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

Ratings at a Glance

Supplement	Effectiveness Rating	Confidence Rating
Black Pepper Fruit Extract (Piperine)
L-Citrulline

Effectiveness Rating: Black Pepper Fruit Extract (Piperine) vs L-Citrulline

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 backing up l-citrulline to improve cycling performance is much better than the evidence backing up black pepper fruit extract (piperine). L-Citrulline should provide positive results while black pepper fruit extract (piperine) will not.

Confidence Rating: Black Pepper Fruit Extract (Piperine) vs L-Citrulline

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 l-citrulline 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.