Which supplement works better to improve running performance: phosphorus or tryptophan?

Ratings at a Glance

Supplement	Effectiveness Rating	Confidence Rating
Phosphorus
Tryptophan

Effectiveness Rating: Phosphorus vs Tryptophan

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 shows tryptophan is better than phosphorus in its ability to improve running performance. Tryptophan should provide some positive results while phosphorus will not.

Confidence Rating: Phosphorus vs Tryptophan

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 phosphorus and tryptophan 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.