Prophylaxis consists of periodic administration of Vitamin A supplements. Retinol is in the vitamin A family. Night blindness is one of the first signs of vitamin A deficiency. This can help children suffering from Vitamin A deficiency. Keratomalacia is an eye disorder that results from vitamin A deficiency. A carotenoids to meet their vitamin A requirements. This allows for toxic levels of vitamin A to accumulate. Glycoprotein synthesis requires adequate vitamin A status. The amount of stored vitamin A decreases progressively in liver injury. The pump consists of a single protein bound to a Vitamin A derivative, retinal. A report found HA content increases in the presence of retinoic acid (vitamin A). Unagi is high in protein, vitamin A, and calcium. It contains lots of vitamin A and calcium as well. This campaign took place together with the vaccination against polio and vitamin A supplementation. Various studies have been conducted testing the effective of vitamin A supplementation on dark adaptation.