Carnosine And Anti-Ageing
Quick Read Carnosine is a small molecule your muscles naturally produce that declines with age. Research suggests it fights three
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You probably think about antioxidants in terms of vitamin C, vitamin E, maybe a handful of blueberries. But what if one of your body’s most powerful internal antioxidant systems — one operating deep inside your mitochondria, right where cellular damage begins — depends on a trace mineral most people have never given a second thought to? Manganese isn’t glamorous. It doesn’t have the marketing budget of omega-3 or the celebrity endorsement of vitamin D. But inside every one of your cells, there’s a remarkable enzyme called manganese superoxide dismutase (MnSOD) — and without adequate manganese, it simply cannot do its job. That job, it turns out, is to neutralise some of the most destructive molecules your body produces. So before you reach for another antioxidant supplement and ignore the mineral that powers your body’s own defences, it’s worth understanding what the research actually says.
*VitacuityAI analysed 1.7 million research papers and selected the most relevant studies on manganese and antioxidant defence to inform this article.*
To understand why manganese matters, you need a quick tour of your mitochondria — the tiny structures inside your cells that generate energy. As a byproduct of making that energy, mitochondria constantly produce reactive oxygen species (ROS): unstable molecules that, if left unchecked, damage your cell membranes, your DNA, and your proteins [5]. This is oxidative stress — the slow, cumulative kind that underlies much of what we associate with ageing.
Your body has evolved a sophisticated defence against this. MnSOD — manganese-containing superoxide dismutase — sits inside the mitochondria and neutralises superoxide, one of the most reactive and damaging of these ROS molecules, before it can cause harm [9]. Think of MnSOD as a permanently stationed firefighter inside your cells’ power plants. But here’s the critical point: MnSOD is only functional when it contains manganese. The mineral isn’t just helpful — it’s structurally essential to the enzyme’s activity [1].
Beyond MnSOD, manganese also acts as a cofactor for arginase (involved in the urea cycle and immune function) and glutamine synthase (important for amino acid metabolism and brain health) [1]. It plays a role in glycosylation — the process by which proteins are decorated with sugar molecules to help them function correctly [1]. And emerging research suggests it may even influence anti-cancer immune pathways through a mechanism called the cGAS-STING pathway [9]. Manganese, in short, is quietly holding up quite a lot.
The clearest evidence of manganese’s role in antioxidant defence comes from depletion studies — removing the mineral and watching what happens. Research published in 2020 using *Drosophila melanogaster* (fruit flies, which share many fundamental cellular mechanisms with humans) found that when dietary manganese was depleted, MnSOD activity dropped significantly [1]. This wasn’t a small effect. The researchers also observed what they described as “cellular iron misregulation” downstream — because reduced MnSOD activity led to superoxide-dependent damage to iron-sulphur clusters inside cells [1].
What’s particularly striking is that the body tried to adapt. Glutamine synthase activity fell, but the body compensated by also reducing glutaminase activity. Glycosyltransferase activity dropped, so lysosomal enzymes that degrade glycoproteins were also reduced [1]. These are elegant compensatory mechanisms — but they are compensations for a system under stress. The body is clever, but it shouldn’t have to work this hard if manganese intake is adequate.
Evidence grade: Early stage — this is animal research in fruit flies, not human trials. But the biochemical mechanisms are fundamentally conserved across species, which makes these findings scientifically meaningful.
One of the more fascinating threads in the manganese research is that this mineral doesn’t just provide raw material for MnSOD — it actively regulates the gene that makes MnSOD in the first place.
A 2011 study using 432 broiler chicks examined what happens to MnSOD gene expression when dietary manganese is supplemented at different levels and from different sources [10]. The findings were clear: compared to chicks fed no supplemental manganese, those receiving manganese had significantly higher MnSOD messenger RNA levels, higher MnSOD protein concentrations, and higher MnSOD enzyme activity in heart tissue (all P < 0.01) [10]. The mechanism involved two transcription factors — Sp1 (which promotes MnSOD gene expression) and AP-2 (which suppresses it). Manganese supplementation increased Sp1 DNA-binding activity and decreased AP-2 binding [10]. In other words, manganese doesn't just feed the enzyme — it turns up the volume on the gene that produces it.
