NutriStack
Iron and Molybdenum, a caution.
Molybdenum and iron sit on opposite ends of a shared copper-mediated pathway. In classic nutrition literature (largely ruminant and animal work, with weaker human signals) chronically high molybdenum has been associated with disturbed iron metabolism via induced copper insufficiency. At normal supplement doses this is a low-concern, slow-developing relationship rather than an acute clash.
One pair, every claim cited. The two substances, the type, the mechanism, the recommendation, and the primary literature.
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What the row says.
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At a glance
- Substances
- Iron and Molybdenum
- Pair type
- Caution
- Evidence (highest tier)
- Emerging
- Source citations
- 3 sources
- Stack Score effect
- −5 to your Stack Score (per scored caution row).
- Scope
- Supplement × Supplement
- Last verified
- May 30, 2026
Caution · Emerging evidence
Caution
What is happening. Molybdenum and iron sit on opposite ends of a shared copper-mediated pathway. In classic nutrition literature (largely ruminant and animal work, with weaker human signals) chronically high molybdenum has been associated with disturbed iron metabolism via induced copper insufficiency. At normal supplement doses this is a low-concern, slow-developing relationship rather than an acute clash.
Mechanism. Indirect interaction through the copper, molybdenum, sulfur axis. Sustained excess molybdenum can promote formation of poorly absorbed copper-molybdenum-sulfur (thiomolybdate) complexes that lower copper status. Because copper-dependent ferroxidases (ceruloplasmin and hephaestin) are required to oxidize ferrous iron for loading onto transferrin and for iron mobilization from stores, a molybdenum-driven copper deficit can secondarily impair iron utilization. Molybdenum and iron handling are therefore metabolically linked through copper rather than by a direct interaction.
Recommendation. No special timing needed for routine doses. Keep molybdenum at typical supplemental amounts (around 45 to 150 mcg/day; the adult tolerable upper limit is about 2 mg/day) so it does not erode copper status, since copper is what links molybdenum to iron handling. If you take iron for diagnosed deficiency, do not rely on high-dose molybdenum to help; address copper and iron directly and recheck ferritin and CBC with your clinician. Avoid prolonged high-dose molybdenum (well above 1 mg/day) alongside iron repletion without monitoring copper.
Minimum separation. None required at normal doses
Sources (3)
- Mills CF, Davis GK. Reviews on the relationships of copper and molybdenum to iron metabolism.
- Institute of Medicine (US) Panel on Micronutrients. Dietary Reference Intakes, molybdenum chapter. National Academies Press, 2001.
- Linus Pauling Institute, Micronutrient Information Center: Molybdenum (copper and iron interrelationships).
Stack Score
How this pair moves the number.
Effect on the composite score
If both Iron and Molybdenum are in the same stack, this pair applies −5 to your Stack Score (per scored caution row).
The full algorithm, the clamping rules, and four worked stacks are documented at /methodology/stack-score.
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