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Sodium Molybdate

Evidence Level
Limited
2 Clinical Trials
5 Documented Benefits
2/5 Evidence Score

Sodium molybdate is the most common supplemental form of the trace mineral molybdenum (Na2MoO4, roughly 40-47% elemental molybdenum depending on hydration). It is cheap, water-soluble, and well absorbed, and it appears in many multivitamins and standalone molybdenum products. Molybdenum is an essential cofactor for enzymes including sulfite oxidase, xanthine oxidase, and aldehyde oxidase, so molybdate is often marketed to support the breakdown of sulfites and sulfur-containing compounds. True dietary molybdenum deficiency is essentially unknown in healthy people, and the mineral has very low toxicity, so most supplementation simply ensures adequate cofactor availability.

Studied Dose RDA 45 mcg/day elemental Mo for adults. Supplements commonly provide 50-500 mcg/day. Tolerable upper limit 2,000 mcg/day.
Active Compound Sodium molybdate (Na2MoO4, often the dihydrate), a soluble inorganic salt providing ~40-47% elemental molybdenum; supplies the molybdate anion for the molybdenum cofactor.

Benefits

Sulfite Metabolism Support

Molybdenum is the cofactor for sulfite oxidase, the enzyme that converts sulfite to sulfate. Supplying molybdenum as molybdate helps ensure this enzyme has the cofactor it needs to support normal metabolism of sulfites and sulfur-containing amino acids.

Supported by Trial 1, Trial 2

Enzyme Cofactor Replenishment

Molybdate provides molybdenum used to build the molybdenum cofactor required by sulfite oxidase, xanthine oxidase, and aldehyde oxidase. Adequate molybdenum helps maintain the normal activity of these detoxification and purine-processing enzymes.

Supported by Trial 1, Trial 2

Purine and Uric Acid Processing

Xanthine oxidase, a molybdenum-dependent enzyme, helps convert purines to uric acid for excretion. Molybdenum from molybdate supports the normal function of this pathway as part of routine nitrogen and purine metabolism.

Supported by Trial 1, Trial 2

Reliable, Well-Absorbed Source

Because sodium molybdate is highly soluble, it is efficiently absorbed from the gut and effective at restoring molybdenum status when intake is low. This makes it a dependable choice for general molybdenum supplementation.

Supported by Trial 2

Maintains Adequate Trace-Mineral Status

For people with limited dietary molybdenum, molybdate provides a simple way to help maintain adequate levels of this essential trace mineral, supporting the broad set of enzymes that depend on the molybdenum cofactor.

Supported by Trial 1, Trial 2

Mechanism of action

1

Molybdenum Cofactor Formation

Absorbed molybdate is incorporated into a pterin scaffold to form the molybdenum cofactor (Moco), the prosthetic group that activates all human molybdenum-dependent enzymes. Cofactor availability sets the ceiling for these enzymes' activity.

2

Sulfite Oxidase Activation

Sulfite oxidase uses the molybdenum cofactor to oxidize sulfite to sulfate, a step essential for safely metabolizing sulfur amino acids. This is the only molybdenum enzyme whose loss is clearly harmful in humans.

3

Xanthine and Aldehyde Oxidase Function

Molybdenum cofactor also drives xanthine oxidase and aldehyde oxidase, which oxidize purines to uric acid and process various aldehydes and drugs, contributing to nitrogen handling and xenobiotic metabolism.

4

Urinary-Regulated Homeostasis

Soluble molybdate is efficiently absorbed and its body level is controlled mainly by urinary excretion, so the system buffers against both shortfall and excess and keeps cofactor supply within a stable range.

Clinical trials

1
Molybdenum Deficiency Reversed by Molybdate in TPN

Clinical case report of a patient on prolonged molybdenum-free total parenteral nutrition who developed sulfur amino-acid intolerance; supplemental molybdate (300 mcg/day) was added and biochemical and clinical responses were tracked.

Single long-term total parenteral nutrition patient.

The patient developed high blood methionine, low uric acid, and neurological symptoms consistent with impaired sulfite oxidase function; adding molybdate normalized sulfur handling and resolved symptoms. This is the principal human evidence that molybdenum is essential and that molybdate corrects its deficiency.

2
Molybdenum Absorption and Retention with Stable Isotopes

Controlled metabolic study using stable molybdenum isotopes in young men across low and high intakes, measuring absorption, urinary excretion, and retention during depletion and repletion.

Healthy young men in a metabolic ward.

