Vitamins are organic substances that can be found in natural foods and are necessary for the body's regular development and maintenance.
The body uses vitamins for a number of vital processes, including cellular growth and differentiation, immune system enhancement, wound healing, and antioxidant protection.
As components of coenzymes or their precursors, vitamins, such as vitamin A, are crucial for the functioning of enzymes and are part of biochemical pathways. NAD and NADP both contain niacin as a component.
Vitamin K is necessary for blood clotting, vitamin D controls calcium retention in bones, and vitamin A is a component of rhodopsin.