Vitamin A is absolutely essential for us to view and participate in redox processes. It improves metabolism. Also involved in the building of bone.
Vitamin A plays a huge role in keeping our immune defense. Beta Carotene helps us to fight tumors and helps maintain our T-cells active in the fight against viruses of the affected cells.
T cells is killer immune cells in the body. But they kill all the enemies who infiltrated us. If you came to foreign cells, unless the prosperity of vitamin A is T-cell killing her. It kills because it is activated by using the killing mechanisms. It turns out that it is necessary to launch these mechanisms at the same time it is still necessary for the activation of macrophages, they release the so-called tumor necrosis factor, and it helps a person to fight cancer cells.
We can say that beta-carotene is 2 molecules of retinol. it splits to form retinol in our liver.
If vitamin A is taken for a long time it is necessary to include the use of vitamin E, it promotes its absorption.