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Most supplements marketed for inflammation in the UK are backed by thin evidence, overblown claims, or studies done in cells and mice that never translated to humans. A few are different. Vitamin C, for instance, contributes to the protection of cells from oxidative stress [GB-NHC] — a mechanism directly relevant to inflammatory load. This piece works through the primary literature on the ingredients that actually have human data worth discussing.

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What the evidence actually shows\n

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The honest starting point: inflammation is not a single thing. It's a spectrum of signalling processes — acute, chronic, low-grade — and the research on supplements tends to conflate them badly. A study showing a compound may reduce a cytokine marker in hospitalised patients tells you almost nothing about what it does in a healthy 38-year-old who sits at a desk too long.

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That said, some signals are consistent enough to take seriously. Fink et al. (2025) tested a plant-based supplement combination against markers of oxidative stress and inflammation in a controlled trial, finding significant effects on immune response markers — though the compound nature of the intervention makes isolating individual ingredients difficult. It's useful signal, not proof of mechanism.

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On the ageing side of the equation, Dugan et al. (2023) published a useful framing piece on what they call \"inflammaging\" — the slow, low-grade inflammatory drift that accumulates with age and sits upstream of most chronic disease risk. The argument is that targeting this drift, rather than acute inflammatory episodes, is where nutritional interventions may have the most traction. I find this framing more useful than the typical \"anti-inflammatory supplement\" marketing language.

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And there's a cautionary note worth making early: Li et al. (2025) showed that supplement-driven iron overload may accelerate inflammatory biomarker profiles — a reminder that supplementation without specificity can make things worse, not better. More isn't more.

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What's actually happening biologically

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Inflammation is your immune system's signalling language. When a cell detects damage or a pathogen, it releases pro-inflammatory cytokines — IL-6, TNF-α, NF-κB pathway activation — to recruit immune cells and initiate repair. That's the acute process, and it's supposed to happen. The problem is when the resolution phase fails.

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Fredman (2020) makes the point that inflammation resolution isn't passive — it's an active biological process driven by specialised pro-resolving mediators (SPMs), including lipoxins and resolvins. If the resolution machinery is impaired, low-grade inflammation persists. This is the biology that connects oxidative stress, mitochondrial dysfunction, and systemic inflammatory load.

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Oxidative stress is the thread that runs through most of this. Reactive oxygen species (ROS) accumulate when antioxidant defences are outpaced by cellular damage — from exercise, poor sleep, processed food, or simply getting older. ROS directly activate NF-κB, one of the master switches for pro-inflammatory gene expression. So compounds that support antioxidant capacity are working on a real upstream lever, not a vague wellness concept.

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Vitamin C contributes to the protection of cells from oxidative stress [GB-NHC]. That's not marketing language — it's a statement about a well-characterised mechanism: ascorbate donates electrons to neutralise free radicals and regenerates other antioxidants, including vitamin E and glutathione. Glutathione, in turn, is the cell's primary intracellular antioxidant, and its depletion is strongly associated with elevated inflammatory markers in older adults — a connection that Kumar et al. (2023) studied in a trial examining glycine and N-acetylcysteine supplementation in older adults, where research suggests this combination may improve glutathione status and related oxidative stress markers.

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Dosing: what the clinical evidence supports

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Dose matters more than almost any other variable, and it's where most UK supplements quietly fall short. Here's what the primary literature actually supports for the most relevant ingredients:

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Vitamin C

The GB-NHC authorised claim for immune function is met at ≥15 mg/day — a low bar that essentially any supplement clears. But the research on oxidative stress and inflammatory markers tends to use 500 mg–1,000 mg daily. Wang et al. (2025) noted that inflammation itself alters circulating concentrations of water-soluble vitamins, meaning people with higher inflammatory load may have higher requirements than the standard RDA suggests. The KōJō Daily Formula delivers 500 mg crystalline vitamin C — at the lower end of the research-grade range, but meaningfully above token-dose territory.

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Aged Garlic Extract

Most RCTs on aged garlic extract use 600 mg–1,200 mg daily. The human data on inflammatory markers is preliminary — large-scale trials are limited, and I'd be overstating it to claim the evidence base is settled. For more on what the research does and doesn't show, the piece on aged garlic extract benefits: what the evidence shows goes deeper.

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Olive Leaf Extract, Grape Seed Extract, Pine Bark Extract

These polyphenol-rich extracts have mechanistic plausibility — they interact with NF-κB signalling and may support antioxidant enzyme activity — but the human RCT data is thin across the board. Research is ongoing, and I won't overstate what's there. The doses used in trials vary widely: olive leaf extract studies have used 500 mg–1,000 mg; grape seed extract trials commonly use 150 mg–300 mg; pine bark (pycnogenol) studies range from 100 mg–200 mg. These are the ranges where effects have been observed in small trials, not definitive therapeutic thresholds.