A 2007 study in broilers reinforced this, finding that dietary manganese supplementation produced significantly greater MnSOD activities and MnSOD mRNA levels in breast and leg muscle, alongside lower malondialdehyde content — a marker of lipid oxidation damage — in leg muscle (P < 0.03) [4].
Evidence grade: Early stage to Promising — these are well-designed animal studies with consistent, biologically plausible findings. Human equivalents are lacking, but the gene regulation mechanisms identified are relevant across species.
A 2025 rat study offered a sobering picture of what manganese deficiency looks like at a systemic level [14]. In this controlled experiment, 24 male Wistar rats were divided into three groups: adequate manganese, manganese-deficient, and nano-manganese supplemented. The manganese-deficient group showed significantly lower levels of dopamine and serotonin — key neurotransmitters for mood, motivation and cognitive function (P < 0.001 compared to controls) [14]. They also showed disrupted gut health markers: altered short-chain fatty acid (SCFA) concentrations, and changed caecal bacterial enzyme activity [14].
Interestingly, the nano-manganese group also showed lower dopamine and serotonin compared to controls, alongside altered gut parameters — suggesting that both deficiency and an unusual form of excess can disrupt normal physiology [14]. This is a useful reminder that with trace minerals, balance matters: manganese is not a case of “more is always better.”
Evidence grade: Early stage — rat study with small groups (n=8 per group). Human data on the neurotransmitter-manganese link is not available from these studies. But the findings point to a plausible systemic role worth watching.
Beyond dietary manganese, researchers have been exploring whether manganese-containing compounds can be used therapeutically — essentially creating synthetic MnSOD mimics to deliver antioxidant protection where it’s needed most.
A 2015 review highlighted the story of mangafodipir (MnDPDP), originally developed as an MRI contrast agent, which was discovered to have SOD-mimetic activity — meaning it could perform the same reactive oxygen species neutralising function as MnSOD [5]. This has been tested as an adjunct to chemotherapy and to percutaneous coronary intervention (heart procedures) in human patients, with what the researchers describe as “promising results” [5]. A refined compound, Calmangafodipir, was being explored in a Phase II clinical trial for metastatic colorectal cancer at the time of publication [5].
A 2023 study probed manganese complexes for their ability to scavenge reactive species, finding that certain manganese compounds reduced lipid peroxidation at nanomolar concentrations in ex-vivo models [13]. A separate 2022 paper explored manganese dioxide nanoparticles for their ability to neutralise hydrogen peroxide in neuroblastoma cells, supporting mammalian cells against oxidative stress [6].
Evidence grade: Promising (for pharmaceutical manganese compounds) / Early stage (for dietary implications) — the therapeutic compound research is fascinating and has reached early human trials, but these are specialist medical applications, not direct arguments for dietary supplementation.
The most directly human-relevant study in this review comes from 2003: a randomised, double-blind, placebo-controlled trial of 98 adults in demanding jobs who consumed a test drink daily for four weeks [15]. The drink contained a combination of antioxidants including beta-carotene, alpha-tocopherol, ascorbic acid, pyridoxine, magnesium, manganese (0.2 mg per 100ml), zinc, copper and selenium, alongside the probiotic *Lactobacillus plantarum* 299v [15].
After four weeks, plasma total antioxidant capacity increased by 7% in the supplemented group compared to placebo (P < 0.05), and selenium status improved significantly [15]. The limitation here is obvious: this was a combination product, so it is impossible to attribute the antioxidant benefit specifically to manganese. It may well have been the selenium, the vitamin E, or the synergistic effect of the whole formula. But the study does show that a real-world antioxidant strategy, including manganese alongside other nutrients, produced measurable improvements in antioxidant capacity in humans in just four weeks [15].
Evidence grade: Promising — but for a combination formula, not manganese alone. Sample size of 98 is modest; duration of four weeks is short. Manganese’s individual contribution cannot be isolated from this data.
