Mineral ·Moderate evidence ·Reviewed May 2026
Trace mineral essential for enzyme function in sulfite and purine metabolism.
The bottom line
Evidence rating moderate. Most-documented uses: detoxification, sulfite metabolism, enzyme function. 16 sources indexed (1980–2026), with 4 interaction records on file.
Core mechanism
Cofactor for sulfite oxidase, xanthine oxidase, and aldehyde oxidase. Critical for detoxifying sulfites and metabolizing purines to uric acid.12,14
Well absorbed with or without food8
Dosing protocol
Trace mineral; doses above 2 mg/day are not recommended. Take with food.
Ranked by evidence and value.
Real-world pricing across three quality tiers. Assumes Molybdenum Glycinate.
Assumes 75-250 mcg/day. Vendor basis: NOW/iHerb, Vitacost, Pure Encapsulations, and Amazon marketplace; standalone molybdenum is low cost. Updated 2026-05-28.
How much you'd eat to match a supplemental dose.
Legumes are usually the most practical food source; content varies by soil.
What to test, the optimal window inside the conventional range, and how long a response takes.
Molybdenum supplementation raises serum levels; deficiency is rare outside of long-term parenteral nutrition.1,6
Specialty lab only. Urinary sulfite and uric acid can serve as functional markers since molybdenum cofactors include sulfite oxidase and xanthine oxidase.
High molybdenum intake can reduce copper bioavailability and accelerate copper depletion, potentially worsening or precipitating copper deficiency over time.
Recommendation: Avoid chronic high-dose molybdenum supplementation alongside copper-restricted diets. If both are needed, monitor copper status (ceruloplasmin) under clinician guidance and keep molybdenum at nutritional doses.
Molybdenum is a required cofactor for sulfite oxidase, the enzyme that detoxifies the sulfite generated when N-acetylcysteine and other sulfur compounds are metabolized, supporting clearance of the sulfur load.
Recommendation: No special timing needed. Adequate (not excessive) molybdenum status supports normal sulfur metabolism when taking NAC; do not megadose molybdenum.
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.
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.
This is a mechanistically grounded but largely theoretical absorption-competition concern. The molybdate versus sulfate competition for a shared intestinal transporter is well established in animal and cell studies, and MSM contributes to the sulfate pool. However, MSM is taken up by the small intestine in a high-capacity manner and is converted to sulfate mostly after absorption, so its direct dampening of molybdenum uptake in the gut is expected to be small, and no human study has measured an MSM effect on molybdenum status specifically. Note that added sulfate, if anything, lowers molybdenum exposure, so this is not a safety concern.
Recommendation: For most people no action is needed. If you take both and want to be conservative, especially if molybdenum is being used deliberately to correct a documented deficiency, separate them by about 2 to 3 hours by taking molybdenum on its own (for example with a different meal) rather than together with a large MSM dose (commonly 1.5 to 3 g or more). Keep molybdenum within the normal 45 to 150 mcg/day range. No separation is needed simply for safety.
Numbered references. Citations throughout the page link here.
Ferreira EA, Hofstede FC, Haijes-Siepel HA et al.. Timing of cerebral damage in molybdenum cofactor deficiency: A meta-analysis of case reports. Genetics in medicine open. 2024
Dietary intakes between 22-1500 mcg/day are safe; molybdenum very efficiently absorbed (88-93%) at all dietary intakes; retention regulated by urinary excretion.
Ivica A, Nimac M, Pelivan I et al.. Electrochemical Interactions of Titanium and Cobalt-Chromium-Molybdenum Alloy in Different Solutions. Materials (Basel, Switzerland). 2026
Chen S, Zhang P, Bai H et al.. Recent advances in nano-molybdenum oxide for photothermal cancer therapy. Nanomedicine (London, England). 2025
U.S. RDA is 45 mcg/day for adults; EFSA Adequate Intake is 65 mcg/day; molybdenum cofactor required for four human enzymes involved in purine/sulfur amino acid catabolism.
Liu H, Yu X, He S et al.. New Neuroimaging Findings in Patients with Molybdenum Cofactor Deficiency Type A: A Case Report and Literature Review. Current medical imaging. 2024
Kinsinger M, Ivanisevic J, Mithal DS. Novel pathogenic variant in a mild case of type B molybdenum cofactor deficiency: case report and literature review. BMC medical genomics. 2024
Systematic review of 128 studies found no relevant articles for molybdenum supplementation and athletic performance. Only iron and magnesium had sufficient quality evidence supporting use. Little evidence exists for most MTE supplementation to improve athletic performance.
Low order of toxicity observed in humans; toxicity associated with copper depletion, so those with inadequate copper intake at greater risk. Average intake 0.1-0.5 mg/day.
Brewer GJ. Interactions of zinc and molybdenum with copper in therapy of Wilson's disease. Nutrition (Burbank, Los Angeles County, Calif.). 1995
Molybdenum is essential as cofactor for xanthine oxidase, aldehyde oxidase, and sulfite oxidase; required for purine metabolism, sulfite detoxification, and amino acid metabolism.
Lesperance AL, Bohman VR, Oldfield JE. Interaction of molybdenum, sulfate and alfalfa in the bovine. Journal of animal science. 1985
Combined deficiency of sulfite oxidase and xanthine dehydrogenase due to molybdenum cofactor deficiency causes severe neurological symptoms including mental retardation and seizures.
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