Biotin (Vitamin B7) is a popular supplement primarily marketed for strengthening hair and nails. While many users report positive aesthetic changes, scientific evidence suggests its benefits are mostly limited to individuals with an actual biotin deficiency.
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
It is effective for treating rare biotinidase deficiencies or conditions like "uncombable hair syndrome". Biotin (Vitamin B7) is a popular supplement primarily
Most researchers conclude that the widespread use of biotin for general hair growth is not supported by robust clinical trials. including those for heart attacks (troponin)