研究表明,摄入过量的维生素是有害的。长期超量补充维生素A,如每天摄入33毫克维生素A,就会引起食欲不振,皮肤干燥、头发脱落、骨骼和关节疼痛等,还有导致骨质疏松的危险。一般认为服维生素C多点没有明显害处,因为它可被排泄掉,但美国最新研究认为,每天摄入维生素C超过1000毫克, Research shows that eating excessive amounts of vitamins is harmful. Long-term excess vitamin A, such as daily intake of 33 mg of vitamin A, can cause loss of appetite, dry skin, hair loss, bone and joint pain, as well as the risk of osteoporosis. Generally think that serving vitamin C more points no obvious harm, because it can be excreted, but the latest study in the United States that daily intake of vitamin C more than 1000 mg,