Which supplement works better to improve running performance: beetroot juice or caffeine anhydrous?

Ratings at a Glance

Supplement	Effectiveness Rating	Confidence Rating
Beetroot Juice
Caffeine Anhydrous

Effectiveness Rating: Beetroot Juice vs Caffeine Anhydrous

The effectiveness rating is a measure of the supplements' ability to improve running performance. 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 beetroot juice is good. Caffeine Anhydrous should be able to improve running performance more effectively, however both supplements should provide positive results.

Confidence Rating: Beetroot Juice 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.

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