Biotin for Nails: What the Evidence Can—and Can’t—Tell Us

Biotin is widely promoted for stronger nails, but marketing confidence is greater than the clinical evidence for routine use in healthy people.

Why biotin is associated with nails

Biotin is an essential nutrient involved in normal metabolism. True deficiency can cause symptoms, but deficiency is not the default explanation for every brittle or peeling nail.

Evidence for brittle nails

Small studies have reported improvements in some people with brittle nails, but the evidence base has important limitations and does not establish that everyone benefits from high-dose supplementation.

Important safety point

High biotin intake from supplements can interfere with certain laboratory tests. Tell healthcare professionals about supplements you take, especially before blood testing.

Next: vitamins for nails · nail supplement guide.