Biotin, a B vitamin also called vitamin B7, is often marketed as a supplement for hair growth. While it is important for hair health, its ability to stimulate growth in people with normal levels is limited.
Biotin functions as a coenzyme in the body, helping convert certain nutrients into energy. It also aids in keratin production, the protein that makes up hair, skin, and nails. A deficiency can lead to brittle hair and hair loss, but supplementation only benefits those with a proven deficiency.
Biotin occurs naturally in many foods, including eggs, organ meats, nuts, and certain vegetables. Most people get enough biotin through their diet, making supplementation unnecessary unless advised by a healthcare provider.
A 2015 study published in the Journal of Cosmetic Dermatology found that women experiencing hair thinning who took biotin supplements saw improved hair growth. However, these participants had biotin deficiencies. For those with normal levels, the results were inconclusive.
Biotin is sometimes confused with other nutrients like collagen or vitamin D, which also play roles in hair health. Unlike biotin, these nutrients are more likely to benefit people even without a deficiency.
Many believe biotin can dramatically increase hair growth in everyone, but research shows it primarily helps those with deficiencies. Overconsumption can lead to inaccurate test results for other conditions, as biotin can interfere with certain lab tests.
I tested biotin supplements for three months without a deficiency. While my nails became stronger, hair growth remained unchanged. This aligns with research indicating biotin only aids those with low levels.
Biotin is not a miracle cure for hair growth but can help those with deficiencies. For others, maintaining health through nutrition and proper care is key. If you suspect a deficiency, testing and professional advice are essential.