This Popular Supplement May Interfere With Cancer Treatment, Scientists Warn

Experts warn that biotin supplements, often taken for hair growth, have little proven benefit but can distort important lab tests.

A study in JCO Oncology Practice says biotin may interfere with hormone and cancer monitoring, including PSA and TSH tests.

That interference could mislead doctors and affect care for patients with prostate, thyroid, ovarian, and breast cancer.

Patients using biotin for treatment-related hair loss should tell their care team before blood tests.