In vitro and animal research have suggested far-reaching benefits of spirulina, including antioxidant, anti-inflammatory, neuroprotective, anti-cancer, anti-viral, immune-modulating, hypoglycemic (blood-sugar-lowering), and cardioprotective properties.[1] However, only a few of these effects have been observed in human clinical trials.
Clinical trials suggest that people who supplement with spirulina may see small but positive effects on various aspects of their cardiometabolic health, including improved lipid profiles,[1][2] decreased blood pressure (particularly in those with high blood pressure),[3] small reductions in body weight,[4][5] and decreased fasting glucose.[2][6]
Spirulina is often touted as a potent antioxidant and anti-inflammatory supplement. While this certainly is the case in pre-clinical research, human clinical trials have been mixed. Spirulina might increase total antioxidant capacity and superoxide dismutase activity, but no clear effects on inflammation have been found.[7][8]