Which supplement works better to improve cycling performance: black pepper fruit extract (piperine) or quercetin?

Ratings at a Glance

Supplement	Effectiveness Rating	Confidence Rating
Black Pepper Fruit Extract (Piperine)
Quercetin

Effectiveness Rating: Black Pepper Fruit Extract (Piperine) vs Quercetin

The effectiveness rating is a measure of the supplements' ability to improve cycling performance. This rating answers the question of whether or not a supplement does what it claims. The evidence shows quercetin is better than black pepper fruit extract (piperine) in its ability to improve cycling performance. Quercetin should provide some positive results while black pepper fruit extract (piperine) will not.

Confidence Rating: Black Pepper Fruit Extract (Piperine) vs Quercetin

Another factor to take into account when comparing supplements is the confidence rating. This rating is a measure of how valid each supplement's effectiveness rating is. Remember, the confidence rating is a measure of how much you can trust the effectiveness rating. This rating is based on how many studies are included in the database on a supplement's claims. Ideally, you want a high effectiveness AND confidence rating.

Both black pepper fruit extract (piperine) and quercetin have low confidence ratings. This means neither supplement has an adequate amount of research to back up this claim. A low confidence rating questions the validity of the effectiveness rating.