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Glycine

Kumar et al. (2023) used 1.33 mmol/kg/day of glycine (roughly 8 g for a 70 kg adult) in older participants over 16 weeks, with research suggesting improvements in glutathione status and oxidative stress markers at that dose. That's a higher dose than most supplement formulas provide. Glycine's role in glutathione synthesis is well-characterised biochemically, but large-scale human trials specifically on inflammatory outcomes remain limited.

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The inflammaging angle: why age changes the picture

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If you're in your 30s or older and wondering why inflammation keeps coming up in longevity conversations, Dugan et al. (2023) is worth reading in full. The short version: as the body ages, the immune system shifts towards a pro-inflammatory baseline. Senescent cells accumulate and secrete inflammatory mediators. Mitochondrial function declines. Antioxidant capacity falls. The result is a slow background hum of immune activation that doesn't feel like anything acutely but correlates strongly with cardiovascular risk, cognitive decline, and metabolic dysfunction over decades.

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This is why I'm more interested in the chronic, low-grade picture than acute inflammation from exercise or illness. The supplement-for-inflammation conversation in the UK tends to focus on joint pain and post-workout recovery — both legitimate — but the longer-term inflammatory drift question is arguably more important and less well-served by the current market.

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For a broader look at which daily supplements have the most consistent human evidence behind them, the article on immune support supplement UK daily: what actually works covers the full picture.

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Plant polyphenols: promising but overhyped

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The UK supplement market is saturated with polyphenol products — resveratrol, quercetin, curcumin, pine bark, grape seed — all positioned around inflammation. The mechanistic story is real: polyphenols do interact with NF-κB, Nrf2, and other inflammatory signalling pathways in cell studies. The human translation is messier.

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Fink et al. (2025) found significant effects on oxidative stress and inflammation markers with a plant-based supplement combination, which is encouraging. But \"significant effects on markers\" is not the same as clinical outcomes — reduced pain, fewer sick days, lower cardiovascular risk. That gap matters.

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Curcumin is probably the most studied polyphenol for inflammation. The bioavailability problem is well-documented — standard curcumin is poorly absorbed, and most trials use enhanced delivery forms (phospholipid complexes, nanoparticles, piperine combinations). Results in RCTs are mixed. Some show reductions in CRP and IL-6; others show nothing. I don't include it in the KōJō formula partly because the form matters so much that a powder delivery is probably not the right vehicle.

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Grape seed extract and pine bark extract have smaller but cleaner evidence bases. Both are rich in oligomeric proanthocyanidins (OPCs) and have shown some signal on endothelial function and oxidative stress markers in small trials. Research is ongoing, and large-scale human trials are limited — I include them at evidence-grade doses, but with open eyes about what the data doesn't yet confirm.

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What about taurine and glycine specifically?

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These two amino acids are interesting precisely because they're not usually framed as \"anti-inflammatory\" supplements — they're positioned around cellular function, bile acid conjugation, and neurotransmitter activity. But the connection to inflammatory biology is real.

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Taurine is one of the most abundant free amino acids in immune cells. It's involved in regulating neutrophil activity and may modulate the production of inflammatory mediators — though the human data on this specific pathway is limited, and I'd be overstating it to claim taurine is a proven anti-inflammatory compound in healthy adults. Research is ongoing.

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Glycine is more interesting from an inflammation perspective. It's a precursor to glutathione (alongside cysteine and glutamate), and glutathione depletion is mechanistically linked to NF-κB activation. Kumar et al. (2023) showed that supplementing glycine alongside N-acetylcysteine in older adults may improve glutathione status — and the downstream effects on oxidative stress markers were measurable. Whether that translates to meaningful inflammatory outcomes at population scale is still being worked out.

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What to look for — and what to avoid — when buying in the UK

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A few things I check before buying any supplement in this category:

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\nDose transparency: If the label lists ingredients without individual weights, the dose is probably too low to matter. Full disclosure is non-negotiable.
\nForm specificity: Curcumin without a bioavailability enhancer, magnesium oxide instead of glycinate or malate, vitamin C as ascorbyl palmitate in a fat-soluble product — form determines absorption. Ask what form.
\nEvidence tier: Is the claim based on human RCTs, animal studies, or in vitro work? These are not equivalent. Most polyphenol claims are built on the latter two.
\nInteraction with existing conditions: Some compounds that interact with inflammatory pathways also interact with anticoagulants, immunosuppressants, or thyroid medication. Worth knowing before you add anything.

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The immune support supplement UK daily: what holds up piece goes through this filtering process in more detail, if you want the longer version.

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Frequently asked questions

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Which supplement has the strongest evidence for inflammation in the UK?

Vitamin C has the clearest regulatory standing — it contributes to the protection of cells from oxidative stress [GB-NHC] at doses achievable through supplementation. For broader inflammatory marker research, plant-based combinations show some signal, as Fink et al. (2025) demonstrated, though isolating single ingredients from combination studies is difficult.

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Is low-grade inflammation something a supplement can actually address?

Possibly, but the evidence is more promising for some compounds than others. Dugan et al. (2023) argue that the chronic inflammatory drift associated with ageing is a legitimate target for nutritional intervention, though they're clear that lifestyle factors — sleep, diet quality, exercise — sit upstream of any supplement effect.

