There are other copper antagonists such as zinc, however while zinc is generally documented as such in the nutritional literature, it is not only the weakest of all copper antagonists, but its action on copper takes place only on an intestinal level, so once copper goes into storage, zinc will have no effect on lowering copper any longer. The only time zinc could become a threat to copper is in situations where either copper levels are already on the low side and high amounts of zinc are ingested, or when potassium and calcium - being synergistic allies to copper - are well below normal... Full Text