Best collagen for hair and nails.

How to choose collagen for hair and nails

Evidence for collagen and hair is weak — mostly small studies. One small trial found specific collagen peptides reduced brittle nails. Many hair-and-nail products add biotin, which only clearly helps people who are deficient (rare).

Note: high-dose biotin can distort some lab tests, including thyroid and heart tests. Tell your doctor if you take it.

Frequently asked questions

Does collagen help hair grow?

There is little good evidence. Hair loss has many causes; see a doctor or dermatologist if it is sudden or heavy.

Is biotin with collagen worth it?

Only if you are deficient, which is uncommon. High doses can interfere with some blood tests.

General information, not medical advice. Check with your doctor before starting a supplement. As an Amazon Associate we earn from qualifying purchases.