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

Ratings at a Glance

Supplement	Effectiveness Rating	Confidence Rating
Caffeine Anhydrous
Glycerol

Effectiveness Rating: Caffeine Anhydrous vs Glycerol

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 glycerol have great evidence backing up their ability to improve cardiovascular endurance. They should both provide positive results.

Confidence Rating: Caffeine Anhydrous vs Glycerol

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.

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