Does Biotin Cause Weight Gain?

Many people take biotin supplements to promote healthy hair, skin, and nails. However, there have been concerns that biotin may contribute to weight gain. Let's unpack the potential link between biotin and weight gain, and whether or not there is any scientific evidence to support these claims. Stay tuned to learn more about the effects of biotin on body weight.

What is Biotin?

Biotin, also known as vitamin b7 or vitamin H, is a water-soluble nutrient that is critical to converting food into energy and helps maintain healthy hair, skin, and nails. Biotin can be found in foods like eggs, nuts, and leafy greens, but can also be taken as a supplement. Deficiency in vitamin b7 can lead to symptoms like hair loss, brittle nails, and skin rashes. Incorporating biotin-rich foods or supplements into your routine can help support overall health and well-being.

Primary Benefits of Biotin

Biotin, also known as vitamin B7 or vitamin H, offers a range of benefits for overall health, particularly for hair and nail health. Here are some of the primary benefits of biotin supplementation:

  1. Promotes Hair Growth: Biotin is often associated with fostering hair growth and improving the overall health of hair follicles. Adequate levels of biotin in the body are essential for maintaining healthy hair, and biotin supplements may help support individuals experiencing thinning hair or hair loss.

  2. Supports Hair and Nail Health: Biotin is essential to maintaining healthy hair and nails. The vitamin helps produce keratin, a protein that forms the structural foundation of hair and nails. By ensuring sufficient biotin intake, individuals may notice improvements in the strength, thickness, and overall appearance of their hair and nails.

  3. Addresses Thinning Hair: Thinning hair is a common concern for many individuals, and biotin supplementation is often recommended as part of a comprehensive approach to addressing this issue. Biotin helps strengthen hair follicles and may promote thicker, fuller hair growth over time.

  4. May Reduce Hair Loss: While the causes of hair loss can vary, inadequate levels of biotin in the body may contribute to hair shedding and thinning. By supplementing with biotin, individuals may help address deficiencies and reduce the risk of hair loss associated with biotin insufficiency.

While biotin is a critical nutrient, more evidence is needed to solidify these beauty-related benefits. However, if you are low on biotin, incorporating biotin supplements into your daily routine can be a proactive step towards supporting healthy hair growth, addressing hair loss concerns, and enhancing the overall health and appearance of your hair and nails

Can Biotin Cause Weight Gain?

man standing on a scale

In short, no studies demonstrate a direct link between biotin and weight gain. However, some animal studies suggest that biotin deficiency may affect blood sugar regulation. It is important to note that biotin is a B vitamin critically involved in metabolism and energy production in the body. While biotin deficiency can potentially lead individuals to gain weight by causing a slowdown in metabolism, there is no evidence to suggest that taking biotin supplements can directly cause fat accumulation or weight gain. 

Possible Side Effects of Biotin Supplements

While biotin is generally considered safe as a supplement when taken at recommended doses, there are some potential side effects to be aware of.

Interference with Lab Results

Biotin supplements can interfere with certain lab tests, particularly those that rely on biotin-streptavidin interaction, such as thyroid function tests and hormone assays. This interference can lead to inaccurate results, potentially affecting medical diagnoses and treatments. It's important to inform healthcare providers if you're taking biotin supplements before undergoing any laboratory tests.

It is always best to consult with a healthcare professional if you have any questions or concerns about supplementation to ensure it is safe and appropriate for your individual needs.


In rare cases, some individuals may experience allergic reactions to biotin supplements, resulting in rashes or hives on the skin. If you notice any unusual skin reactions after taking biotin, discontinue use and consult a healthcare professional.


There have been anecdotal reports of biotin supplementation causing or exacerbating acne in some individuals. While scientific evidence is limited, some people may experience acne breakouts as a side effect of biotin supplementation. If you're prone to acne, it's advisable to monitor your skin closely while taking biotin supplements and consult a dermatologist if any issues arise.

How to Take Biotin

Taking biotin supplements can help support healthy hair, skin, and nails, but it's essential to use them correctly for optimal results. Here are some tips on how to take biotin effectively:

  1. Follow Recommended Dosage: Biotin supplements are available in various strengths, typically ranging from 1,000 to 10,000 micrograms (mcg) per dose. It's important to follow the recommended dosage provided on the supplement label or as directed by your healthcare provider. Taking more than the recommended amount may not necessarily provide additional benefits and could increase the risk of side effects.

  2. Choose the Right Form: Biotin supplements come in different forms, including capsules, tablets, gummies, and liquid drops. Select a form that's convenient for you to take and that fits your lifestyle. If you have difficulty swallowing pills, for example, you may prefer a chewable or liquid form of biotin.

  3. Take with Food: Biotin supplements can generally be taken with or without food. However, some people may experience mild stomach upset when taking biotin on an empty stomach. If you find that biotin bothers your stomach, try taking it with a meal or snack.

  4. Be Consistent: To experience the full benefits of biotin supplementation, it's essential to take it consistently as directed. Incorporate it into your daily routine, whether it's with breakfast, lunch, or dinner, to help ensure you don't forget to take it.

  5. Be Patient: It may take a few weeks to months to notice significant improvements in hair, skin, or nail health after starting biotin supplementation. Be patient and consistent with your use, and remember that individual results may vary.

  6. Consult a Healthcare Professional: Before starting biotin supplementation, especially if you have any underlying health conditions or are pregnant or breastfeeding, it's crucial to consult with a healthcare professional. They can provide personalized advice based on your specific needs and help ensure safe and effective use of biotin supplements.

By following these guidelines, you can maximize the benefits of biotin supplementation and support your overall health and well-being.

In Conclusion

Research on whether biotin causes weight gain is inconclusive. While some studies suggest that biotin may play a role in metabolism and energy production, there is no direct evidence linking it to weight gain. It is important to remember that biotin is a water-soluble vitamin, which means any excess is excreted through urine.