Biotin treats and prevents biotin deficiency. It is required for cell growth, the production of fatty acids, and the metabolism of fats and amino acids. It also enhances hair growth. Acetylcysteine replenishes the body's stores of glutathione, a chemical that removes toxic substances. Calcium pantothenate is required for the synthesis of many steroid hormones, lipids, neurotransmitters, and hemoglobin. Selenium prevents cell damage and protects the body from the poisonous effects of heavy metals and other harmful substances. Copper works with iron to produce red blood cells. It also helps keep the nerves, blood vessels, bones, and immune system healthy. Zinc oxide provides zinc that is needed for the body's immune system to work properly. It plays a role in growth, wound healing, and maintaining gut health. Zinc is also needed for the senses of taste and smell. Zinc oxide also acts as an antibacterial agent.