Vitamin K is required for the biosynthesis of some proteins found in plasma, bone and kidneys. Vitamin D is a fat-soluble vitamin. Our bodies produce it when exposed to sunlight. Vitamin D regulates blood levels of calcium within normal limits. It aids the intestines in absorption of calcium and phosphorus.
Most foods have little or no vitamin D, and few foods are fortified with it.
However, our bodies can produce it with exposure to sunlight. Vitamin C is a popular vitamin, which is widely used because of its anti-oxidant effects. Vitamin C helps form the protein collagen, keeps capillary walls and blood vessels firm, aids with the absorption of iron, improves your immune system and several other vital functions. Vitamin B12 is a water-soluble vitamin that we need to produce normal red blood cells, prevent megaloblastic anemia, synthesize RNA and DNA, promote normal growth in children, use fat and proteins from foods effectively and prevent homocysteine accumulation. Vitamin A is a fat-soluble vitamin needed to maintain skin and tissue linings, vision and eye structure, help resist infection, develop bones properly, form sperm and pregnancy maintenance.