Thiamin helps in the proper functioning of the heart and nervous system. Vitamin C supports the proper production of collagen in order to ensure the proper function of the skin. Vitamin D helps maintain healthy bones and teeth, helps to maintain the proper level of calcium in the blood. Vitamin B6 and B12 help in the proper functioning of the immune system and contribute to the reduction of tiredness and weariness. Niacin helps maintain healthy skin and the proper condition of the mucous membranes.