As intake of a mineral exceeds the requirement, an excessive amount may be absorbed, or a large amount of the unabsorbed mineral may prevent intestinal
absorption of other minerals in adequate amounts.
However, long - term zinc supplementation may affect
the absorption of other minerals especially copper.
(Phytate can inhibit
the absorption of other minerals as well, including iron.)
Before it sprouts, however, the phytic acid inhibits both phosphorus availability and
the absorption of other minerals.