It can be distributed into two classes' fat soluble and water soluble and further divided in to many categories.
The first class contains vitamin A, D, E, K, the second contain vitamin D, C along with many quasi-vitamin.
The human body itself cannot produce vitamin but can acquire them from food. Vitamins required by the body everyday is minimum but lack of it may cause physiological and pathological changes in human cells, resulting in avitaminosis
Many studies discover that Ca is closely related to many cellular activities, including muscle extracting and contraction, cytoplasm flow, ciliate movement, multiple-ion permeability by regulating membranes, hormone secretion, fertilization, cell division regulation, enzyme activity, neurotransmitters release and DNA synthesis.