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Biotin can help hair only when hair loss is caused by biotin deficiency, which is rare. There is not good evidence that it grows hair in people with normal biotin levels.

No toxic symptoms of biotin are known, but 5,000 mcg is far above the roughly 30 mcg adults need, and the NHS says there is not enough evidence about daily doses above 0.9 mg. Take it only if your doctor advises it.

Biotin has no known toxic symptoms, and side effects are the same for men and women. The bigger issue is that it can interfere with certain lab tests, so tell your doctor before any blood test.

Yes, it can interfere with certain lab tests. For example, biotin can make a troponin test for heart attack look lower than it really is. Tell the doctor ordering any test that you take biotin.