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Liver Health

Molybdenum

Evidence Level
Moderate
1 Clinical Trial
4 Documented Benefits
3/5 Evidence Score

Molybdenum is an essential ultratrace mineral required as a cofactor for four known human metalloenzymes: sulfite oxidase (sulfur amino acid metabolism), xanthine oxidase (purine catabolism and uric acid production), aldehyde oxidase (drug/xenobiotic metabolism), and mARC (mitochondrial amidoxime reducing component, involved in nitrogen metabolism). Molybdenum deficiency is extremely rare under normal dietary conditions — the mineral is widely distributed in legumes, grains, and leafy vegetables. It appears in multivitamin formulas primarily for completeness.

Studied Dose 45 mcg/day (RDA for adults); tolerable upper intake level: 2,000 mcg (2 mg)/day; most dietary intakes easily meet RDA; supplemental doses typically 50–150 mcg/day
Active Compound Sodium molybdate or ammonium molybdate — molybdenum bisglycinate chelate for enhanced absorption; extremely small amounts required (mcg/day, not mg/day)
Deficiency information View details

Molybdenum deficiency from diet has essentially never been documented in healthy people — only one case has ever been reported (a man on long-term TPN). Molybdenum is abundant in legumes, whole grains, and leafy vegetables, and human requirements are very low (45 µg/day). The much more serious clinical entity is molybdenum cofactor deficiency — a rare inherited metabolic disorder, not a dietary issue.

Common symptoms

  • Documented dietary molybdenum deficiency in humans is essentially nonexistent (1 historical case)
  • In that single TPN case: tachycardia, headache, night blindness, mental disturbances, coma in late stages
  • Inherited molybdenum cofactor deficiency (a separate genetic condition): seizures, severe neurological damage, early infant death — this is NOT dietary

At-risk groups

  • Routine molybdenum supplementation is unnecessary for healthy people
  • Only documented at-risk group: people on long-term parenteral nutrition without molybdenum (rare)
  • Note: 'molybdenum cofactor deficiency' is an inherited enzyme deficiency, not addressable by dietary molybdenum
When to see a doctor: Symptoms attributed to molybdenum deficiency in the general population almost certainly have a different cause. Standalone molybdenum supplementation is rarely necessary. If you encounter products marketing molybdenum for sulfite sensitivity, copper detox, or general wellness, the evidence base is weak. Stay within the UL of 2,000 µg/day to avoid toxicity (gout-like symptoms, joint pain).
Explore related deficiencies →
Sources: NIH ODS — Molybdenum Health Professional Fact Sheet · DRI — Molybdenum (NCBI Bookshelf NBK222301)

Benefits

Sulfite detoxification via sulfite oxidase

Sulfite oxidase — the most critical molybdenum enzyme — converts sulfite (SO₃²⁻) to sulfate (SO₄²⁻), preventing sulfite accumulation. Sulfite is produced during the metabolism of sulfur-containing amino acids (methionine, cysteine) and is found in wine and dried fruits as a preservative. Molybdenum deficiency impairs sulfite detoxification, causing sulfite sensitivity symptoms.

Supported by Trial 1

Uric acid production via xanthine oxidase

Xanthine oxidase catalyzes the final two steps of purine catabolism — converting hypoxanthine to xanthine and xanthine to uric acid. This molybdenum-dependent enzyme is the target of allopurinol (gout medication) and is essential for normal purine metabolism. Molybdenum adequacy ensures proper purine catabolism and uric acid clearance.

Supported by Trial 1

Xenobiotic and drug metabolism via aldehyde oxidase

Aldehyde oxidase metabolizes numerous endogenous aldehydes, drugs, and environmental chemicals — including retinaldehyde (vitamin A metabolism), benzaldehyde, and several pharmaceutical compounds (zaleplon, ziprasidone, methotrexate). Adequate molybdenum is required for normal drug metabolism, particularly relevant for individuals on aldehyde oxidase-metabolized medications.

Supported by Trial 1

Essential completeness in multivitamin formulas

While standalone molybdenum supplementation is rarely indicated, its inclusion in comprehensive multivitamin-mineral formulas ensures complete coverage of all essential micronutrients — particularly relevant for individuals with restricted diets, malabsorption conditions, or low legume/grain intake.

Supported by Trial 1

Mechanism of action

1

Molybdenum cofactor (Moco) biosynthesis

Dietary molybdate is incorporated into molybdenum cofactor (Moco) — a tricyclic pyranopterin compound that binds molybdenum and is inserted into all four molybdoenzymes. Moco synthesis is a multi-step pathway conserved across all organisms, and genetic defects in Moco synthesis cause molybdenum cofactor deficiency — a severe inherited metabolic disorder.

2

Oxidative hydroxylation catalysis

Molybdoenzymes catalyze oxidative hydroxylation reactions using water as the oxygen donor — distinct from cytochrome P450 oxidases that use molecular oxygen. This unique reaction mechanism explains the specific substrate profiles of xanthine oxidase and aldehyde oxidase in purine and xenobiotic metabolism.

3

Sulfite oxidase and sulfur amino acid catabolism

Sulfite oxidase in the mitochondrial intermembrane space oxidizes sulfite to sulfate — the terminal step in cysteine and methionine catabolism. Sulfate is then exported for sulfation reactions (glycosaminoglycan synthesis, steroid hormone conjugation) or renal excretion. Without functional sulfite oxidase, sulfite accumulates causing neurological damage.

Clinical trials

1
Molybdenum Deficiency in TPN — Foundational Case Series
PubMed

Clinical case series describing molybdenum deficiency in patients receiving prolonged total parenteral nutrition (TPN) without molybdenum supplementation. (Abumrad et al. 1981, Am J Clin Nutr — the foundational case)

TPN-dependent patients.

