“微量元素”,顾名思义含量甚微,是在人体中含量小于0.01％,仅占人体元素总量的0.05％,在适当的浓度下有重要生理作用的一些无机元素。已被世界公认的维持机体生命活动不可缺少的必需元素有14种,即铁、锌、铜、碘、氟、锰、钴、钼、镍、铬、硅、锡、钒、硒。对人体的每天供给量以毫克或微克计。 “Trace elements”, as their name implies, contain only insignificant amounts of inorganic elements, which are less than 0.01% in the human body and account for only 0.05% of the total amount of human elements and have important physiological functions at appropriate concentrations. It has been recognized by the world that there are 14 essential elements required to maintain the life activities of the body, namely iron, zinc, copper, iodine, fluorine, manganese, cobalt, molybdenum, nickel, chromium, silicon, tin, vanadium and selenium. Daily supply to the human body in milligrams or micrograms.