Which supplement works better to improve cycling performance: tryptophan or tyrosine?

Ratings at a Glance

Supplement	Effectiveness Rating	Confidence Rating
Tryptophan
Tyrosine

Effectiveness Rating: Tryptophan vs Tyrosine

The effectiveness rating is a measure of the supplements' ability to improve cycling performance. This rating answers the question of whether or not a supplement does what it claims. The evidence backing up tryptophan to improve cycling performance is much better than the evidence backing up tyrosine. Tryptophan should provide positive results while tyrosine will not.

Confidence Rating: Tryptophan vs Tyrosine

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.

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