Why Your Biotin Hair Supplement Could Be Interfering With Cancer Treatment

When facing cancer treatment, losing your hair can feel like a devastating blow to your identity. It’s understandable that many patients search for solutions to restore their hair as quickly as possible. One popular option that has gained widespread attention is biotin, a vitamin often marketed for stronger hair and nails. But cancer doctors are now raising red flags about this seemingly harmless supplement, warning that it may quietly disrupt cancer care in ways most patients never expect.

The Hidden Danger of a Popular Vitamin

Biotin, also known as vitamin B7, is found naturally in many foods including fruits, vegetables, meats, eggs, and dairy products. The body uses it to produce proteins like keratin, which helps support healthy hair, skin, and nails. However, true biotin deficiency is quite rare in the general population because most people get enough through their regular diet.

Despite this, many cancer patients turn to biotin supplements hoping to regrow hair lost during chemotherapy or other treatments. The problem, according to Brittany Dulmage, MD, an oncodermatologist at The Ohio State University Comprehensive Cancer Center, is that these supplements carry risks that are often overlooked.

“People have the misconception that biotin supplements are harmless and there’s no reason not to take them,” Dulmage said. “The reality is that the supplements may cause inaccurate lab results, resulting in a delay or change in patients’ treatment plans.”

Dr. Dulmage serves as associate director of dermatology at The Ohio State University College of Medicine and leads the Oncodermatology Clinic, where patients receive specialized care for hair, skin, and nail side effects caused by treatments such as chemotherapy, immunotherapy, or targeted therapy. She has seen this issue firsthand with countless patients.

How Many Cancer Patients Are Taking Biotin Without Knowing the Risks?

The numbers are striking. According to Dulmage, more than half of the patients who come to see her about hair loss are already taking a supplement they started on their own. Many learned about biotin online, heard about it from friends or family, or were even advised to try it by their own doctors who may not have been aware of the potential interference.

To bring more attention to this problem, Dulmage authored a paper in the journal JCO Oncology Practice. In it, she urges oncologists to have open conversations with patients about hair loss and to clearly explain how biotin can affect medical test results.

The Science Behind Biotin’s Interference With Blood Tests

Here is where things get serious. Biotin can interfere with certain blood tests that doctors use to monitor cancers, including prostate, thyroid, ovarian, and breast cancers. These tests rely on chemical reactions that involve biotin. When you take supplements, the extra biotin in your system can cause test results to appear higher or lower than they actually are.

“Biotin does not actually change the levels of hormones in the body, but it interferes with the way those levels could be checked when blood work is done,” Dulmage explained.

This interference can lead to dangerous mistakes. For example, biotin may falsely lower levels of prostate specific antigen (PSA) or thyroid stimulating hormone (TSH). This could potentially mask a cancer recurrence in survivors, meaning doctors might miss signs that the cancer has returned. On the flip side, for reproductive hormones including estrogen and testosterone, biotin may falsely elevate levels, which could result in delayed or inappropriate therapy.

Even more concerning, biotin can also affect levels of troponin, a marker doctors use to determine whether someone is having a heart attack. Since heart attacks are not planned events, patients cannot simply stop taking biotin before this test.

A Real Patient’s Experience: Inconsistent Lab Results

Anna Malagoli of Columbus, Ohio, knows these risks all too well. Like many cancer patients, she worried deeply about losing her hair during breast cancer treatment.

“Your hair is very much a part of you. One of the first things you ask is ‘Am I going to lose my hair?’ It’s such an important thing for people — not everybody looks good with no hair,” she said.

After her cancer went into remission, Malagoli wanted to restore her long curly hair. She began taking biotin supplements after reading about them online. She took large amounts, believing it would help her hair grow back faster.

“The amount of information on the Internet can lead you in different directions. I was taking so much biotin it’s not even funny,” she said. “Nobody mentioned one word that biotin vitamins or minerals or supplements could interfere with your treatment or your testing.”

Malagoli only learned about the potential problems during a visit with Dr. Dulmage. Looking back, she realized the explanation fit perfectly with what she had been experiencing.

“My lab results were inconsistent. They just didn’t balance out with what I was feeling so that was a red flag. I think it had to do with the supplements I was taking,” she said.

What Experts Recommend Instead of Biotin

For patients who choose to keep using biotin despite these warnings, Dulmage advises stopping it at least 72 hours before scheduled blood tests. However, she acknowledges this is not always possible.

“The challenge is that not all blood work is planned so you may not be able to hold your biotin,” she said. “This is why I recommend to patients — think about not taking it at all, especially since very few people are biotin deficient.”

So what can cancer patients do if they want to address hair loss safely? Dulmage suggests using minoxidil instead. This treatment is FDA approved, widely available over the counter, and comes in topical forms such as lotions and foams. It is considered safe and effective for most people, though it is not recommended during pregnancy or breastfeeding.

“If you have been trying minoxidil for several months and not seeing any improvement or want to know about other options, see a dermatologist. There are many other types of treatments that may be an option,” she said.

Malagoli has tried both approaches and found that minoxidil worked better for her.

“I don’t know if my body just doesn’t assimilate the supplements as well, but minoxidil is definitely more effective long-term,” she said. “I would say it’s super important to listen to your doctors and not just do your thing.”

Practical Takeaways for Cancer Patients and Survivors

If you or a loved one is undergoing cancer treatment or is in remission, here are key points to keep in mind:

• Always talk to your oncologist before starting any new supplement, including vitamins like biotin
• Be aware that natural or over-the-counter does not mean risk-free, especially during cancer care
• If you take biotin, inform your doctor so they can account for potential lab test interference
• Consider stopping biotin at least 72 hours before any scheduled blood work
• Ask about safer alternatives like minoxidil for hair loss concerns
• Remember that most people get enough biotin from their regular diet and do not need supplements

The bottom line is simple: while the desire to restore your hair during or after cancer treatment is completely understandable, not all solutions are created equal. What seems like a harmless vitamin could actually be putting your health monitoring at risk. Always prioritize open communication with your healthcare team over information you find online, and never assume that a supplement is safe just because it is popular. Your treatment plan depends on accurate lab results, and protecting that accuracy should be a top priority.

Source: ScienceDaily