Biotin, also known as Vitamin H or B7, is a water-soluble B-vitamin involved in a wide range of metabolic processes, primarily related to the breaking down of fats, carbohydrates, and amino acids. Water-soluble vitamins are not stored in the body, so a daily intake is necessary to avoid deficiencies. Biotin deficiency may cause hair thinning, skin issues & fatigue. Brittle nails, skin irritations, hair loss, are common symptoms of Biotin deficiency and can be treated by supplementation.