Which supplement works better to improve recovery: arginine or leucine?

Ratings at a Glance

Supplement	Effectiveness Rating	Confidence Rating
Arginine
Leucine

Effectiveness Rating: Arginine vs Leucine

The effectiveness rating is a measure of the supplements' ability to improve recovery. This rating answers the question of whether or not a supplement does what it claims. Both arginine and leucine have good (but not great) evidence showing they may be able to improve recovery. Both supplements should provide some positive results.

Confidence Rating: Arginine vs Leucine

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.

Arginine's confidence rating is higher than leucine's. This means arginine's effectiveness rating from above is more valid. This does not necessarily mean that arginine works better, it simply means the evidence (included in this database) backing up arginine is more established.