Manganese: What It Does, Food Sources, and Daily Needs
Manganese supports metabolism, bone formation, antioxidant defenses, and enzyme function, while whole grains, legumes, nuts, seeds, tea, and vegetables can help meet daily needs.
Key takeaways
- Manganese is an essential trace mineral. The body needs only small amounts for the activity of several enzymes.
- It supports normal metabolism. Manganese participates in the metabolism of carbohydrates, amino acids and cholesterol.
- Plant foods are major sources. Whole grains, legumes, nuts, seeds and some vegetables provide manganese.
- Adults need only a few milligrams per day. The AI is 2.3 mg for adult men and 1.8 mg for adult women.
- Deficiency is very rare. Most people can obtain enough manganese from an ordinary varied diet.
In this article
Manganese is an essential trace mineral that the body needs in small amounts. It participates in metabolism, bone formation, antioxidant defense, blood clotting and the activity of several important enzymes.
Manganese is found in many foods, especially whole grains, legumes, nuts, seeds, tea and certain vegetables. For most people, a varied diet provides enough manganese, while true deficiency is considered very rare.
What Is Manganese?
Manganese is an essential trace mineral present in small amounts in the body. It should not be confused with magnesium, because manganese and magnesium are completely different minerals with different structures, functions and daily requirements.
Manganese works mainly as a cofactor for enzymes, meaning it helps certain enzymes perform their normal functions. These include manganese superoxide dismutase, arginase and pyruvate carboxylase.
Only about 1–5% of dietary manganese is absorbed in adults. The body can adjust absorption to some extent according to intake, while manganese is eliminated mainly through bile.
What Does Manganese Do?
Although the body needs only a very small amount of manganese, the mineral participates in several physiological processes through manganese-dependent enzymes. Its functions include metabolism, bone formation, antioxidant defense, blood clotting, reproduction and immune activity.
It supports metabolism
Manganese is involved in enzymes that help the body metabolize carbohydrates, amino acids and cholesterol. It also participates in processes related to glucose use and cellular energy production.
This does not mean manganese supplements increase energy or speed up metabolism when intake is already adequate. A nutrient’s normal physiological role is different from an additional benefit obtained by taking larger doses.
It contributes to bone formation
Manganese participates in the activity of enzymes involved in the formation of bone tissue. It works alongside other nutrients needed for the skeleton rather than acting independently.
Researchers continue to study the relationship between manganese and bone health. Current evidence does not show that taking manganese supplements alone improves bone health in people who already consume enough.
It supports the body’s antioxidant systems
Manganese is required for the enzyme manganese superoxide dismutase, or MnSOD. This enzyme helps neutralize certain reactive oxygen species produced during normal cellular metabolism.
MnSOD is part of the body’s natural antioxidant defenses. This role does not mean that high-dose manganese supplements provide additional antioxidant protection.
It participates in blood clotting
Manganese also contributes to processes involved in normal blood clotting and hemostasis, together with vitamin K. Manganese-dependent enzymes also participate in reproduction and immune function.
These functions help explain why manganese is considered essential even though the body requires only a few milligrams per day.
How Much Manganese Do You Need?
There is currently no Recommended Dietary Allowance (RDA) for manganese. Because available data were not sufficient to establish an EAR and RDA, the National Academies set Adequate Intake (AI) values based on observed intakes in healthy populations.
| Age / Life Stage | Men | Women |
|---|---|---|
| 1–3 years | 1.2 mg | 1.2 mg |
| 4–8 years | 1.5 mg | 1.5 mg |
| 9–13 years | 1.9 mg | 1.6 mg |
| 14–18 years | 2.2 mg | 1.6 mg |
| Adults 19+ | 2.3 mg | 1.8 mg |
| Pregnancy | — | 2.0 mg |
| Breastfeeding | — | 2.6 mg |
Adults therefore need only a few milligrams of manganese per day. This is much less than the quantities required for macrominerals such as calcium, magnesium and potassium.
What Foods Contain Manganese?
Manganese is found in a wide variety of foods. Important sources include whole grains, nuts, legumes, some fruits and vegetables, tea and certain types of seafood.
| Food | Serving | Approximate Manganese |
|---|---|---|
| Hazelnuts | 28 g | ~1.6 mg |
| Pecans | 28 g | ~1.1 mg |
| Brown rice | ½ cup | ~1.1 mg |
| Chickpeas | ½ cup | ~0.9 mg |
| Spinach | ½ cup | ~0.8 mg |
| Pineapple | ½ cup | ~0.8 mg |
| Soybeans | ½ cup | ~0.7 mg |
| Whole-wheat bread | 1 slice | ~0.7 mg |
| Oats | ½ cup | ~0.7 mg |
| Peanuts | 28 g | ~0.5 mg |
| Black tea | 1 cup | ~0.5 mg |
| Lentils | ½ cup | ~0.5 mg |
| Blueberries | ½ cup | ~0.3 mg |
| Sesame seeds | 1 tablespoon | ~0.2 mg |
These values are approximate and can vary depending on the food and preparation method. Grains and plant foods contribute substantially to manganese intake, while grain products, tea and vegetables are among the important sources in adult diets.
