If the product contains biotin, high doses can interfere with some blood tests (for example thyroid and heart tests), giving falsely high or low results; tell your doctor and the laboratory that you take it, and stop it a few days before tests if advised. Tell your doctor or pharmacist about all medicines and supplements you use.
Contraindications
- Known allergy to keratin, wool, or any other ingredient in the product.
- Strict vegetarian or vegan diets, as most keratin is from animal sources (check the label).
Side Effects
Keratin supplements are usually well tolerated. Possible side effects include mild stomach upset, bloating, nausea and, rarely, skin rash or acne-like spots (sometimes linked to high-dose biotin).
Get urgent medical help if you notice swelling of the face, lips or throat, difficulty breathing or a widespread itchy rash.
Pregnancy and Lactation
There is not enough safety information on keratin supplements during pregnancy or breastfeeding. Use them only after advice from a doctor, who may prefer a standard prenatal vitamin.
Precautions and Warnings
See a doctor if hair loss is sudden, patchy or heavy, or comes with tiredness, weight change or irregular periods, as it may have a medical cause that needs testing. Check whether your other supplements also contain biotin or the same vitamins to avoid taking too much. People with kidney disease should talk to a doctor before taking protein or amino acid supplements.
Overdose
Taking much more than the label amount is unlikely to be dangerous but may cause stomach upset. Seek medical advice if a large amount has been swallowed, especially by a child.
Therapeutic Class
Dietary supplement (hair and nail protein).
Storage
Store below 30°C in a dry place, away from light and out of the reach of children. Keep the container tightly closed.
Prepared by the Oshud Alo team from standard drug references. For information only; always follow your doctor's advice.