Biotin is a water-soluble micronutrient found in foods such as nuts, seeds, avocados, fish, chicken, and dairy. It is a B-vitamin that is known by many names, including vitamin B7, vitamin H, and biotin (15). Biotin is also produced by certain strains of probiotic bacteria, so if you have a healthy gut microbiome, your body will naturally get some biotin from them (16). Biotin supplements are a great way to combat biotin deficiency. Make sure to buy them from a reputable supplement manufacturer to get 100% organic and natural vitamin B7 supplement.