A 2025 study added an intriguing dimension to the manganese story [8]. Research published in *Antioxidants* examined whether prophylactic dietary manganese feeding could protect *Drosophila* against ionising radiation — a model used to study radiation damage more broadly. The study found that manganese was “critical for radioresistance” across a range of organisms, and that dietary manganese influenced SOD2 (the fly equivalent of MnSOD) activity and lifespan outcomes following radiation exposure [8].
This connects to a broader body of work suggesting that MnSOD’s role as an antioxidant is not just about everyday metabolic ROS, but about protecting cells against acute oxidative insults — including radiation damage [8].
Evidence grade: Early stage — Drosophila research; not directly applicable to humans without further trials. But the consistent finding across multiple model organisms that manganese underpins antioxidant radioresistance is scientifically coherent.
Let’s be honest about the significant gaps here, because this research picture — while scientifically coherent — is not complete.
Almost all the mechanistic research is in animals. The majority of studies on manganese and MnSOD are in fruit flies, chickens, piglets, salmon, lambs and rats [1][3][4][7][10][11][12][14]. These are well-designed experiments and the biology they reveal is relevant, but we cannot simply assume the same dose-response relationships or outcomes apply in adult humans.
The one human RCT used a multi-ingredient formula. The 2003 human trial — the closest thing to direct human evidence here — cannot tell us what manganese alone does, because it was part of a complex antioxidant drink with selenium, vitamins C and E, and a probiotic [15]. Manganese’s individual contribution is genuinely unknown.
The optimal human dose is not established by this research. The animal studies use a wide range of doses, and different forms of manganese (inorganic sulphate vs. various organic complexes) show different bioavailability and effectiveness in different tissues [4][10][11]. These nuances have not been studied in humans.
The balance between deficiency and toxicity is real and important. Several studies make clear that excess manganese causes toxicity — neurodegeneration in humans and in animal models [1][9]. The rat study suggests that even unusual forms of supplementation (nano-manganese) can disrupt neurotransmitter levels [14]. Manganese is not a mineral to megadose — the therapeutic window matters.
The cGAS-STING pathway and cancer-related findings are very early. The 2025 review on manganese and cancer immunity is intellectually fascinating, but this is a research direction, not a clinical recommendation [9].
Here’s what a sensible, well-informed person should actually take from all of this.
Manganese is a trace mineral that your body genuinely needs — and its most important job is to power MnSOD, your mitochondria’s primary antioxidant enzyme. Without enough manganese, that enzyme’s activity drops, and your cells’ ability to neutralise the reactive oxygen species generated by normal energy metabolism is compromised [1][10]. This isn’t speculative; it’s well-established biochemistry, even if the human clinical trial evidence remains thin.
The good news is that manganese deficiency is relatively uncommon in people eating a varied diet. Whole grains, nuts, seeds, legumes, leafy vegetables and tea are all reasonable sources. Most multivitamins and broad-spectrum mineral supplements include manganese, typically at doses in the 1–3mg range — which aligns with the kind of exposure used in combination antioxidant formulas [15].
The practical approach:
1. Eat a varied whole-food diet. This is the single most effective way to ensure adequate manganese intake alongside the full spectrum of cofactors (selenium, zinc, copper, vitamins C and E) that work alongside it [15].
2. If you take a quality multivitamin or broad-spectrum antioxidant supplement that includes manganese, you’re likely covered. The human study showing measurable antioxidant benefit used a combination formula including manganese at realistic doses [15]. A good multi provides this kind of synergistic cover without singling out any one mineral to overdose.
3. Don’t megadose manganese separately. Unlike water-soluble vitamins where excess is excreted harmlessly, manganese accumulates — particularly in the brain — and excess is genuinely neurotoxic [1][9]. This is one trace mineral where “more is better” logic does not apply. Stick to doses in the range found in reputable supplements (1–5mg/day) and do not supplement with additional standalone manganese unless you have a specific clinical reason to do so.
4. Think of manganese as part of a system, not a standalone supplement. The research consistently shows it working in concert with other nutrients and enzymes. The goal is not to optimise manganese in isolation — it’s to ensure your antioxidant defence network has all the raw materials it needs.
The science of manganese and antioxidant defence is genuinely interesting, scientifically coherent, and practically actionable — even if the human clinical trial evidence is not yet where we’d like it to be. What we know is enough to say: don’t ignore it, don’t overdose it, and make sure your overall nutrition strategy includes it.
