Manganese

Manganese is a vital micronutrient required in small amounts but with wide-reaching effects throughout the body. It acts as a cofactor (helper molecule) for numerous enzymes that drive essential biological reactions, including those involved in carbohydrate, amino acid, and cholesterol metabolism.

One of its most important roles is as part of manganese superoxide dismutase (Mn-SOD), an antioxidant enzyme found in mitochondria — the energy-producing structures within cells. Mn-SOD neutralizes free radicals, unstable molecules that can damage cells and accelerate aging and disease if not controlled.

Manganese also supports collagen formation, bone mineralization, wound healing, and neurotransmitter synthesis, making it crucial for both musculoskeletal and nervous system health. The mineral contributes to the normal functioning of enzymes such as arginase (involved in the urea cycle) and glutamine synthetase (important for brain and muscle function).

Your body regulates manganese levels carefully through intestinal absorption and excretion via bile. Because only small amounts are stored in the liver, pancreas, bones, and kidneys, regular dietary intake is necessary. Manganese is naturally present in nuts, seeds, whole grains, legumes, tea, and leafy green vegetables.

Manganese is essential for energy production, antioxidant protection, bone development, and neurological health. Balanced levels support metabolic efficiency, while deficiency or excess can cause cellular dysfunction and disease.

Deficiency:
Manganese deficiency is uncommon but can occur due to poor diet, malabsorption, or excessive intake of other competing minerals such as iron or calcium. Low manganese can impair bone formation, leading to skeletal abnormalities or delayed growth. It may also contribute to poor wound healing, reproductive issues, and reduced antioxidant defence, making the body more vulnerable to oxidative stress.

Excess:
Too much manganese is toxic, particularly to the nervous system. Chronic high exposure — most often from occupational settings like mining, welding, or manufacturing — can cause manganism, a neurological condition resembling Parkinson’s disease. Symptoms may include muscle rigidity, tremors, walking difficulties, and mood changes. Elevated manganese levels may also occur from contaminated drinking water or over-supplementation.

Emerging research links manganese imbalance to various chronic conditions. Low levels are associated with osteoporosis, metabolic syndrome, and impaired glucose metabolism, while high levels have been linked to neurotoxicity, cognitive decline, and possibly increased cardiovascular risk. Because manganese interacts closely with iron and other metals, maintaining balance among trace minerals is essential for preventing both deficiency and toxicity.

Dietary Factors:

• Rich sources: Nuts (almonds, pecans), seeds (pumpkin, sunflower), whole grains (brown rice, oats), legumes, leafy greens (spinach, kale), and tea.

• Low intake: Diets lacking in plant foods or heavy in refined grains may lead to deficiency.

• Excess intake: Overuse of supplements or large amounts of tea (a manganese-rich beverage) can elevate levels.
  

Lifestyle Factors:
Occupational exposure — particularly in welders, miners, and metalworkers — is the most common cause of elevated manganese. Chronic alcohol use or liver disease can also affect manganese clearance, as the liver is responsible for excreting excess manganese into bile.

Related Biomarkers:

• Iron: High iron levels reduce manganese absorption, while iron deficiency can increase manganese uptake, potentially leading to excess accumulation.

• Calcium and Magnesium: Compete with manganese for intestinal absorption.

• Zinc: Excess zinc intake may lower manganese levels.
  

Micronutrient Impacts:
Deficiencies in other nutrients like vitamin B1 (thiamine) and choline can impair manganese-dependent enzyme activity. Balanced intake of iron, calcium, and magnesium is necessary for optimal manganese utilisation.

Environmental Influences:
Manganese exposure can occur through airborne dust, industrial pollution, or drinking water contaminated by manganese-rich soil or pipes. Populations relying on groundwater in mining regions are particularly susceptible.

Your Results Are High

If your manganese levels are elevated, it may indicate overexposure or reduced excretion.

Diet

• Limit manganese-dense foods such as nuts, seeds, whole grains, and tea until levels normalize.
  

Lifestyle

• Reduce exposure to manganese in occupational settings by using appropriate protective masks and ventilation systems. Avoid drinking from potentially contaminated water sources.
  

Supplements

• Discontinue manganese supplements and avoid multivitamins containing manganese.

If Your Results Are Low

Low manganese may result from poor dietary intake, malabsorption, or interference from other minerals.

Diet

• Include manganese-rich foods such as nuts, seeds, whole grains, legumes, and leafy greens several times per week.
  

Lifestyle

• Avoid excessive calcium or iron supplementation, which can block manganese absorption. Prioritise gut health — conditions like celiac disease or Crohn’s may impair mineral absorption.
  

Supplements

• A low-dose manganese supplement or a balanced trace mineral complex can help, under professional supervision.

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5. Finley JW. Manganese Absorption and Metabolism in Humans. Nutrition Research Reviews. 2020;33(1):22–33. doi:10.1017/S0954422419000238