We aimed to investigate the long-term effect of daily Calanus oil supplementation on maximal oxygen uptake (VO₂max) in healthy 30- to 50-year-old participants. The study was motivated by preclinical studies reporting increased VO₂max and metabolic health with omega-3 rich Calanus oil. In a double-blinded study, 71 participants were randomized to receive 2 g/day of Calanus or ...