Which supplement works better to improve cardiovascular endurance: caffeine anhydrous or peak o2?

Ratings at a Glance

Supplement	Effectiveness Rating	Confidence Rating
Caffeine Anhydrous
Peak O2

Effectiveness Rating: Caffeine Anhydrous vs Peak O2

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. The evidence backing up caffeine anhydrous is great, while the evidence backing up peak o2 is good. Caffeine Anhydrous should be able to improve cardiovascular endurance more effectively, however both supplements should provide positive results.

Confidence Rating: Caffeine Anhydrous vs Peak O2

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 peak o2 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.