Hypervitaminosis is a type of reaction that occurs due to excess vitamin intake. Toxins in the body occur when taking extra vitamin 'A'. In adults, symptoms such as nausea , loss of appetite , headache , dry skin , bone pain, etc. may occur if the supplement is taken 100 times more than required. These symptoms occur when children take 20 times more vitamin A. Excess vitamin A during pregnancy damages the fetus.