Do polyphenols work?

Overall Effectiveness Rating for Polyphenols

The overall effectiveness rating for polyphenols is 1.5 out of 3. This rating means there is some evidence that using polyphenols may lead to positive results. This rating also means that some evidence does not back up all claims. Below you can find individual ratings for specific claims.

Overall Confidence Rating for Polyphenols

There are 3 studies in the database on polyphenols; the confidence rating is 20. A score above 80 means the effectiveness rating for this supplement is reliable. A score under 80 means there is insufficient evidence to ensure a reliable effectiveness rating. Note, this rating is for polyphenols as a whole. There are also individual ratings for the claims below.

Individual Claims

The overall ratings above do no necessarily reflect each claim about polyphenols. Individual claims can have higher or lower ratings. For example, some supplements may have a lot of backing for one claim, but be completely useless for another. Click on claims below for more information.

Performance Claims Effectiveness Rating Confidence Rating
improve cycling performance
decrease fatigue
increase strength
improve cycling sprint performance


Title of Study
Impact of polyphenol antioxidants on cycling performance and cardiovascular function
Impact of Polyphenol Supplementation on Acute and Chronic Response to Resistance Training
Supplementation with a Polyphenol-Rich Extract, PerfLoad®, Improves Physical Performance during High-Intensity Exercise: A Randomized, Double Blind, Crossover Trial