Biotin (Vitamins B7, H) is a water-soluble vitamin that plays a vital role in assisting enzymes to break down fats, carbohydrates, and proteins. Biotin regulates cell signaling and gene activity which is necessary for cell development and tissue formation. Biotin is a safe vitamin that the body excretes when in excess. Biotin helps to prevent hair loss and contributes to the maintenance of healthy and strong hair, skin, and nails. Alcohol interferes with biotin absorption. One third of pregnant women show biotin deficiency symptoms and therefor need to take biotin supplements to meet demands during pregnancy. Vitamin C, or ascorbic acid is a water-soluble vitamin. The body cannot store vitamin C in tissues for very long, so it is important to consume it regularly. Vitamin C is a strong antioxidant that fights infections, helps heal wounds and neutralizes free radicals. The body uses it to produce collagen, keeping the skin healthy and supple, as well as hormones and neurotransmitters in the brain. Vitamin C deficiency causes scurvy, fatigue, and anemia. Another benefit of vitamin C is that it helps the body absorb iron from plant-based foods. It is important to administer vitamin C as a supplement because it breaks down during cooking. Smokers also have a high deficiency of vitamin C. Selenium is a chemical element necessary for the functioning of the thyroid gland and DNA synthesis in the human body. The thyroid gland regulates metabolism, helps maintain body weight and body composition. Selenium also protects against oxidative damage and infections. It prevents the inflammatory accumulation of blood cells in the blood vessels, as it prevents the oxidation of fats and therefore can also lower the risk of cardiovascular diseases. Selenium is also a strong antioxidant and prevents cognitive decline and Alzheimer's disease. Selenium also prevents the development of various cancers, namely breast, lung, prostate, stomach, and esophageal cancer.