Biotin & Cancer Treatment: Why It Won’t Stop Hair Loss & Can Harm Tests

February 12, 2026 Dr. Michael Lee – Health Editor Health

Cancer patients increasingly turning to biotin supplements to combat hair loss related to chemotherapy and radiation treatments may be inadvertently skewing critical lab test results, potentially hindering their care, oncologists are warning.

The popular vitamin, marketed for hair and nail growth, has been found to interfere with laboratory tests used to diagnose and monitor a range of conditions, including cancer. A recent study highlighted in JCO Oncology Practice urges physicians to proactively discuss the potential impact of biotin supplementation with their patients, according to reporting from Ohio State University’s Comprehensive Cancer Center.

While many cancer patients seek biotin as a remedy for treatment-induced alopecia, evidence suggests it rarely provides significant benefit. More concerning, even a single dose of biotin can distort test results, leading to inaccurate diagnoses or mismanaged treatment plans. This interference stems from biotin’s ability to bind to certain laboratory assays, producing falsely high or low readings.

The issue is particularly acute due to the fact that many oncologists are unaware of the extent to which biotin can affect test outcomes. Oncology News Central reported that the potential for interference is not widely recognized within the oncology community, raising concerns about the reliability of diagnostic information.

Targeted Oncology notes that the distorted lab results can have serious consequences, impacting critical decisions regarding cancer treatment. The article published in JCO Oncology Practice emphasizes the need for open communication between oncologists and patients regarding biotin employ and its potential effects on testing.

As of late January 2026, the Food and Drug Administration has not issued specific guidance regarding biotin supplementation and cancer treatment, and no widespread changes to laboratory testing protocols have been implemented. The Ohio State University Comprehensive Cancer Center continues to advocate for increased awareness among healthcare professionals and patients.