Is Copper Supplements Safe with Molybdenum?
Free · No account · based on published sources including NIH ODS, FDA drug labels, and peer-reviewed literature
Avoid high-dose molybdenum supplementation (above 500 mcg/day) if you are also taking copper supplements or have copper-dependent metabolic needs. If both are prescribed, take them at separate times and have serum copper and ceruloplasmin levels monitored periodically.
Why this interaction occurs
Molybdenum and copper compete for shared intestinal metal transporter binding sites and share hepatic metabolic pathways. High molybdenum intake induces copper deficiency by forming thiomolybdate complexes that render copper biologically unavailable. Copper deficiency can cause anemia, neurological symptoms, and impaired immune function. This interaction is well-documented in ruminant animal studies and has clinical relevance in humans taking supplemental molybdenum.
Evidence
Evidence level: moderate.
Reported safety data
The FDA’s adverse event reporting system (FAERS) has received 141 reports mentioning Molybdenum. This reflects reported cases involving the medication in general — not confirmed causation, and not specific to the Molybdenum + supplement combination on this page.
FAERS reports are voluntary and cannot prove that a drug caused an event. Do not use report counts to assess the safety of this specific drug-supplement pair.
Frequently asked questions
Related interactions
All Copper Supplements interactions → · All Molybdenum interactions →
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Educational only — not medical advice.
Always confirm with your doctor or pharmacist.