The level at which copper causes problems is unclear. But in combination with zinc , up to 3 mg per day is considered safe. People with Wilson's disease should never take copper. Zinc interferes with copper absorption. In the absence of copper supplementation, vitamin C may interfere with copper metabolism.
Copper improves absorption and utilization of iron .
Certain medications may interact with copper. Refer to the drug interactions summary for a list of those medications. For the convenience of the reader, the information in the table listing the supplements for particular conditions is also categorized. Requirements and toxicity of essential trace elements, illustrated by zinc and copper. Greist A, Tricot G, Hoffman R. Excessive zinc ingestion.