Manganese
Compiled from published pharmacological and botanical literature. Not independently verified by Herbuno. Spotted an error or have a correction? Flag it below →
| Compound | Manganese (Mn) |
|---|---|
| Chemical class | Essential trace element — transition metal, biologically active principally as Mn(II) and Mn(III) |
| CAS | 7439-96-5 (elemental) · salt-specific CAS applies to each form |
| Primary source | Spirulina and Chlorella for botanical grades; sulphate, gluconate and bisglycinate salts for isolated grades |
| Key applications | Manganese superoxide dismutase cofactor, bone matrix formation, glycosaminoglycan synthesis, urea cycle |
| Claim strength | High for essentiality; Emerging for any supplementation benefit in replete populations |
| Typical form | Algal concentrate at declared assay, or mineral salt |
| Buy from Herbuno | Manganese 1.5% from Spirulina & Chlorella |
| Origin | Processed / Sourced from India |
| MOQ | R&D 100 g / 250 g (subject to stock) · Pilot batch 1–5 kg · Bulk 10 kg, 25 kg and above |
| Lead Time | Dispatch within 72 hrs from stock · fresh-batch production (typically 50 kg+): 10 working days |
| Documentation | CoA & MSDS standard with every lot; phytosanitary on request |
Name origin: From magnesia nigra, the black magnesia — the dark ore pyrolusite that ancient glassmakers added to remove the green tint iron impurities gave to glass. The name shares its root with magnesium and the two were confused for centuries before Johan Gottlieb Gahn isolated the metal in 1774. The glassmaking use, called glassmakers' soap, is documented in Pliny.
Traditional use: There is no therapeutic tradition for manganese, which is itself informative. Minerals that cause visible deficiency disease — iron, iodine, zinc — accumulate folk remedies. Manganese did not, because dietary deficiency does not occur in free-living humans under normal circumstances. Its historical uses were industrial: glass decolouring, steel alloying, and dry-cell batteries, where manganese dioxide remains a standard cathode material.
Research trajectory: Essentiality in animals was shown in the 1930s through deliberate depletion studies producing skeletal abnormalities and impaired growth. Human deficiency has never been convincingly demonstrated from ordinary diet; the few reported cases come from experimental depletion or prolonged parenteral nutrition without manganese. The clinically significant literature runs the other way, toward toxicity. Manganism — a parkinsonian syndrome described in miners and welders from the nineteenth century onward — established manganese as a neurotoxin by the inhalation route, and more recent work has examined whether excess intake from drinking water or parenteral nutrition can produce neurological effects.
Commercial source: Isolated manganese is supplied as sulphate, gluconate, citrate or bisglycinate, manufactured from ore derivatives. Algal manganese is a different route: Spirulina and Chlorella both accumulate manganese, and the biomass is extracted and standardised to a declared elemental percentage. Because manganese requirements are measured in low milligrams, the algal route is practical to formulate with, and it carries the clean-label positioning that mineral salts do not.
Evidence for Manganese Applications
Dietary manganese deficiency is essentially unknown in free-living humans, and any honest page has to open there. Manganese is abundant in wholegrains, nuts, legumes, leafy vegetables and tea — a single cup of tea supplies a substantial fraction of adequate intake. Reported human deficiency comes from experimental depletion protocols and from long-term parenteral nutrition formulations omitting it, not from ordinary eating. This means a manganese supplement aimed at the general population is addressing a deficit that population almost certainly does not have, which is a different proposition from zinc or iron. Claim strength: High.
The essentiality itself is not in question and the biochemistry is specific. Manganese superoxide dismutase is the mitochondrial isoform of the enzyme, structurally distinct from the cytosolic copper-zinc form, and it is the primary defence against superoxide generated by the respiratory chain. Manganese is also required by glycosyltransferases building proteoglycans in cartilage and bone matrix, by arginase in the urea cycle, and by pyruvate carboxylase. Animal depletion produces skeletal deformity and impaired glucose tolerance. The biochemistry is solid; it simply does not translate into a supplementation case in people who are replete. Claim strength: High.
Manganese neurotoxicity is real and route-dependent, which is the distinction that matters. Manganism presents as a parkinsonian syndrome with rigidity, bradykinesia, gait disturbance and psychiatric features, documented extensively in miners, welders and ferroalloy workers exposed by inhalation. The inhalation route bypasses the gut, where absorption is tightly regulated and typically only a few per cent of intake, and bypasses hepatic first-pass clearance. Oral manganese from food has not been shown to cause manganism. The concern with oral intake is narrower, relating mainly to people with impaired biliary excretion, since bile is the principal elimination route. Claim strength: High.
Multivitamin formulations routinely over-supply manganese, and this deserves direct attention from formulators. Adequate intake is 2.3 milligrams daily for men and 1.8 for women, figures already met or exceeded by most diets. Many multivitamins carry 2 to 5 milligrams on top of that, with no deficiency to correct and no demonstrated benefit. The US tolerable upper intake level is 11 milligrams and EFSA has declined to set one, citing insufficient data — which is a statement about evidence gaps rather than a safety endorsement. Including manganese in a multivitamin is largely a completeness convention rather than a nutritional decision. Claim strength: Moderate.
Bone health combinations are the main legitimate commercial context, and the evidence is for the combination rather than for manganese. Trials of calcium with manganese, copper and zinc have shown effects on bone density in postmenopausal women that calcium alone did not produce, which is sometimes cited as evidence for manganese specifically. It is not: the design does not isolate manganese's contribution. The rationale that bone matrix glycosyltransferases require manganese is sound, but attributing the trial result to manganese alone overstates what was tested. Claim strength: Emerging.
