Biotin also known as Vitamin H or Vitamin B7 is one of the water soluble B complex vitamins that help body convert food into energy. Biotin is an important component of enzymes in the body that break down fats, carbohydrates and proteins. Biotin keeps the brain, nervous system, eyes, liver, skin healthy. Biotin helps stimulate hair growth, causing hair to thicken and appear more lustrous. Biotin is known for its ability to strengthen nails.