Retinol
Vitamin A is a fat soluble vitamin necessary for health, deficiency of which can cause disorders of vision, skin, bone and immunity. The recommended daily allowance for vitamin A is 300 to 700 μg for children and approximately 700 to 900 μg for adults, amounts which can be provided by a normal diet. Higher doses of vitamin A can be toxic, leading to a constellation of signs and symptoms as well as liver injury, jaundice, enlargement of the liver and spleen, portal hypertension and cirrhosis.