Researchers looked at how taking polyphenols, which are found in many plants, affects people who perform resistance training. The study analyzed data from 360 participants to see if these supplements helped build more muscle or increase strength compared to training alone or using a placebo.
The results showed only small and uncertain improvements in strength. When looking at muscle mass and muscle shape, the findings were even less clear. Because the data came from a small number of independent trials, the results are not strong enough to make a firm conclusion.
Because the evidence is of low to very low certainty, it is not yet clear if polyphenols provide a reliable extra benefit for muscle growth. People should be aware that the study's findings are not definitive. You should talk with a healthcare provider before starting new supplements to see if they fit your specific fitness goals.
Common questions
Can polyphenols help me build more muscle?
The study found only a small and statistically uncertain increase in strength for those taking polyphenols with resistance training. Because the evidence is of low certainty, it is not yet clear if these supplements provide a reliable benefit for muscle growth or strength.
Is the evidence for these supplements strong?
No, the evidence is currently weak. The study notes a low to very low certainty of evidence because of a limited number of independent trials and other methodological issues. This means the results are not yet firm enough to change standard practices.
What did the study find regarding muscle mass?
The study showed a small, statistically uncertain estimate for muscle quantity and lean mass. The results for direct muscle morphology were even less clear, with an estimate close to zero. These findings are not definitive enough to confirm a clear benefit.
