许多人知道维生素是营养素,因而进补。其实,盲目进补维生素对健康有害。大多维生素都是,缺了不行,多了有害。维生素A:缺乏维生素A可引起夜盲症、干眼病,并能影响生殖功能和胚胎的发育。维生素A的治疗量一般不会产生毒性。但若长期或大量服用维生素A,可引起中毒反应。成人一次用药超过50万单位,或儿童超过30万单位,可引起急性中毒,表现为头痛、烦躁、多汗、食欲不振等。不论成人还是儿童,连续用药超过6个月,皆可引起慢性中毒。维生素D:维生素D对钙、磷代谢及 Many people know that vitamins are nutrients and thus tonic. In fact, blind tonic vitamins harmful to health. Most of the vitamins are missing, not good, more harmful. Vitamin A: Lack of vitamin A can cause night blindness, dry eye, and can affect reproductive function and embryonic development. The amount of vitamin A treatment generally does not produce toxicity. However, if long-term or large doses of vitamin A, can cause toxic reactions. A single dose of over 500,000 units for adults or more than 300,000 children can cause acute poisoning, manifested as headache, irritability, sweating, loss of appetite and the like. Whether adults or children, continuous medication for more than 6 months, can cause chronic poisoning. Vitamin D: vitamin D on calcium and phosphorus metabolism and