Recommended Daily Amounts and Biological Half-lives

RECOMMENDED DAILY AMOUNTS AND BIOLOGICAL HALF-LIVES 

The right amount of trace metal and even a macro-metal to be taken in one s diet varies widely and is controlled by a large number of factors. For example, the requirements of the human body range over a wide margin of concentrations depending on age, rates of tissue growth, general fitness, and the activity parameters of the individual concerned and upon other foods consumed in the diet. 

it is clear that it is almost impossible to lay down a table of recommended daily dietary amounts for all the nutrients. Nevertheless, distinguished professional bodies have tabulated the average required 

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