Doctors Warn Biotin Supplements May Disrupt Cancer Lab Tests

Medical experts from The Ohio State University Wexner Medical Center warn that biotin supplements, commonly taken by cancer patients to combat hair loss, may dangerously interfere with critical laboratory tests. While marketed for strengthening hair and nails, there is little evidence supporting biotin's efficacy for treatment-related hair loss. More significantly, high doses of biotin can distort blood markers used to monitor cancers such as prostate, thyroid, ovarian, and breast cancer. This interference occurs because many diagnostic assays rely on biotin-based chemical reactions, leading to falsely suppressed or elevated hormone levels. Consequently, this may mask cancer recurrence or delay necessary treatment adjustments. Dr. Brittany Dulmage, an oncodermatologist, highlights that many patients self-prescribe biotin without understanding these risks, often influenced by online information. A case study of a breast cancer survivor illustrates how inconsistent lab results were linked to excessive biotin intake. Experts urge oncologists to discuss hair loss management openly with patients and advise them to disclose all supplement use to ensure accurate diagnostic outcomes and safe care planning.