Manganese: The Evidence, Food Sources, and Supplement Guidance

Quick answer

Manganese is a trace mineral your body uses for bone formation, energy metabolism, and antioxidant defense. Adults need about 2.3 mg a day (men) or 1.8 mg a day (women), and whole grains, nuts, legumes, leafy greens, and tea supply it easily. Deficiency from food is extremely rare. The real hazard is breathing in manganese dust in certain jobs, which can cause a Parkinson-like condition, while the upper limit from supplements is 11 mg a day.

What manganese does

Illustration of manganese-rich foods including brown rice, oatmeal, pecans, spinach and black tea beside icons for bone, energy and antioxidant defense — Illustration: manganese supports bone formation, energy metabolism and antioxidant defense, and comes from whole grains, nuts, leafy greens and tea.

Manganese works as a cofactor for several enzymes:

Antioxidant defense: manganese is part of manganese superoxide dismutase, an enzyme in mitochondria that neutralizes harmful molecules.
Bone formation: manganese is needed by enzymes that help build the bone matrix.
Metabolism: manganese helps break down carbohydrates, amino acids, and cholesterol.
Urea cycle: manganese is part of arginase, an enzyme in the process that clears ammonia.
Blood clotting and immune function: manganese is involved in several steps that support normal clotting and immunity.

The practical point: manganese is a trace mineral with a role in bone, energy, and antioxidant systems, and it is easy to get from ordinary foods.

How much manganese you need

Start with the baseline, because manganese needs are small and food covers them:

Adequate intake (AI): 2.3 mg a day for adult men, 1.8 mg a day for adult women.
Pregnancy: 2.0 mg. Breastfeeding: 2.6 mg.
Tolerable upper intake level (UL): 11 mg a day for adults, counting all sources.
Typical intake in the United States: about 2 to 3 mg a day, which meets the target.

Because the AI is low and whole foods are rich in manganese, a normal varied diet is the whole plan. Supplements are rarely needed, and the upper limit exists mainly to catch unusual intakes.

One reason the target is expressed as an adequate intake rather than a recommended allowance is that manganese intakes have not been linked to a specific deficiency disease in healthy people. That is a sign of how comfortable ordinary diets are for this mineral, not an invitation to take more.

Manganese foods

Manganese is found in many plant foods:

Whole grains: brown rice, oatmeal, and whole-wheat bread are strong sources.
Nuts: pecans, almonds, and other nuts.
Legumes: beans, lentils, and soy.
Leafy green vegetables: spinach and similar greens.
Tea: black tea is a notable source, contributing meaningfully for regular tea drinkers.
Other foods: pineapple, mussels, and clams also provide manganese.

The simple rule: whole grains, nuts, and legumes at most meals cover manganese without thinking about it.

Deficiency and excess

Illustration of a manganese risk scale from a varied diet that is usually fine, to workplace exposure risk, to medical care — Illustration: manganese from food is usually fine, while breathing manganese fumes at work is the real risk and needs medical attention if symptoms appear.

Manganese is unusual because deficiency is nearly unheard of while excess is the better-known problem.

Deficiency is extremely rare and is almost never caused by diet. It has been reported in people on long-term intravenous nutrition without manganese, and in some rare metabolic disorders. Possible signs include bone loss, a skin rash, changes in hair color, and altered blood cholesterol.

Excess manganese is the bigger concern:

The best-documented risk is breathing manganese dust or fumes in occupations such as welding, mining, and battery manufacturing. This can cause manganism, a Parkinson-like condition with tremor, slow movement, and balance problems.
People with liver disease clear manganese more slowly and can accumulate it.
Very high intakes over time can interfere with iron and copper handling, though this is uncommon from food.

The practical takeaway: manganese is a mineral where the diet looks after you and the risks sit mostly outside the diet. Get it from whole foods, and if you have workplace exposure or liver disease, treat that as a medical question rather than a supplement one.

Supplements and who should be careful

Illustration comparing workplace manganese fumes and supplements with getting enough manganese from food — Illustration: manganese risk comes mainly from workplace fumes, while food manganese is enough for most people.

Manganese supplements are not needed for most people, because food covers the requirement.
The upper limit is 11 mg a day for adults. Some joint or multivitamin products add manganese, so check labels if you take several products.
If you work with welding, mining, or battery manufacturing, workplace exposure, not diet, is the main source of risk. Follow occupational safety measures and get medical advice if you notice tremor, slow movement, or balance changes.
If you have liver disease, ask a doctor before taking manganese supplements, because clearance is reduced.
For everyone else, food manganese is safe and sufficient.

The honest position: treat manganese as a nutrient you get from food, not a supplement to chase. If you have occupational exposure or liver disease, that is a medical conversation, not a supplement decision.

FAQ

What does manganese do in the body?

Manganese helps enzymes that support bone formation, energy metabolism, the breakdown of carbohydrates and cholesterol, antioxidant defense, and the clearing of ammonia.

How much manganese do I need per day?

About 2.3 mg for adult men and 1.8 mg for adult women, with slightly higher amounts during pregnancy and breastfeeding. The upper limit is 11 mg a day.

Which foods are high in manganese?

Whole grains such as brown rice and oatmeal, nuts, legumes, leafy green vegetables, and black tea. Pineapple, mussels, and clams also provide manganese.

Can you have manganese deficiency?

Deficiency from food is extremely rare. It has been reported mainly in people on long-term intravenous nutrition and in rare metabolic disorders.

Is too much manganese harmful?

Yes, mainly through breathing manganese dust at work, which can cause a Parkinson-like condition. High intakes from supplements over time can also interfere with iron and copper, so stay near the recommended amount.

Sources

National Institutes of Health, Office of Dietary Supplements: Manganese, Health Professional Fact Sheet. https://ods.od.nih.gov/factsheets/Manganese-HealthProfessional/
National Institutes of Health, Office of Dietary Supplements: Manganese, Consumer Fact Sheet. https://ods.od.nih.gov/factsheets/Manganese-Consumer/
National Academies, Dietary Reference Intakes: Manganese (chapter). https://www.ncbi.nlm.nih.gov/books/NBK222332/
Linus Pauling Institute, Oregon State University: Manganese. https://lpi.oregonstate.edu/mic/minerals/manganese

Disclaimer

This article is for information only and is not medical advice. Always consult a qualified healthcare provider about your health.

Reviewed by the VI Editorial Team. Last reviewed: September 22, 2026