Antioxidant Protection
Powerful antioxidant defense against free radicals, oxidative stress, and cellular damage.
TL;DR
Antioxidant protection means keeping oxidative damage in balance, not eliminating it. Food-based polyphenols and adequate selenium, zinc and vitamin C support endogenous defences; high-dose isolated antioxidant supplements can blunt exercise adaptation and, in some trials, worsen outcomes.
Why It Matters
Reactive oxygen species are signalling molecules as well as damage agents. The body relies on glutathione, superoxide dismutase and catalase, all of which need cofactors (selenium, zinc, manganese, cysteine). Large trials of high-dose isolated antioxidants — beta-carotene in smokers, vitamin E for cardiovascular prevention — showed no benefit and in some cases harm. The clinical target is sufficiency and dietary polyphenol variety, not maximal suppression.
How to Measure
Routine oxidative stress panels (8-OHdG, F2-isoprostanes, oxidised LDL) are available but poorly standardised and rarely change management. More useful: serum selenium or glutathione peroxidase activity, plasma zinc, vitamin C, and hs-CRP as a proxy for inflammatory load. Dietary polyphenol intake is best estimated from a food diary — servings of coloured produce, tea, coffee, olive oil, cocoa.
Biomarkers
Target Ranges
Serum selenium
90-120 mcg/L
Plasma zinc
70-120 mcg/dL
Plasma vitamin C
>50 micromol/L
hs-CRP
<1.0 mg/L
Optimization Protocol
Prioritise dietary breadth: 6-8 servings daily of varied coloured produce, plus tea, extra-virgin olive oil and herbs. Correct measured deficiencies of selenium, zinc or vitamin C at ordinary doses. Where a targeted agent is warranted, NAC (600-1200 mg daily) supports glutathione synthesis and curcumin phytosome (500-1000 mg daily) modulates Nrf2 signalling. Avoid megadose vitamin C or E around training — several trials show blunted mitochondrial and strength adaptation.
Lifestyle Levers
- •Varied coloured produce daily
- •Regular moderate exercise (hormetic stress)
- •Stopping smoking
- •Limiting alcohol
- •Sleep sufficiency
- •Reducing ultra-processed food intake
- •Sun protection for skin oxidative load
Supporting Supplements
Vitamin E
Vitamin E is a genuine lipid-phase antioxidant in vitro, but supplementation has repeatedly failed to translate to health benefit.
Quercetin
Quercetin is a potent antioxidant in vitro, but poor bioavailability means human trials show smaller and less consistent effects on oxidative stress markers than laboratory data suggest.
Selenium
Selenium underpins the bodys core antioxidant enzyme systems, and repletion measurably improves antioxidant capacity in deficient people.
Alpha Lipoic Acid (ALA)
ALA is an unusually versatile antioxidant - both water and fat soluble - and reliably lowers oxidative-stress markers in humans.
Astaxanthin
Astaxanthin is a potent membrane-spanning antioxidant with consistent effects on oxidative stress biomarkers.
N-Acetyl Cysteine (NAC)
One of the most mechanistically solid antioxidant supplements available.
Taurine
Taurine reduces oxidative stress markers in humans, though it works indirectly rather than as a classical radical scavenger.
Curcumin
Good mechanistic support; form selection (with piperine or liposomal) is make-or-break.
Green Tea Extract (EGCG)
Green tea catechins reliably improve oxidative stress biomarkers in human trials.
Elderberry
Elderberry is rich in anthocyanins with antioxidant activity in vitro, but human antioxidant outcomes are unmeasured.
Lutein
Lutein is a well-characterised carotenoid antioxidant that concentrates in the retina and reliably raises macular pigment.
Vitamin C
Vitamin C is the body's primary water-soluble antioxidant and regenerates vitamin E — but supplementing above repletion does not improve health outcomes.
Resveratrol
Antioxidant biomarker changes are inconsistent across human studies.
CoQ10
Solid mechanistic and clinical support, particularly for adults over 40 and statin users.
Ginkgo Biloba
Ginkgo flavonoids demonstrate antioxidant activity in laboratory and marker studies, but the clinical relevance is unclear.
Zinc
Zinc supports the body's own antioxidant defences rather than acting as a direct radical scavenger, and supplementation improves oxidative stress markers mainly in older adults and those with low zinc status.
Melatonin
Take it for sleep timing, not as an antioxidant strategy.
PQQ
PQQ is a redox cofactor with strong laboratory antioxidant credentials and minimal human data.
Fisetin
Fisetin has strong antioxidant activity in laboratory models but essentially no human data.
Pterostilbene
Pterostilbene raises antioxidant capacity in preclinical work, with only indirect human confirmation.
Supporting Research
Frequently Asked Questions
Typical Timeframe
Plasma nutrient levels normalise within 4-8 weeks of adequate intake. Downstream markers such as hs-CRP shift over 8-12 weeks. Structural benefits are long-horizon and not measurable on an individual timescale.
Research Summary
My Notes
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This information is for educational purposes only. Always consult a healthcare professional before starting any supplement regimen.