(Part 14 of 25 in series, M. Eades' Blog)
Zinc and copper are absorbed through the same ionic channel, and when there is an overabundance of zinc it gets absorbed instead of the copper. […] Certain elements in their ionic form get absorbed through the same channel. As long as these elements present to the channel in a specific ratio, they get through in that same ratio. If, however, there is an overabundance of one, it occupies the channel, preventing the other from getting through and can create an deficiency of the other despite an adequate intake.
~ Michael Eades