[1] No Title Available (2020). Manganese depletion and Sod2 activity in *Drosophila melanogaster* — adaptive intestinal responses to manganese deficiency. DOI: 10.1039/c9mt00218a | https://pubmed.ncbi.nlm.nih.gov/31799578/
[2] Manganese-methionine chelate improves antioxidant activity, immune system and egg manganese enrichment in the aged laying hens (2023). https://pubmed.ncbi.nlm.nih.gov/36409287/
[3] Effects of a manganese complex with lysine and glutamic acid on growth performance, manganese deposition, and emission, antioxidant capacity and metacarpal strength in weaned piglets (2024). https://pubmed.ncbi.nlm.nih.gov/38795007/
[4] Effect of manganese supplementation and source on carcass traits, meat quality, and lipid oxidation in broilers (2007). https://pubmed.ncbi.nlm.nih.gov/17040939/
[5] No Title Available (2015). MnSOD mimetic activity of mangafodipir and Calmangafodipir — SOD mimetics in cancer and cardiac intervention. DOI: 10.1016/j.drudis.2014.11.008 | https://pubmed.ncbi.nlm.nih.gov/25463039/
[6] No Title Available (2022). Manganese dioxide nanoparticles and antioxidant defence in neuroblastoma cells. DOI: 10.1039/d2tb00393g | https://pubmed.ncbi.nlm.nih.gov/35674248/
[7] No Title Available (2025). Review: Manganese supplementation in fish and crustaceans — growth, antioxidant defence and enzyme activity. DOI: 10.1016/j.jtemb.2025.127813 | https://pubmed.ncbi.nlm.nih.gov/41448063/
[8] Prophylactically Feeding Manganese to *Drosophila* (2025). Dietary manganese and radioresistance — SOD2, lifespan and ionising radiation protection. DOI: 10.3390/antiox14020134 | https://pubmed.ncbi.nlm.nih.gov/40002321/ | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11851552/
[9] No Title Available (2025). Manganese metabolism, mitochondrial oxidative stress, MnSOD activity and cancer immunity via the cGAS-STING pathway — a review. DOI: 10.1017/S0954422425100139 | https://pubmed.ncbi.nlm.nih.gov/40526045/
[10] Dietary manganese modulates expression of the manganese-containing superoxide dismutase gene in chickens (2011). https://pubmed.ncbi.nlm.nih.gov/21169227/
[11] Dietary manganese source does not affect Mn, Zn and Cu tissue deposition and the activity of manganese-containing enzymes in lambs (2016). https://pubmed.ncbi.nlm.nih.gov/27267351/
[12] Evaluation of the Effect of Dietary Manganese on the Intestinal Digestive Function, Antioxidant Response, and Muscle Quality in Coho Salmon (2024). DOI: 10.1155/2024/9335479 | https://pubmed.ncbi.nlm.nih.gov/39555549/ | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11535279/
[13] Scavenging of reactive species probed by EPR and ex-vivo nanomolar reduction of lipid peroxidation of manganese complexes (2023). https://pubmed.ncbi.nlm.nih.gov/36402588/
[14] No Title Available (2025). Manganese deficiency and nano-manganese supplementation in Wistar rats — effects on fat metabolism, gut health, dopamine and serotonin. DOI: 10.2147/NSA.S494533 | https://pubmed.ncbi.nlm.nih.gov/39981122/ | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11840336/
[15] Influence of a drink containing different antioxidants and *Lactobacillus plantarum* 299v on plasma total antioxidant capacity, selenium status and faecal microbial flora (2003). DOI: 10.1080/0963748031000091964 | https://pubmed.ncbi.nlm.nih.gov/12850889/
This article is for informational purposes only and does not constitute medical advice. Food supplements should not be used as a substitute for a varied and balanced diet and healthy lifestyle. If you are pregnant, breastfeeding, taking medication or have a medical condition, consult your doctor before taking any supplement. These statements have not been evaluated by the Food and Drug Administration (FDA) or the Medicines and Healthcare products Regulatory Agency (MHRA). This product is not intended to diagnose, treat, cure, or prevent any disease.
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