Iron interaction runs in both directions and is worth designing around. Manganese and iron share the divalent metal transporter DMT1, so they compete for absorption; iron deficiency upregulates that transporter and increases manganese uptake, while iron supplementation suppresses it. People with iron deficiency anaemia therefore absorb more manganese than intended, and iron-containing multivitamins reduce the absorption of the manganese alongside them. Neither effect is usually accounted for in formulation. Claim strength: Moderate.
Sourcing manganese from Herbuno. We supply Manganese 1.5% from Spirulina and Chlorella, standardised to declared elemental manganese, for clean-label and algal-matrix formulations.
Most of our enquiries for this material are for multimineral and bone formulations rather than standalone products, which matches where the evidence sits. All lots ship with CoA and MSDS as standard; request a quotation for pilot or bulk volumes.
Dosage & Formulator Specification
Elemental manganese is the specification figure. Manganese sulphate monohydrate is roughly 32% elemental manganese, gluconate around 11%, and bisglycinate varies with chelation ratio. Our algal concentrate at 1.5% delivers 15 milligrams of elemental manganese per gram of extract, so a 2 milligram dose requires about 133 milligrams of material — comfortably formulable, which is not the case for every botanical mineral. Confirm whether a supplier's figure refers to the salt, the extract or the element before calculating inclusion.
Adequate intake is 2.3 milligrams daily for adult men and 1.8 for women; there is no RDA, because the data were considered insufficient to set one. The US tolerable upper intake level is 11 milligrams. EFSA has not set an upper level. Typical supplement inclusions of 1 to 2 milligrams are reasonable where a multimineral format calls for completeness. We would question anything above about 5 milligrams in a daily product, since there is no deficiency to correct in the target population and no demonstrated benefit to offset the margin being consumed.
Formulation behaviour is straightforward but the interactions are not. Manganese salts are stable, not notably hygroscopic, and blend well. The complications are competitive: manganese competes with iron for DMT1 and with calcium, magnesium and zinc for shared uptake, so a multimineral containing all of them will deliver less of each than the label arithmetic implies. Phytate in a plant-protein base binds manganese as it binds zinc. As a transition metal, manganese can also contribute to oxidative degradation of sensitive vitamins, though it is considerably less aggressive than copper or iron in this respect.
For analytical control, specify elemental manganese by ICP-MS or ICP-OES with heavy metals on the same certificate. Algal material warrants particular attention here: Spirulina and Chlorella concentrate minerals generally, which is the point, but that includes undesirable ones, so cadmium, lead, arsenic and mercury limits should be explicit rather than assumed. Require the species on the certificate and, for Spirulina specifically, microcystin testing, which is a standard and necessary control for cyanobacterial biomass. India-origin material ships with phytosanitary certification on request alongside CoA and MSDS.
One structural point applies to the whole algal-mineral category and is worth raising before a specification is fixed. The same biology that makes Spirulina and Chlorella useful mineral carriers — aggressive uptake and intracellular concentration — operates without discrimination between wanted and unwanted elements, and it responds to the cultivation water. Two lots of the same species from different ponds can differ materially in both manganese assay and contaminant load. That argues for lot-level heavy metal data rather than a type certificate, for specifying the cultivation source where you can, and for building an assay range into the specification instead of a single target figure. Formulators accustomed to the batch-to-batch consistency of mineral salts should plan for more variation here.
Frequently Asked Questions — Manganese
Does anyone actually need a manganese supplement?
Dietary deficiency is essentially unknown in free-living people. Manganese is abundant in wholegrains, nuts, legumes, leafy vegetables and tea — a cup of tea alone supplies a meaningful fraction of adequate intake. The reported human deficiencies come from experimental depletion and from parenteral nutrition that omitted it. A general-population manganese supplement is correcting a deficit that population does not have.
Is manganese neurotoxic?
By inhalation, yes — manganism is a well-documented parkinsonian syndrome in miners, welders and ferroalloy workers. That route bypasses gut regulation, where absorption is only a few per cent of intake, and bypasses hepatic clearance. Oral manganese from food has not been shown to cause it. The oral concern is narrower and applies mainly to impaired biliary excretion, since bile is the main elimination route.
Why do multivitamins include manganese then?
Largely convention. Adequate intake is 1.8 to 2.3 mg daily, which most diets already meet, and many multivitamins add 2 to 5 mg on top. There is no deficiency to correct and no demonstrated benefit. We will supply to your specification, but we would question anything above roughly 5 mg in a daily product.
What about manganese for bone health?
The trials showing benefit used calcium with manganese, copper and zinc together, against calcium alone. That design cannot isolate manganese's contribution. The rationale is sound — bone matrix glycosyltransferases do require manganese — but attributing the result to manganese alone overstates what was tested.
What should I test for in algal manganese?
Heavy metals explicitly, not by assumption. Spirulina and Chlorella concentrate minerals, which is the point of using them, and that includes cadmium, lead, arsenic and mercury. For Spirulina specifically require microcystin testing, which is standard and necessary for cyanobacterial biomass. Plus species identification on the certificate.
Why source manganese from India?
Roughly 80% of raw nutraceutical ingredients originate in China and a second qualified origin is increasingly a continuity requirement. India has established algal cultivation, particularly for Spirulina, with the downstream testing infrastructure that cyanobacterial material requires.