Biotin supplements are often promoted to improve hair growth, strength, or sheen -- possibly because biotin deficiency can cause symptoms such as dry, thinning hair and loss of hair color. However, biotin deficiency is quite rare -- the recommended daily intake of biotin
is easily obtained from food
, and there is no evidence biotin improves the growth or texture of hair in people who are not deficient.
Preliminary evidence that biotin supplementation may strengthen brittle nails
Be aware that biotin, especially taken at high doses, can interfere with certain medications and laboratory tests.
For details, see the Biotin section of the B Vitamin Supplements Review, which includes CL's test results of products >>
and CL's Top Pick
among biotin supplements.
Also see these related CL Answers:
Can vitamin supplements strengthen brittle nails? >>
I am female and just purchased a saw palmetto supplement for hair loss. However, it says on the bottle that it is only for use by men. Is it really unsafe for women? Lots of sites suggest its use, but I'm fearful of trying it now. >>
Do any supplements help for hair loss? >>
This CL Answer initially posted on 5/9/2017.
Last updated 7/25/2017.