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

Ratings at a Glance

Supplement	Effectiveness Rating	Confidence Rating
Astaxanthin
Caffeine Anhydrous

Effectiveness Rating: Astaxanthin vs Caffeine Anhydrous

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 to improve cardiovascular endurance is much better than the evidence backing up astaxanthin. Caffeine Anhydrous should provide positive results while astaxanthin will not.

Confidence Rating: Astaxanthin vs Caffeine Anhydrous

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 astaxanthin and caffeine anhydrous 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.