Which supplement works better to improve cycling sprint performance: l-citrulline or vitamin d3?

Ratings at a Glance

Supplement	Effectiveness Rating	Confidence Rating
L-Citrulline
Vitamin D3

Effectiveness Rating: L-Citrulline vs Vitamin D3

The effectiveness rating is a measure of the supplements' ability to improve cycling sprint performance. This rating answers the question of whether or not a supplement does what it claims. The evidence backing up l-citrulline to improve cycling sprint performance is much better than the evidence backing up vitamin d3. L-Citrulline should provide positive results while vitamin d3 will not.

Confidence Rating: L-Citrulline 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.

Both l-citrulline and vitamin d3 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.