Copper & Manganese: Role in the Body, Sources & Which Microgreens Have It

Cook something acidic in an old copper or cast-iron pan and you'll sometimes notice a faint metallic taste come through. It's a small, everyday reminder that trace metals genuinely end up in food, and that the body has real, specific uses for a couple of them most people never think about.

Copper and manganese are trace minerals that rarely headline a nutrition conversation on their own, which is partly why they're covered together here rather than as two separate posts. Across AgriZen's Wheatgrass, Sunflower, Kale, and Broccoli microgreens, the evidence for each ranges from genuinely strong to honestly thin, and this post says exactly which is which for every variety.

What It Is

Copper and manganese are both essential trace minerals, needed in small amounts but required for normal function. They're grouped together here largely because food composition research commonly measures and reports them together, not because they share a single biological role. Their biochemistry, covered below, is genuinely distinct.

Role in the Body

Copper: the electron-transfer metal

Copper's defining biochemical property is its ability to cycle between the Cu+ and Cu2+ oxidation states, which makes it useful anywhere an enzyme needs to shuttle electrons one at a time. Cytochrome c oxidase, the terminal enzyme of the mitochondrial electron transport chain, uses copper atoms to catalyse the final transfer of electrons to oxygen, the step that actually consumes the oxygen we breathe to generate ATP. Lysyl oxidase, a separate copper-dependent enzyme, catalyses the cross-linking of collagen and elastin fibres, giving connective tissue, blood vessel walls, and bone their structural integrity.

Two more copper enzymes are worth naming. Ceruloplasmin, the main copper-carrying protein in blood, doubles as a ferroxidase enzyme, oxidising iron from its Fe2+ to Fe3+ form so it can be loaded onto transferrin for transport, linking copper status directly to iron metabolism. Dopamine beta-hydroxylase, the fourth, converts dopamine into norepinephrine, a step in catecholamine neurotransmitter synthesis.

Manganese: mitochondrial antioxidant defence and metabolic enzymes

Manganese's best-characterised role is as the metal centre of manganese superoxide dismutase (MnSOD, also called SOD2), an enzyme located specifically inside mitochondria, where it converts superoxide, a reactive byproduct of the electron transport chain described above, into ordinary oxygen and hydrogen peroxide. Mitochondria are where the electron transport chain generates most of a cell's reactive oxygen species, which is why having a dedicated manganese-based antioxidant enzyme stationed inside them is functionally significant rather than a redundant backup to other antioxidant systems. Manganese is also a cofactor for pyruvate carboxylase, an enzyme central to gluconeogenesis (the synthesis of new glucose), and for enzymes involved in bone-matrix formation and urea cycle detoxification of ammonia via arginase.

Food Sources (General)

Organ meats and shellfish are the most concentrated copper sources. Among plant foods, nuts, seeds, and whole grains contribute both copper and manganese, with whole grains and tea being particularly notable manganese sources.

Which Microgreens Have It

This post links Broccoli, Wheatgrass, Sunflower, and Kale. Broccoli has the strongest single data point in this post: a real, direct manganese figure from a six-microgreen study, the highest of the group. Thakur, Dhaliwal & Sharma (2019) directly measured wheatgrass using atomic absorption spectroscopy and confirmed both copper and manganese at meaningfully elevated concentrations, alongside iron, magnesium, and potassium. Several other sources repeat this study's general finding, but the specific mg-per-100g figures we could locate for copper and manganese individually weren't consistent enough across sources for us to confidently report a single number. The study also measured lyophilized (freeze-dried) juice powder rather than fresh wheatgrass microgreens as AgriZen sells them, so even a confirmed figure would need a basis conversion we're not in a position to make reliably. Sunflower and Kale are both qualitative, each anchored to the best real evidence we could find.

RDI reference: approximately 0.9 mg/day copper (adult) and 2.3 mg/day manganese (adult men) / 1.8 mg/day (adult women), broadly consistent with ICMR-NIN 2020 Recommended Dietary Allowances for Indians. Without a confirmed wheatgrass figure, no meaningful % contribution can be calculated here.

Frequently Asked Questions

Which AgriZen microgreen has the strongest evidence for manganese?

Broccoli. A real, direct measurement puts its manganese content highest among six microgreens compared in the same study. Wheatgrass is confirmed to contain meaningful amounts of both copper and manganese too, but the specific numbers available weren't consistent or reliable enough to report as a firm figure.

Are copper and manganese deficiencies common?

True deficiency in either mineral is uncommon in people eating a varied diet, since both are widely distributed across many food categories. Wheatgrass would be a supplementary contribution alongside those broader dietary sources, not a primary strategy for either mineral.

Can I get too much copper or manganese from microgreens?

No realistic serving of microgreens would approach the upper intake level for either mineral, which is more of a concern with concentrated supplements than with food sources like these.

A Note on This Information

Everything above describes documented nutritional biochemistry and published research, not medical advice. Nothing on this page is a claim that any AgriZen microgreen treats, prevents, cures, or manages a medical condition. If you're managing a health condition, taking medication, pregnant, or have specific dietary needs, please check with a doctor or registered dietitian before making significant changes to your diet.