Some types of seafood are also particularly rich in manganese. For example, about 85 g of mussels may provide around 5.8 mg, considerably more than the adult daily AI.
What Is Manganese Deficiency?
Manganese deficiency is considered very rare in humans, and its signs are not well established. NIH does not currently identify population groups that are routinely considered at increased risk of inadequate manganese intake.
Limited evidence suggests that severe deficiency could potentially affect bone formation, growth, and carbohydrate and fat metabolism. Because deficiency is so uncommon, these effects are much less clearly defined than deficiencies of nutrients such as iron or iodine.
Can You Get Too Much Manganese?
Manganese obtained from food is not usually a concern for healthy people. However, excessive exposure can become toxic, and the nervous system is one of the main areas affected.
For adults, the Tolerable Upper Intake Level (UL) is 11 mg per day, including manganese from food, beverages and supplements. The UL is a safety ceiling, not an intake target.
Very high exposure can also come from sources other than food, including inhalation of manganese-containing dust in certain occupations or water with unusually high concentrations. Manganese toxicity can cause neurological symptoms such as tremor and muscle spasms.
People with chronic liver disease may be more vulnerable because manganese is normally eliminated primarily through bile. Impaired biliary excretion can therefore reduce the body’s ability to remove excess manganese.
Do You Need a Manganese Supplement?
For most people, getting enough manganese from food is not difficult. The mineral is also included in some multivitamins and multimineral supplements.
Supplements may contain forms such as manganese sulfate, gluconate, citrate or different chelated forms. Current evidence does not clearly show that one supplemental form is superior to the others.
Because true manganese deficiency is very rare and excessive intake can be harmful, routine manganese supplementation is not necessary for most people without a specific reason.
Frequently Asked Questions
What is the difference between manganese and magnesium?
Manganese and magnesium are two completely different minerals. Manganese is a trace mineral required in amounts of only a few milligrams per day, while magnesium is a macromineral needed in much larger amounts.
Both participate in enzyme activity, but their physiological functions, dietary requirements and food sources are different. Similar names do not mean the minerals can be used interchangeably.
How much manganese do you need per day?
The AI for adults is 2.3 mg per day for men and 1.8 mg for women. During pregnancy, the AI is 2.0 mg, while during breastfeeding it increases to 2.6 mg.
These values are Adequate Intakes rather than RDAs. Current evidence has not been sufficient to establish an RDA for manganese.
Which foods are highest in manganese?
Whole grains, nuts, legumes, tea, certain vegetables and some fruits are useful sources. Mussels and some other types of seafood can provide particularly large amounts.
A varied diet that includes whole grains, legumes, nuts, seeds and vegetables will usually provide manganese without requiring a special food or supplement.
Is manganese deficiency common?
No. Manganese deficiency is considered very rare in humans, and NIH does not currently identify groups that routinely have a high risk of inadequate intake.
For this reason, manganese supplements are not usually necessary simply to prevent deficiency. Most people can obtain sufficient amounts through food.
Can you take too much manganese?
Yes. The adult UL is 11 mg per day from food, beverages and supplements, and excessive exposure can affect the nervous system.
Toxicity from an ordinary diet is uncommon. Risk becomes more relevant with very high exposures, certain supplements, occupational exposure, and medical conditions that interfere with manganese elimination.
Final thoughts
Manganese is an essential trace mineral involved in metabolism, bone formation, antioxidant defense, blood clotting and the normal activity of several enzymes. Adults need only a few milligrams per day, and foods such as whole grains, legumes, nuts, seeds, tea, vegetables and some seafood can provide meaningful amounts.
True manganese deficiency is very rare, so most people do not need a dedicated manganese supplement. A varied diet is generally sufficient to meet daily needs.
Although dietary manganese is usually safe, excessive exposure can affect the nervous system. This is why the adult UL of 11 mg per day should be viewed as a safety ceiling rather than a nutritional goal.
References
- NIH Office of Dietary Supplements — Manganese: Fact Sheet for Consumers ods.od.nih.gov
- NIH Office of Dietary Supplements — Manganese: Fact Sheet for Health Professionals ods.od.nih.gov
- NIH Office of Dietary Supplements — Nutrient Recommendations and Databases ods.od.nih.gov
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