Molybdenum is a trace element that acts as a cofactor for important enzymes. Learn how molybdenum helps metabolize proteins and why its deficiency is extremely rare.

Molybdenum is a trace element that acts as a cofactor for four important enzymes: sulfite oxidase (detoxifies sulfites), xanthine oxidase (purine metabolism, uric acid production), aldehyde oxidase and mitochondrial amidoxime reductase. Although the need for molybdenum is very low, it is critically important for protein metabolism — which is especially relevant for athletes consuming large amounts of protein.
Molybdenum-containing enzymes participate in the metabolism of sulfur-containing amino acids (methionine, cysteine). For athletes consuming large amounts of protein, this helps process amino acids more efficiently.
Sulfite oxidase (a molybdenum enzyme) detoxifies sulfites — preservatives often found in dried fruits, wine and processed foods.
Xanthine oxidase breaks down purines (from meat, fish) into uric acid. Athletes who consume a lot of meat may have an increased need for this enzyme.
Xanthine oxidase also produces reactive oxygen species (ROS), but also participates in antioxidant defense through the production of urates (uric acid) — urates are important antioxidants in the blood.
| Product | Molybdenum (100 g) | % RDA | Notes |
|---|---|---|---|
| Lentils (cooked) | 75 μg | 167% | Protein, fiber, iron |
| Beans (cooked) | 65 μg | 144% | Protein, magnesium |
| Oats | 50 μg | 111% | Beta-glucans, slow carbohydrates |
| Liver (beef) | 70 μg | 156% | Iron, vitamin A |
| Peas (cooked) | 40 μg | 89% | Plant Proteins |
| Nuts (walnuts) | 30 μg | 67% | Omega-3, magnesium |
Probably not. Molybdenum deficiency is extremely rare because it is found in many common foods, and the requirement is very low (45 μg/day). Supplements are needed only in specific medical conditions (e.g., sulfite oxidase deficiency) or for parenteral nutrition.
Paradoxically, both deficiency and excess can have an effect. Xanthine oxidase (a molybdenum enzyme) produces uric acid. However, gout is mainly caused not by molybdenum intake but by excess purines in the diet and genetic factors.
Yes, most high-quality multimineral complexes contain molybdenum (usually 25-75 μg). This is a sufficient amount for people who exercise. Athletes do not need separate molybdenum supplements.