Soluble molybdenum was efficiently absorbed across a wide intake range, and the body regulated status mainly by adjusting urinary excretion. The work shows molybdate is highly bioavailable and that homeostasis keeps retention stable, with an estimated requirement near or below 25 mcg/day.

Side effects and drug interactions

Common Potential side effects

Molybdenum has very low toxicity at normal supplemental doses and is generally well tolerated.
Very high intakes may interfere with copper status and contribute to copper deficiency over time.
Extremely high molybdenum intakes have been linked to joint pain and gout-like symptoms.
Large doses can occasionally cause mild gastrointestinal upset.
Staying under the 2,000 mcg/day adult upper limit avoids essentially all reported adverse effects.

Important Drug interactions

High-dose molybdenum can lower copper levels, opposing copper supplements or worsening deficiency.
Because xanthine oxidase makes uric acid, very high molybdenum may matter for people prone to gout.
Diets very high in sulfur or sulfate can increase molybdenum loss and lower its retention.
No major prescription-drug interactions are established at typical molybdenum supplement doses.

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Frequently asked questions about Sodium Molybdate

What is sodium molybdate?

Sodium molybdate is a common, well-absorbed form of the trace mineral molybdenum used in supplements and multiminerals. It supplies molybdenum to support the enzymes that process sulfur and certain waste products.

How much sodium molybdate should I take?

Molybdenum needs are tiny: the RDA is 45 mcg per day. Supplements provide small amounts. Keep total molybdenum well under the 2,000 mcg upper limit; high doses are unnecessary.

What is sodium molybdate used for?

It provides molybdenum for enzyme function, including the breakdown of sulfites and sulfur amino acids. Some people use it as part of sulfite-sensitivity or detox-support approaches, though evidence is limited.

Is sodium molybdate safe?

At the small amounts used it is very safe. As with all molybdenum, avoid excessive intake, which can interfere with copper and is unnecessary given how little the body needs.

What is the recommended dosage of Sodium Molybdate?

The clinically studied dose is RDA 45 mcg/day elemental Mo for adults. Supplements commonly provide 50-500 mcg/day. Tolerable upper limit 2,000 mcg/day. Always follow the product label and check with a healthcare provider for personal advice.

Is Sodium Molybdate safe, and does it have side effects?

For most healthy adults, Sodium Molybdate is well tolerated at studied doses. Reported effects can include: Molybdenum has very low toxicity at normal supplemental doses and is generally well tolerated. Very high intakes may interfere with copper status and contribute to copper deficiency over time. It may also interact with some medications. Sodium Molybdate is not right for everyone, so check with a healthcare provider first if you are pregnant or breastfeeding, have a medical condition, or take prescription medication.

Does Sodium Molybdate interact with any medications?

Possible interactions include: High-dose molybdenum can lower copper levels, opposing copper supplements or worsening deficiency. Because xanthine oxidase makes uric acid, very high molybdenum may matter for people prone to gout. If you take prescription medication, check with a pharmacist or doctor before using it.

How strong is the scientific evidence for Sodium Molybdate?

NutraSmarts rates the evidence for Sodium Molybdate as Limited (2 out of 5). It is backed by 2 clinical trials and 2 cited references summarized on this page. A higher rating reflects more, larger, and better-designed human studies.

References(2 citations)

Evidence ratings on NutraSmarts are based on the totality of human clinical research, with emphasis on randomized controlled trials, meta-analyses, and systematic reviews. The references below directly support claims made throughout this page.

  1. Abumrad NN, Schneider AJ, Steel D, Rogers LS. Amino acid intolerance during prolonged total parenteral nutrition reversed by molybdate therapy. Am J Clin Nutr. 1981;34(11):2551-9. doi: 10.1093/ajcn/34.11.2551.PubMedUsed to support: Landmark human case of diet-induced molybdenum deficiency on molybdenum-free TPN; supplemental molybdate (300 mcg/day) reversed sulfur amino-acid intolerance and normalized sulfite oxidase-related biochemistry, establishing molybdenum essentiality
  2. Turnlund JR, Keyes WR, Peiffer GL, Chiang G. Molybdenum absorption, excretion, and retention studied with stable isotopes in young men during depletion and repletion. Am J Clin Nutr. 1995;61(5):1102-9. doi: 10.1093/ajcn/61.5.1102.PubMedUsed to support: Stable-isotope metabolic study in young men showing soluble molybdenum is efficiently absorbed across a wide intake range and that status is regulated chiefly by urinary excretion, documenting molybdate's high bioavailability and tight homeostasis