Also known as: Manganese bisglycinate, Manganese sulphate, Manganese gluconate, Mn
MineralsStrong evidence
A trace mineral needed for antioxidant enzymes, bone formation and carbohydrate handling. Shortfall is rare, requirements are easily met from food, and there is little reason to supplement it deliberately.
Typical dose
2.0–5.0 mg per day
With food; away from iron and calcium supplements
What it is
Manganese is a trace mineral, not to be confused with magnesium despite the similar name — they are different elements doing different jobs, and the confusion is common enough to be worth stating.
Sources include wholegrains, nuts, legumes, leafy vegetables and tea. Tea is a particularly notable contributor in the UK, where regular drinkers can obtain a substantial share of their intake from it alone.
Requirements are modest and most diets meet them comfortably. Manganese appears in multivitamins and bone formulas as part of a full mineral profile rather than because anyone identified a widespread shortfall.
How it works
Manganese sits at the centre of manganese superoxide dismutase, the antioxidant enzyme that operates specifically inside mitochondria. That is a significant role, since mitochondria are where most reactive oxygen species are generated.
It is also a cofactor for enzymes involved in forming bone matrix and cartilage, and for several enzymes in carbohydrate and amino acid metabolism.
Manganese additionally participates in the urea cycle, contributing to the clearance of nitrogen waste from protein breakdown.
What the evidence shows
Manganese's essentiality and its enzymatic roles are well established. What is far less established is any benefit from supplementing it in people with ordinary diets.
Genuine shortfall is rare enough that it has been difficult to study, and there is no meaningful body of research showing that supplementation improves bone, joint or metabolic outcomes in well-fed people.
Its presence in bone support formulas reflects its role in bone matrix formation rather than trial evidence that adding it helps. That is a reasonable formulation decision but not a reason to seek it out separately.
Dosing
Adequate intake is around 2 to 3 mg daily for adults, which ordinary food supplies without difficulty. Tea drinkers may exceed this from tea alone.
Supplements typically supply 2 to 5 mg, generally as part of a multivitamin or bone formula rather than as a standalone product.
There is little reason to take manganese deliberately unless your diet is unusually restricted. If you do, note that iron, calcium and phytates all reduce its absorption, so timing away from those improves uptake. Bisglycinate absorbs better than sulphate or oxide.
At a glance
Common forms
Manganese bisglycinate, Manganese sulphate, Manganese gluconate, Within multivitamins and bone formulas
Half-life / duration
Absorption is low and regulated; the liver clears excess via bile
Timing
With food; away from iron and calcium supplements
Competition status
Permitted — not on the WADA Prohibited List
Category
Minerals
Safety and side effects
Manganese from food and ordinary supplements is safe. Absorption is low and tightly regulated, and the liver clears excess through bile.
That clearance route matters: anyone who has been told their liver is not working normally handles manganese less well, and should not supplement it without medical advice.
Excess manganese affects the nervous system, though the well-documented cases involve industrial inhalation exposure rather than diet or supplements. Oral intake at supplemental levels is not the same risk, but it is a reason not to take large amounts casually. Check your total across multivitamins and bone products.
Who should avoid it
Do not supplement if you have been told your liver is not working normally, since manganese is cleared through bile. Check your total intake across multivitamins and bone formulas. Speak to your doctor before use if you take regular medication. Not established at high supplemental doses in pregnancy or breastfeeding.
This entry is provided for information only. Food supplements should not be used as a substitute for a varied and balanced diet and a healthy lifestyle. Consult a qualified healthcare professional before use if you are pregnant, breastfeeding, taking medication or under medical supervision.
