What are some things that vitamin a does in our body?

Skin, membranes,more: Vitamin a, a fat-soluble vitamin, important for healthy teeth, bones, skin, mucous membranes. 2 forms, retinol, yellow pigment in animal foods (butter, eggs, cheese); carotenes, orange pigment in plant foods. A deficiency can cause difficulty seeing in low light conditions; increased susceptibility to infections in children + retarded growth.Too much vit a, anorexia, dry skin, insomnia, anemia.