Which supplement works better to improve sports performance: caffeine anhydrous or vitamin d3?

Ratings at a Glance

Supplement	Effectiveness Rating	Confidence Rating
Caffeine Anhydrous
Vitamin D3

Effectiveness Rating: Caffeine Anhydrous vs Vitamin D3

The effectiveness rating is a measure of the supplements' ability to improve sports performance. This rating answers the question of whether or not a supplement does what it claims. The evidence backing up caffeine anhydrous to improve sports performance is much better than the evidence backing up vitamin d3. Caffeine Anhydrous should provide positive results while vitamin d3 will not.

Confidence Rating: Caffeine Anhydrous vs Vitamin D3

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.

Caffeine Anhydrous's confidence rating is higher than vitamin d3's. This means caffeine anhydrous's effectiveness rating from above is more valid. This does not necessarily mean that caffeine anhydrous works better, it simply means the evidence (included in this database) backing up caffeine anhydrous is more established.