Biotin File

It is effective for treating rare biotinidase deficiencies or conditions like "uncombable hair syndrome".

The FDA has warned that high biotin doses can interfere with critical blood tests, including those for heart attacks (troponin), thyroid function, and pregnancy. User Experience Summary A Review of the Use of Biotin for Hair Loss - PMC biotin

Most researchers conclude that the widespread use of biotin for general hair growth is not supported by robust clinical trials. It is effective for treating rare biotinidase deficiencies

Scientific reviews indicate that biotin is highly effective for those with a deficiency, but there is little clinical proof that it improves hair or nail health in healthy individuals. including those for heart attacks (troponin)