人体必需元素，依含量不同，可分为宏量元素和微量元素。凡占人体总重量万分之一以上者，称为宏量元素，计有碳、氢、氧、氮、磷、硫、钙、镁、钠、钾、氯１１种元素，合计占人体总重量的９９９５％以上；凡占人体总重不到万分之一者均称为微量元素，计有铁、锌、铜、钴... Essential elements of the human body, according to different content, can be divided into macro elements and trace elements. Those who account for more than one ten thousandth of the total weight of the human body are referred to as macroelements and include eleven elements of carbon, hydrogen, oxygen, nitrogen, phosphorus, sulfur, calcium, magnesium, sodium, potassium and chlorine, Of the 99.95% or more; Where the total body weight less than one ten thousandth are called trace elements, total iron, zinc, copper, cobalt ...