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In heart failure patients, 20 mg/day of astaxanthin for 8 weeks raised SOD levels to 156.92 U/mL versus 36.14 U/mL in the placebo group — but the benefit was seen only in this clinical population, not necessarily in healthy people.
This small, double-blind trial suggests astaxanthin can meaningfully boost antioxidant defenses in people with chronic heart failure, but because it's among the first studies on this pairing, the results need replication before they apply broadly.
Heart failure patients who took 20 mg of astaxanthin daily for 8 weeks saw a large increase in superoxide dismutase (SOD), an enzyme that helps neutralize damaging free radicals. The same study also found improvements in other markers of oxidative stress and symptoms like shortness of breath and fatigue, though appetite didn't change, and the results come from a single trial with 80 participants.
Where this fits in the evidence
This is among the first studies we've indexed on Astaxanthin for Increased Antioxidant Enzyme Levels — treat it as an early signal until more research accumulates.
The study
- Randomized Controlled Trial (RCT)
- n = 80
- 2025-10-29
- BMC cardiovascular disorders
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