This combination of vitamins normalizes metabolism, strengthens the body, takes part in regulation of numerous biochemical processes. Also, it prevents hypo-and avitaminosis, especially during seasonal lack of vitamins, and during extreme mental and physical stress. It helps to maintain optimal performance and reduces fatigue. B vitamins (B1, B2, B6) are involved in the metabolism of carbohydrates, proteins and fats, as well as in the nervous system functioning. Vitamin B12 has a high biological activity – it is a growth factor that is necessary for normal hematopoiesis. Vitamin A is essential for the development of epithelial cells and the synthesis of rhodopsin. Vitamin D3 promotes calcium absorption and ensures correct mineralization of bone tissues and teeth. Vitamin C accelerates the absorption of iron and is involved in redox processes in the body, regulates carbohydrate metabolism, blood coagulation, tissue regeneration. Vitamin E is a physiological antioxidant that protects cell membranes from destruction, and maintains their functional properties. Biotin supports metabolism of carbohydrates and enhances the energy consumption process. It regulates blood sugar level, which is essential for preventing diabetes. Biotin is also considered as "beauty vitamin". It affects the structure of the hair, preventing cross-section, breakage and loss, as well as the appearance of the skin, protecting it from dermatitis, dryness and flaking. Biotin protects the nail plate from exfoliation, growth and structure disorders.