Does Blackcurrant Endurance Exercise Randomized Trial work?

The current Migaku evidence database contains 2 reusable source documents for Blackcurrant Endurance Exercise Randomized Trial. This answer focuses on strength of evidence and what the studies can or cannot prove. - Conclusion Foods rich in polyphenols and nitrate provide trivial benefits for endurance exercise performance, although these effects may be food dependent. [d'Unienville NMA (2021); evidence level 1] - Background Increasing nitric oxide bioavailability may induce physiological effects that enhance endurance exercise performance. [d'Unienville NMA (2021); evidence level 1] - This review sought to evaluate the performance effects of consuming foods containing compounds that may promote nitric oxide bioavailability. [d'Unienville NMA (2021); evidence level 1] - Results During rest, the blackcurrant extract condition was associated with higher heart rate (+6 bpm), cardiac output (+10%), carbohydrate oxidation (+31%), and respiratory exchange ratio (+0.02 units), with lower systemic vascular resistance (-18%) compared with placebo. [Willems MET (2026); evidence level 4] - During the 1-h treadmill run at 50% V˙O2max , the blackcurrant extract condition was associated with higher stroke volume (+9%), cardiac output (+10%), oxygen uptake (+6%), carbohydrate oxidation (+43%), and respiratory exchange ratio (+0.03 units), with lower systemic vascular resistance (-24%) and fat oxidation (-7%) compared with placebo. [Willems MET (2026); evidence level 4] Evidence levels are sorting aids, not final clinical grades. Level 1 usually indicates systematic-review style evidence, level 2 indicates randomized trials or public-health guidance, and lower levels need more cautious wording. This page is educational. People with medical conditions, pregnancy, medication use, or unusual symptoms should ask a qualified clinician before changing supplements, medication, or treatment routines.