Molybdenum

non-nutrient/non-botanicalmolybdenum atom

What is it

Molybdenum is an essential trace mineral that serves as a cofactor for four enzymes: sulfite oxidase, xanthine oxidase, aldehyde oxidase, and mitochondrial amidoxime reducing component. It is found in beans, lentils, grains, and organ meats.

How it works

Molybdenum functions inside the body as the molybdenum cofactor (Moco), a complex molecule built around the metal that fits into the active site of molybdenum-dependent enzymes. The most important is sulfite oxidase, which converts toxic sulfite (a byproduct of sulfur amino acid metabolism) to harmless sulfate. Xanthine oxidase breaks down purines to uric acid, while aldehyde oxidase metabolizes various aldehydes and drugs. Dietary requirements are small because so little molybdenum is needed by these enzymes. Absorption is high (40-100%), and excess molybdenum is excreted in urine. Frank molybdenum deficiency is extraordinarily rare in humans on normal diets.

Evidence for 4 uses

AI-assisted evidence assessment — talk to your doctor before relying on any single supplement.

Molybdenum cofactor deficiency (genetic)

Grade A

Strong evidence

Although supplemental molybdenum alone does not treat this rare genetic disorder, the recently approved synthetic precursor cyclic pyranopterin monophosphate (cPMP) can restore enzyme function. Standard molybdenum supplementation does not address the underlying defect.

Wilson's disease (as tetrathiomolybdate, prescription only)

Grade B

Good evidence

Tetrathiomolybdate is a specialized molybdenum compound used to lower copper in Wilson's disease. This is a prescription intervention, not standard supplementation.

Sulfite sensitivity

Grade D

Mixed evidence

Theoretically, adequate molybdenum supports sulfite oxidase activity and may help people sensitive to sulfites in wine and processed foods. Direct human evidence is limited; supplementation may help if status is marginal.

General antioxidant / detoxification support

Grade D

Mixed evidence

Marketing claims around molybdenum for general detoxification are not strongly supported by clinical evidence. Adequate dietary intake supports its enzymatic roles, but supplementation in non-deficient people has unclear benefit.

2 commercial forms

Sodium molybdate

Inorganic salt; well absorbed.

Common form in multivitamins and standalone supplements. Inexpensive and effective for repletion.

Molybdenum amino acid chelate (glycinate)

Chelated form; similar bioavailability to molybdate.

Marketed for gentler absorption. Functional difference from molybdate is unclear at the small doses typically used.

Dosage

The RDA for adults is 45 mcg/day, with 50 mcg during pregnancy and lactation. Supplement doses typically range 50-500 mcg. The Tolerable Upper Intake Level is 2,000 mcg (2 mg) per day. Most diets provide adequate molybdenum without supplementation.

When and how to take it

Molybdenum can be taken at any time of day, with or without food. It is well-absorbed in either condition. Most multivitamins contain modest amounts that need no special timing. Avoid pairing high-dose molybdenum with high-dose copper in the same dose since they interact at absorption.

Food sources

Food	Amount	%DV
Black-eyed peas (1 cup, cooked)	288 mcg	—
Lima beans (1 cup, cooked)	141 mcg	—
Lentils (1 cup, cooked)	148 mcg	—
Soybeans (1 cup, cooked)	132 mcg	—
Beef liver (3 oz, cooked)	33 mcg	—
Oats (1 cup, cooked)	28 mcg	—
Brown rice (1 cup, cooked)	31 mcg	—
Eggs (1 large)	9 mcg	—

Safety

Molybdenum at dietary levels is very safe. High intake (above 10-15 mg/day) has been associated with gout-like joint pain due to elevated uric acid and increased copper excretion. The UL of 2,000 mcg/day provides a wide safety margin. Industrial inhalation exposure has caused symptoms but is unrelated to oral supplementation.

Who should be cautious

People with copper deficiency or those at risk (vegans on restricted diets, prolonged zinc supplementation) should be cautious with high-dose molybdenum. Pregnant women should not exceed the UL. Patients with gout should avoid high doses because molybdenum activates xanthine oxidase, which produces uric acid.

Interactions

High molybdenum intake increases copper excretion and can theoretically cause copper deficiency over time. This interaction is exploited therapeutically (as tetrathiomolybdate) in Wilson's disease to lower copper. Sulfate supplements may compete with molybdate for absorption. Otherwise minimal drug interactions.

Frequently asked questions

Do I need to supplement molybdenum?⌄

Almost certainly not. A serving of beans or lentils typically exceeds the RDA. Frank molybdenum deficiency from diet alone is essentially unknown.

Can molybdenum cause gout?⌄

High doses can elevate uric acid via xanthine oxidase activation. People with gout or hyperuricemia should avoid high-dose molybdenum supplements.

Does molybdenum help with sulfite intolerance?⌄

It theoretically supports sulfite oxidase, but clinical evidence in humans is limited. If your status is marginal, supplementation might help; for most people, dietary intake is already adequate.

Can molybdenum cause copper deficiency?⌄

Yes, at high doses over time. Molybdenum increases copper excretion. This is rarely a problem at typical multivitamin levels but matters at therapeutic doses.

Is molybdenum in my multivitamin enough?⌄

Yes. Most multivitamins contain 50-100 mcg, which meets or exceeds the RDA.

References

NIH Office of Dietary Supplements - Molybdenum Fact Sheet — NIH ODS link
Molybdenum - Wikidata — Wikidata link

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Disclaimer: These statements have not been evaluated by the FDA. This page is educational, not a substitute for personalized medical advice. Evidence grades are AI-assisted assessments — talk to your doctor before starting any new supplement, especially if you're pregnant, breastfeeding, on medications, or managing a chronic condition.