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Does glycine help with inflammation?

Glycine is a glutathione precursor, and glutathione depletion is linked to elevated oxidative stress and inflammatory signalling. Kumar et al. (2023) found that glycine supplementation alongside N-acetylcysteine may improve glutathione status in older adults. Whether this translates to clinically meaningful anti-inflammatory outcomes in healthy populations hasn't been established in large trials.

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Can taking too many supplements make inflammation worse?

Yes, in specific cases. Li et al. (2025) showed that supplement-driven iron overload may accelerate inflammatory biomarker profiles. Excess iron generates reactive oxygen species through Fenton chemistry — a direct pro-inflammatory mechanism. It's one of the clearest examples of supplementation causing measurable harm rather than benefit.

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How does vitamin C relate to inflammation specifically?

Vitamin C contributes to the protection of cells from oxidative stress [GB-NHC] — and oxidative stress is a direct activator of NF-κB, one of the primary pro-inflammatory transcription factors. Wang et al. (2025) noted that inflammation itself alters circulating vitamin C concentrations, suggesting requirements may be higher under inflammatory conditions than standard RDAs reflect.

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Are polyphenol supplements worth taking for inflammation?

The mechanistic case is plausible — polyphenols interact with NF-κB and Nrf2 signalling in cell studies. Human RCT data is more mixed. Some trials show reductions in CRP or IL-6; others don't. Fink et al. (2025) found positive effects with a plant-based combination, but compound interventions make it hard to attribute effects to specific ingredients.

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My honest take

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I started thinking seriously about inflammation when I was building the KōJō formula. Not because I had an inflammatory condition — I didn't — but because the more I read about the biology of ageing, the more it became clear that chronic low-grade inflammatory drift is probably the most underappreciated thing happening in most people's bodies from their 30s onwards.

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The problem with the UK supplement market in this space is that it's dominated by either single-ingredient products at inadequate doses, or kitchen-sink blends with 30 ingredients at doses too small to do anything. Neither approach takes the evidence seriously.

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What I landed on for the formula was a smaller number of ingredients at doses that match or approach what the research actually used — vitamin C at 500 mg, aged garlic extract at 600 mg, glycine at 2,000 mg, olive leaf extract at 500 mg. Not because I think any of these are magic. But because if the evidence points to a dose range, there's no point in being below it to save money on formulation.

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I'm genuinely uncertain about some of this. The polyphenol evidence is real but incomplete. The glycine-glutathione-inflammation chain is mechanistically coherent but not proven at scale in healthy adults. I don't think anyone should buy a supplement expecting it to fix inflammation — that framing is wrong. But I do think there's a reasonable case for supporting the biological systems that keep inflammatory signalling in check, particularly as you get older. That's the honest version of what I'm trying to do.

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The inflammation resolution biology that Fredman (2020) describes — active, SPM-driven resolution rather than passive cessation — is one of the most interesting areas I've read in the last few years. It suggests the question isn't just \"how do inflammatory signals get reduced\" but \"how does the body support its own resolution machinery.\" That's a different research agenda, and I think it's the right one. The supplement industry hasn't caught up to it yet.

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This article is for informational purposes only and does not constitute medical advice. Consult your healthcare provider before starting any supplement regimen.

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References (10 studies)

\nKumar et al. (2023) — Supplementing Glycine and N-Acetylcysteine (GlyNAC) in Older Adults Improves Glutathione Deficiency, Oxidative Stress, Mitochondrial Dysfunction, Inflammation, Physical Function, and Aging Hallmarks. PMID 35975308
\nDugan et al. (2023) — Inflammaging as a target for healthy ageing. PMID 36735849
\nLi et al. (2025) — Supplement-driven iron overload accelerates phenotypic aging via inflammatory biomarkers: Potential counteraction through nutritional strategies. PMID 40570516
\nWang et al. (2025) — Individualized supplement of water-soluble vitamins: the influence of inflammation and renal function on circulating concentrations. PMID 40787467
\nFink et al. (2025) — A Plant-Based Dietary Supplement Exhibits Significant Effects on Markers of Oxidative Stress, Inflammation, and Immune Response. PMID 40508019
\nFredman (2020) — Next-Gen Inflammation Resolution. PMID 31895654
\nYe et al. (2023) — Comparative Effects of Different Nutritional Supplements on Inflammation, Nutritional Status, and Clinical Outcomes in Critically Ill Patients. PMID 37375676
\nCesar et al. (2022) — Nutraceutical Eriocitrin (Eriomin) Reduces Hyperglycemia by Increasing Glucagon-Like Peptide 1 and Downregulates Systemic Inflammation. PMID 35796695
\nShay et al. (2010) — Alpha-lipoic acid as a dietary supplement: molecular mechanisms and therapeutic potential. PMID 19664690
\nClayton et al. (2021) — Palmitoylethanolamide: A Natural Compound for Health Management. PMID 34069940

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