Vitamin A serves as an important aid for mucous membranes, skin, vision, immune system health, and tooth and bone growth. The amount of vitamin A in plasma or serum is an indicator of the amount of vitamin A and carotenoids ingested and absorbed by the intestines. Vitamin A plays a significant role in retinal function (dark-light adaptation) and is necessary for the growth and differentiation of epithelial tissue. Furthermore, it is required for bone growth, reproduction, and embryonic development. On the other hand, vitamin E assists in preserving cell membranes and contributes to the normal maintenance of bio membranes, the vascular system, and the nervous system. Additionally, it provides antioxidant protection for vitamin A. Deficiency of vitamin E in children can lead to reversible motor and sensory neuropathies.