Manganese
A trace mineral essential for bone formation, carbohydrate metabolism, and antioxidant defense via manganese superoxide dismutase (MnSOD), an important mitochondrial antioxidant enzyme.
What is Manganese?
Manganese is an essential trace mineral that serves as a cofactor for enzymes involved in bone formation (glycosyltransferases), carbohydrate metabolism (pyruvate carboxylase), and antioxidant defense (manganese superoxide dismutase, MnSOD). It is concentrated in bone, liver, kidneys, and the pancreas.
Known Health Benefits
How It Works
Manganese is the catalytic center of MnSOD (SOD2), the primary mitochondrial antioxidant enzyme that converts superoxide radicals to hydrogen peroxide and oxygen. It activates glycosyltransferases required for proteoglycan synthesis (cartilage and bone matrix). Pyruvate carboxylase, a manganese enzyme, is essential for gluconeogenesis. Arginase, another manganese enzyme, converts arginine to ornithine and urea in the urea cycle. Manganese also influences insulin secretion through its role in pancreatic beta-cell function.
What Research Says
Manganese deficiency in humans is rare because dietary intake usually meets needs, but animal studies demonstrate that deficiency causes skeletal abnormalities, impaired glucose tolerance, and altered lipid metabolism. A 1994 study in the American Journal of Clinical Nutrition found that low manganese intake was associated with reduced bone mineral density in postmenopausal women. The combination of manganese, calcium, zinc, and copper improved spinal BMD in a 2-year clinical trial. Chronic manganese overexposure (welders, miners) causes manganism, a Parkinson-like syndrome.
Active Compounds
Manganese sulfate, manganese bisglycinate, manganese gluconate
Forms & Bioavailability
Manganese absorption is low (1–5% of dietary intake) and is regulated by the liver via biliary excretion. Iron and manganese share the divalent metal transporter-1 (DMT1), so high iron intake or supplementation competitively reduces manganese absorption. Phytates and oxalates also inhibit absorption. Tea drinkers and those on plant-heavy diets may absorb less.
Dosage Guidance
| Use Case | Dosage |
|---|---|
| RDA (men) | 2.3 mg |
| RDA (women) | 1.8 mg |
| Bone health (combined mineral) | 5 mg |
| Osteoarthritis support | 5–15 mg |
Always consult a healthcare provider for personalized dosing.
Natural Food Sources
- Mussels (5.8 mg per 3 oz)
- Hazelnuts (1.6 mg per oz)
- Brown rice (1.1 mg per ½ cup cooked)
- Oatmeal (0.99 mg per ½ cup)
- Pineapple (0.77 mg per ½ cup)
- Spinach (0.84 mg per ½ cup cooked)
- Black tea (0.5–1.0 mg per cup)
Potential Side Effects
Neurological effects at very high environmental exposure; generally safe at dietary supplement doses
Who Should Avoid It
- Liver disease (cirrhosis, hepatitis) — manganese is excreted via bile; accumulation risk → neurotoxicity
- Iron-deficiency anemia — increased DMT1 expression can increase manganese absorption and toxicity risk
- Chronic occupational manganese exposure (welders, miners) — do not supplement
- Parenteral nutrition patients — IV manganese bypasses hepatic first-pass regulation; neurotoxicity risk
Pregnancy & Lactation
The AI increases to 2.0 mg during pregnancy and 2.6 mg during lactation. Manganese crosses the placenta and is present in breast milk. Deficiency during pregnancy can impair fetal skeletal development in animal models. Supplementation beyond dietary intake is rarely needed. The UL is 11 mg/day for adults, but lower thresholds may apply during pregnancy due to increased absorption.
Known Drug Interactions
May interact with antacids, certain antibiotics, and iron supplements
Evidence Classification
Supported by cohort studies, case-control studies, or multiple observational studies with consistent findings.
Frequently Asked Questions
Is manganese the same as magnesium?
No. Despite similar names, they are completely different minerals. Manganese (Mn) is a trace mineral needed in milligrams, while magnesium (Mg) is a macromineral needed in hundreds of milligrams. They serve different biochemical roles.
Can manganese supplementation cause neurological problems?
At dietary and standard supplement doses (1–10 mg), manganese is safe. Neurotoxicity (manganism) is associated with chronic high-level environmental or occupational exposure (welders, miners inhaling manganese dust), or IV administration that bypasses liver regulation.
Why is manganese important for bone health?
Manganese activates glycosyltransferases needed for proteoglycan synthesis in cartilage and bone matrix. A clinical trial combining manganese with calcium, zinc, and copper showed improved spinal bone density in postmenopausal women.
Does manganese interact with iron absorption?
Yes. Iron and manganese share the DMT1 transporter. High iron supplementation reduces manganese absorption, and vice versa. If supplementing both, take them at different times of day.
How much manganese is in my diet?
The typical Western diet provides 2–5 mg of manganese daily, which meets the AI. Vegetarians and tea drinkers may consume more but absorb less due to phytates and tannins.
References
- Manganese superoxide dismutase, MnSOD and its mimics. Miriyala S, Spasojevic I, Tovmasyan A, et al.. Biochimica et Biophysica Acta (2012)View study
- Spinal bone loss in postmenopausal women supplemented with calcium and trace minerals. Strause L, Saltman P, Smith KT, et al.. Journal of Nutrition (1994)View study
- Manganese — Fact Sheet for Health Professionals. National Institutes of Health, Office of Dietary Supplements. NIH ODS (2021)View study
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This entry is for educational purposes only. It is not medical advice. Always consult a qualified healthcare provider before starting, stopping, or changing any supplement regimen, especially if you take medications or have health conditions.