Which supplement works better to improve cardiovascular endurance: caffeine anhydrous or hmb?

Ratings at a Glance

Supplement	Effectiveness Rating	Confidence Rating
Caffeine Anhydrous
HMB

Effectiveness Rating: Caffeine Anhydrous vs HMB

The effectiveness rating is a measure of the supplements' ability to improve cardiovascular endurance. This rating answers the question of whether or not a supplement does what it claims. Both caffeine anhydrous and hmb have great evidence backing up their ability to improve cardiovascular endurance. They should both provide positive results.

Confidence Rating: Caffeine Anhydrous vs HMB

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 caffeine anhydrous and hmb 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.