Manganese Sulfate – Effects, Needs and Uses
Manganese sulfate is an inorganic manganese compound used as a mineral source in dietary supplements and the food industry.
Things worth knowing about "Manganese Sulfate"
Manganese sulfate is an inorganic manganese compound used as a mineral source in dietary supplements and the food industry.
What is Manganese Sulfate?
Manganese sulfate (chemical formula: MnSO₄) is an inorganic salt of the trace element manganese. It appears as a white to pale pink crystalline powder and is highly water-soluble. In medicine, nutritional science, and the food industry, manganese sulfate is used as a bioavailable source of manganese. Manganese is an essential trace element that the human body requires in small amounts for numerous biochemical processes.
Biological Functions of Manganese
Manganese plays important roles in the body as a cofactor for various enzymes:
- Antioxidant protection: Manganese is a component of mitochondrial superoxide dismutase (MnSOD), a key enzyme that neutralizes harmful free radicals.
- Bone and cartilage formation: Manganese is involved in the synthesis of proteoglycans, which are essential for healthy cartilage and bone tissue.
- Carbohydrate and fat metabolism: Manganese activates enzymes involved in the breakdown and synthesis of carbohydrates and fats.
- Wound healing and blood clotting: Manganese supports the synthesis of clotting factors and promotes wound healing.
- Nervous system: Manganese plays a role in neurotransmitter production and normal brain function.
Medical Use and Supplementation
Manganese sulfate is used in the following areas:
- Dietary supplements: As a well-absorbed source of manganese in mineral and multivitamin preparations.
- Parenteral nutrition: In intravenous nutrition, manganese sulfate is included in trace element solutions to prevent manganese deficiency.
- Food fortification: To enrich foods with manganese, for example in infant formula and dietetic products.
- Agriculture: As a fertilizer and animal feed additive to supply plants and animals with manganese.
Recommended Daily Intake
The European Food Safety Authority (EFSA) has not established a specific Recommended Dietary Allowance (RDA) for manganese, but has set an Adequate Intake (AI) value:
- Adult men: 3.0 mg/day
- Adult women: 3.0 mg/day
- Pregnant women: 3.0 mg/day
- Breastfeeding women: 3.0 mg/day
- Children: 0.5–2.5 mg/day depending on age
The WHO and national nutritional organizations recommend meeting manganese needs primarily through a balanced diet.
Deficiency
Isolated manganese deficiency in humans is rare and usually only occurs with very one-sided diets or in patients receiving long-term parenteral nutrition without adequate trace element supplementation. Possible symptoms of manganese deficiency include:
- Impaired bone and cartilage development
- Disturbances in glucose metabolism
- Reduced antioxidant capacity
- Skin changes and delayed wound healing
Dietary Sources
Manganese occurs naturally in many foods. Particularly rich sources include:
- Whole grain products and oats
- Legumes (lentils, chickpeas)
- Nuts and seeds (hazelnuts, pine nuts)
- Green leafy vegetables (spinach, kale)
- Tea (black and green tea)
- Pineapple and blueberries
Overdose and Toxicity
Manganese is toxic in high amounts. Chronic overexposure -- especially through inhalation (e.g., in mining or welding industries) -- can lead to manganism, a neurological syndrome with symptoms similar to Parkinson disease (tremor, movement disorders, personality changes). With oral intake via food or dietary supplements, the risk is considerably lower, as the intestine regulates absorption. The EFSA has recommended a tolerable total intake of 11 mg/day for adults from all sources.
Interactions
Manganese sulfate can interact with other nutrients and substances:
- Iron: Iron and manganese compete for the same transporters in the intestine. High iron intake can inhibit manganese absorption and vice versa.
- Calcium and phosphorus: High intake levels can reduce the bioavailability of manganese.
- Antacids and proton pump inhibitors: Medications that alter gastric pH can affect manganese absorption.
- Antibiotics (quinolones, tetracyclines): Manganese can reduce the absorption of these antibiotics; a time interval of several hours is recommended.
References
- European Food Safety Authority (EFSA): Dietary Reference Values for Manganese. EFSA Journal, 2013.
- World Health Organization (WHO): Trace Elements in Human Nutrition and Health. Geneva, 1996.
- Aschner, J.L. & Aschner, M.: Nutritional aspects of manganese homeostasis. Molecular Aspects of Medicine, 2005; 26(4-5): 353-362.
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