Manganese

Mechanism of Action

Manganese is a cofactor for manganese superoxide dismutase (MnSOD/SOD2, the primary mitochondrial antioxidant enzyme), arginase (urea cycle), pyruvate carboxylase (gluconeogenesis), glutamine synthetase (ammonia detoxification in brain), and glycosyltransferases (proteoglycan/GAG synthesis for cartilage and bone). It activates several kinases and phosphatases involved in cell signaling. Manganese is essential for bone formation, cartilage integrity, and reproductive function.

Dosing Protocol

Notes

Manganese is typically obtained sufficiently from diet (tea, whole grains, nuts, leafy greens) and is included in most multimineral formulas. Standalone supplementation is rarely necessary. The primary concern is EXCESS, not deficiency — chronic environmental or occupational exposure causes manganism, a parkinsonian syndrome. Iron-deficient individuals accumulate more brain manganese via upregulated DMT1. Welders and those living near heavy industry have higher exposure risk.

Stacking

• Calcium
• Vitamin D3
• Glucosamine
• Collagen

Interactions

• Iron [MEDIUM] — Manganese and iron share DMT1 transporter — high iron intake reduces Mn absorption and vice versa
• Antacids/PPIs [LOW] — May alter manganese absorption
• Tetracyclines [LOW] — Manganese may reduce tetracycline absorption

Contraindications

• Liver disease (Mn is hepatically cleared — accumulation risk)
• Iron deficiency (upregulated DMT1 increases Mn brain accumulation)
• Chronic occupational Mn exposure

Side Effects

• Generally well tolerated at standard doses
• Neurotoxicity at chronic high exposure (manganism — Parkinson-like syndrome)
• GI upset
• Headache

Key Papers

• 10.1016/j.neuro.2006.11.003
• 10.1007/978-94-007-7500-8_3
• 10.1016/j.jtemb.2018.08.007

Source Quality

Manganese glycinate or manganese bisglycinate chelate preferred. Manganese sulfate and gluconate are acceptable. Dosing should stay under 11mg/day (UL). Brands: Usually obtained through multimineral formulas (Thorne Basic Nutrients, Pure Encapsulations ONE Multivitamin).

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