Superoxide Dismutase (SOD · EC 1.15.1.1 · Primary Cellular Antioxidant Enzyme)
| CAS No. | 9054-89-1 |
| Class | Enzyme · Oxidoreductase · Metalloenzyme (Cu/Zn-SOD, Mn-SOD, Fe-SOD) |
| Source | Triticum aestivum (Wheatgrass) — young leaves (primary commercial plant source); also Cucumis melo (melon) — fruit (gliadin-complexed melon SOD) |
| Claim strength | High |
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Superoxide dismutase is the body's primary endogenous antioxidant enzyme — the first line of defence against the superoxide radical (O₂⁻), the most commonly produced reactive oxygen species in cellular metabolism. SOD was first characterised by Irwin Fridovich and Joe McCord at Duke University in 1969. The enzyme's discovery established the mechanistic basis for understanding oxidative stress as a pathological process. SOD levels decline with ageing, which has led to significant interest in exogenous SOD supplementation as an anti-ageing strategy.
SOD for Oxidative Stress Management, Anti-Aging & Exercise Recovery — Evidence
Primary antioxidant enzyme — endogenous role: SOD catalyses the dismutation of superoxide radicals into hydrogen peroxide and oxygen — the first and critical step in the enzymatic antioxidant defence cascade. SOD's biological importance is established by the lethal consequences of complete SOD deletion in animal models. Claim strength: High (endogenous enzyme).
Oral SOD supplementation — bioavailability challenge: SOD is a protein enzyme degraded by digestive proteases in the stomach and small intestine. Encapsulated or gliadin-complexed SOD (such as GliSODin® — melon SOD complexed with wheat gliadin) has demonstrated measurable increases in plasma antioxidant capacity and SOD activity in human trials. Claim strength: Moderate (for protected/encapsulated forms).
Exercise recovery and oxidative stress: Multiple human studies with encapsulated melon SOD document reductions in exercise-induced oxidative stress markers, improvements in fatigue scores, and enhanced antioxidant capacity. Claim strength: Moderate.
Healthy ageing and inflammation: Clinical studies in older adults show reductions in inflammatory biomarkers (CRP, IL-6) and improvements in quality of life scores with oral encapsulated SOD supplementation. Claim strength: Moderate.
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Dosage & Formulator Notes
For oral SOD supplementation, the encapsulated or gliadin-complexed form is critical for bioavailability. GliSODin® and similar protected forms have been studied at doses providing 75–500 IU of SOD activity (typically 20–200mg of standardised extract) per day in human trials. Activity is expressed in units per mg — confirm SOD activity (U/mg or IU/mg) on the CoA alongside weight. Raw SOD powder without protection is unlikely to survive GI transit intact.
Pairs with: Catalase (complementary antioxidant enzyme — SOD produces H₂O₂ which catalase neutralises), Vitamin C and E (synergistic antioxidant combination), CoQ10 (mitochondrial antioxidant stack), glutathione or N-acetylcysteine (comprehensive antioxidant formulation).
Frequently Asked Questions
Why is oral SOD supplementation challenging?
SOD is a protein enzyme rapidly degraded by digestive proteases (pepsin, trypsin, chymotrypsin) in the stomach and small intestine. Without physical protection, most oral SOD activity is destroyed before absorption. Encapsulated, microencapsulated, or gliadin-complexed SOD has demonstrated measurable plasma activity increases in human trials.
What is the difference between Cu/Zn-SOD and Mn-SOD?
There are three major forms: Cu/Zn-SOD (SOD1) in the cytoplasm, Mn-SOD (SOD2) in the mitochondria, and extracellular Cu/Zn-SOD (SOD3). Plant sources including wheatgrass and melon provide Cu/Zn-SOD primarily. The mitochondrial Mn-SOD is particularly critical for protecting energy-producing machinery from oxidative damage.
Does SOD activity decline with ageing?
Yes — endogenous SOD activity declines with biological ageing, associated with increased oxidative damage, accelerated cellular senescence, and higher susceptibility to age-related diseases.
What is GliSODin and is it the best form of SOD for supplementation?
GliSODin is a patented form of melon SOD complexed with wheat gliadin protein for protection from GI degradation. It is the most clinically studied form of oral SOD supplement with demonstrated measurable increases in plasma antioxidant capacity. For formulations requiring clinical evidence of oral bioavailability, GliSODin is the reference standard.
Claim-strength scale – High = multiple human studies; Moderate = a few trials; Emerging = early lab data.
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