Biotin

An indispensable part of hair & nail strengthening supplements, biotin is a water-soluble vitamin also known as vitamin H or B7. In addition to boosting keratins, it helps burn carbohydrates, proteins and fats into energy, and it can be found in egg yolk, bananas, cauliflower, avocados, soy, and grain, and in organ meats such as liver or kidney.