Biotin or vitamin B7 as it is also known, is one the B complex vitamins that help convert food into energy for the body. It is commonly used to alleviate hair loss and improve hair health, increase the durability of nails, and help maintain healthy skin. There are promising scientific studies that suggest that biotin supplementation can help improve hair, skin, and nail health. A recent study in 2017 found that clinical trials have shown an improvement in firmness, hardness, and thickness of brittle nails with taking biotin. People who have acquired or inherited nail and hair issues have shown to benefit the most from biotin supplementation. Another recent study in 2018 found that Vitamin B7 is often prescribed by dermatologist because it may aid with acne, fungal infections, rashes, and dryness. However, the researchers correctly point out that more research is needed to understand exactly how biotin helps with hair, skin, and nail health. https://www.ncbi.nlm.nih.gov/pubmed/29057689, https://www.ncbi.nlm.nih.gov/pubmed/29438761
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