Bioavailability of minerals or any group of nutrients has been defined in a variety of ways. It usually refers to the portion of a given source of mineral that can be absorbed and/or utilized for a specific biochemical or an integrated metabolic function by a given species. Recently, body immunity and health values of animal products have also been considered criteria of mineral bioavailability. In practice, bioavailability of minerals is listed in percentage, either as absolute values that represent the actual proportion of the mineral that can be absorbed or utilized, or relative values that are in relation to a response obtained with a highly available standard reference mineral source.

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