Molybdenum is found in a wide range of everyday foods, with legumes, organ meats, and dairy products topping the list. Most adults need just 45 micrograms (mcg) per day, and a single half-cup of black-eyed peas delivers more than six times that amount. Because so many common foods contain it, deficiency from diet alone is extremely rare.
The Richest Food Sources
Legumes are by far the most concentrated source. Half a cup of boiled black-eyed peas contains 288 mcg of molybdenum, which is 640% of the daily value. Lima beans come in at 104 mcg per half cup. Other beans and lentils follow a similar pattern: if it’s a legume, it’s a strong source.
Organ meats are the next tier. Three ounces of pan-fried beef liver provides 104 mcg, matching lima beans serving for serving. Research on sheep tissues shows how dramatically molybdenum concentrates in organs versus muscle: liver contained about 75 times more molybdenum than regular muscle meat. Kidney tissue held roughly 30 times more. So a standard cut of beef or lamb steak has some molybdenum, but nowhere near what liver delivers.
Dairy, grains, and produce fill in the rest. A cup of plain low-fat yogurt has 26 mcg, and a cup of 2% milk has 22 mcg. A medium baked potato provides 16 mcg. Breakfast cereals like Cheerios or shredded wheat contribute about 15 mcg per half cup. A medium banana also sits at 15 mcg, and a half cup of cooked white rice adds 13 mcg.
Here’s what that means practically: even without touching legumes or liver, a day of eating dairy, grains, and vegetables will likely get you to 45 mcg without effort.
Why the Amount Varies by Food
The molybdenum content of plant foods depends partly on the soil they’re grown in. Research from the U.S. Geological Survey across 24 forest sites in Oregon found that exchangeable molybdenum in soil was highest in acidic conditions, and correlated with the amount of organic matter present. Interestingly, the type of bedrock underneath had almost no effect on how much molybdenum ended up in soil or plant tissue.
Plants also appear to regulate their own molybdenum uptake. In that same study, the molybdenum in leaves showed no relationship to how much was measured in the soil. This means two batches of the same crop grown in different regions could have noticeably different levels, but the variation isn’t dramatic enough to cause nutritional problems for most people. Legumes consistently run high regardless of geography because they use molybdenum-dependent enzymes in their root nodules to convert nitrogen from the air.
How Much You Need
The recommended daily amount shifts with age:
- Infants 0 to 6 months: 2 mcg
- Infants 7 to 12 months: 3 mcg
- Children 1 to 3 years: 17 mcg
- Children 4 to 8 years: 22 mcg
- Children 9 to 13 years: 34 mcg
- Teens 14 to 18 years: 43 mcg
- Adults 19 and older: 45 mcg
- Pregnant or breastfeeding: 50 mcg
These numbers are small compared to what most diets deliver. Surveys consistently show that the average American gets well above the recommended amount through food alone, largely because grains and legumes are dietary staples.
What Molybdenum Does in Your Body
Your body uses molybdenum as a working part of four specific enzymes. Each one handles a different chemical reaction, but all four deal with breaking down or transforming molecules that would otherwise accumulate.
The most well-known is the enzyme responsible for the final steps of breaking down purines, the building blocks of DNA. This enzyme converts those compounds into uric acid, which your kidneys then filter out. A second enzyme handles sulfite, a byproduct of digesting the amino acids methionine and cysteine (found in meat, eggs, and other protein-rich foods). It converts sulfite into sulfate, a harmless form your body can excrete. A third enzyme helps metabolize various drugs and foreign compounds. The fourth, discovered more recently, also plays a role in detoxification reactions inside your cells’ mitochondria.
Without enough molybdenum, these enzymes can’t function. But because the amounts needed are so tiny, dietary shortfalls essentially don’t happen in people eating a normal mixed diet.
When Deficiency Does Occur
True molybdenum deficiency in humans is almost exclusively a genetic condition called molybdenum cofactor deficiency (MoCD), not a dietary problem. It’s extremely rare and results from the body’s inability to build the molecular structure that activates molybdenum inside enzymes.
The severe form appears in the first days of life, causing seizures, feeding difficulties, and progressive neurological damage. All affected infants develop significant developmental impairment. A milder form can appear later in childhood or adulthood, sometimes triggered by infections, with symptoms like movement disorders, unsteadiness, and muscle tone changes. This is a genetic disease, not something caused by eating too few beans. For the vast majority of people, molybdenum intake is a non-issue.
Getting Too Much
Because molybdenum is so abundant in common foods, you might wonder whether it’s possible to overdo it. From food alone, toxicity hasn’t been documented in humans. The body is efficient at excreting excess molybdenum through urine. Supplements typically contain 50 to 100 mcg per dose, which stays well within safe territory. Most people have no reason to supplement, since a single serving of legumes or a glass of milk already covers or exceeds the daily recommendation.
Occupational exposure to molybdenum dust in mining or metalworking is a different story and has been linked to joint pain and elevated uric acid levels, but that involves inhaling industrial quantities, not eating lentil soup.