Absorption/utilisation of calcium and phosphorus Acid-base metabolism Amino acid synthesis Blood clotting Blood formation Blood sugar levels Blood vessels Bones Calcium levels Carbohydrate metabolism Cartilage Cell division Cell specialisation Cognitive function Connective tissue Cysteine synthesis Digestive enzymes DNA synthesis Electrolyte balance Energy metabolism Fat metabolism Fatty acid metabolism Fertility Gums Hair Hair pigmentation Heart function Homocysteine metabolism Hormonal activity Immune system Iron absorption Iron metabolism Iron transport Jet lag Liver function Macronutrients Mental performance Metabolism of macronutrients Metabolism of sulphur-containing amino acids Mucous membrane Muscle function Nails Nerve cells Nervous system Oxidative stress Oxygen transport Pregnancy Protein and glycogen metabolism Protein synthesis Psychological function Red blood cells Regeneration of vitamin E Skin Skin pigmentation Sleep onset time Sperm production Steroid hormones and neurotransmitters Teeth Testosterone levels Thyroid Tiredness and fatigue Tooth mineralization Vision Vitamin A metabolism