Molybdenum-deficient TPN patients developed: hypermethioninemia, low serum uric acid, elevated sulfite excretion, neurological symptoms including encephalopathy. Symptoms reversed with molybdenum supplementation. Established Mo as essential trace mineral. Subsequent work refined RDA. Note: deficiency is essentially confined to TPN context; dietary deficiency is virtually unknown.

Side effects and drug interactions

Common Potential side effects

Extremely well tolerated at dietary and standard supplemental doses (50–150 mcg/day)
High-dose molybdenum (>10 mg/day) can cause gout-like symptoms by increasing xanthine oxidase activity and uric acid production
Very high doses may impair copper absorption — unlikely at normal supplemental doses

Important Drug interactions

Allopurinol — both inhibit xanthine oxidase; theoretical additive effect on uric acid reduction at very high molybdenum doses
Copper — high molybdenum may reduce copper absorption via competitive mechanisms; monitor copper status with very high molybdenum intake
Aldehyde oxidase-metabolized drugs — molybdenum status affects aldehyde oxidase activity; potential influence on drug metabolism at extreme deficiency or excess

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Frequently asked questions about Molybdenum

What is molybdenum used for?

Molybdenum is an essential trace mineral that helps several enzymes break down sulfur-containing amino acids and clear certain waste products. Deficiency is very rare because tiny amounts are needed and most diets supply enough.

How much molybdenum should I take?

The RDA is just 45 mcg per day for adults, easily met by foods like legumes, grains, and nuts. Supplements provide small amounts. The tolerable upper limit is about 2,000 mcg per day; there is little reason to take high doses.

Do I need a molybdenum supplement?

Most people get enough from food, so supplementation is rarely necessary. It is sometimes included in multiminerals or used by people with specific dietary or genetic needs, but routine high-dose molybdenum is not recommended.

Is molybdenum safe?

At dietary and normal supplemental amounts it is very safe. Excessive intake can interfere with copper and cause other effects, so stay well within recommended limits.

What is Molybdenum?

Molybdenum is an essential ultratrace mineral required as a cofactor for four known human metalloenzymes: sulfite oxidase (sulfur amino acid metabolism), xanthine oxidase (purine catabolism and uric acid production), aldehyde oxidase (drug/xenobiotic metabolism), and mARC (mitochondrial amidoxime reducing component, in…

What are the signs of Molybdenum deficiency?

Molybdenum deficiency from diet has essentially never been documented in healthy people — only one case has ever been reported (a man on long-term TPN). Molybdenum is abundant in legumes, whole grains, and leafy vegetables, and human requirements are very low (45 µg/day).

What is the recommended dosage of Molybdenum?

The clinically studied dose is 45 mcg/day (RDA for adults); tolerable upper intake level: 2,000 mcg (2 mg)/day; most dietary intakes easily meet RDA; supplemental doses typically 50–150 mcg/day Always follow the product label and check with a healthcare provider for personal advice.

Is Molybdenum safe, and does it have side effects?

For most healthy adults, Molybdenum is well tolerated at studied doses. Reported effects can include: Extremely well tolerated at dietary and standard supplemental doses (50–150 mcg/day) High-dose molybdenum (>10 mg/day) can cause gout-like symptoms by increasing xanthine oxidase activity and uric acid production It may also interact with some medications. Molybdenum 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 Molybdenum interact with any medications?

Possible interactions include: Allopurinol — both inhibit xanthine oxidase; theoretical additive effect on uric acid reduction at very high molybdenum doses Copper — high molybdenum may reduce copper absorption via competitive mechanisms; monitor copper status with very high molybdenum intake If you take prescription medication, check with a pharmacist or doctor before using it.

How strong is the scientific evidence for Molybdenum?

NutraSmarts rates the evidence for Molybdenum as Moderate (3 out of 5). It is backed by 1 clinical trial and 4 cited references summarized on this page. A higher rating reflects more, larger, and better-designed human studies.

References(4 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. Oskarsson A, Kippler M. Molybdenum - a scoping review for Nordic Nutrition Recommendations 2023. Food Nutr Res. 2023;67:. doi: 10.29219/fnr.v67.10326.PubMedUsed to support: Scoping review of molybdenum for nutrition recommendations, confirming it is an essential trace element whose requirements are easily met by diet, with deficiency very rare. Frames the supplement need honestly.
  2. Atwal PS, Scaglia F. Molybdenum cofactor deficiency. Mol Genet Metab. 2016;117(1):1-4. doi: 10.1016/j.ymgme.2015.11.010.PubMedUsed to support: Review of molybdenum cofactor deficiency, explaining why molybdenum is essential: it forms the cofactor for enzymes such as sulfite oxidase and xanthine oxidase. Supports molybdenum's essential biochemical role.
  3. Feng C, Tollin G, Enemark JH. Sulfite oxidizing enzymes. Biochim Biophys Acta. 2007;1774(5):527-39. doi: 10.1016/j.bbapap.2007.03.006.PubMedUsed to support: Review of the molybdenum-dependent sulfite-oxidizing enzymes, central to processing sulfur compounds in the liver. Supports the liver and detox framing of molybdenum's enzyme role.
  4. Holzinger S, Anke M, Röhrig B, Gonzalez D. Molybdenum intake of adults in Germany and Mexico. Analyst. 1998;123(3):447-50. doi: 10.1039/a706882d.PubMedUsed to support: Study of dietary molybdenum intake in adults, showing typical diets readily supply adequate amounts. Context for molybdenum's nutritional role and the limited need to supplement.