Which supplement works better to decrease fatigue: l-carnitine or tryptophan?

Ratings at a Glance

Supplement	Effectiveness Rating	Confidence Rating
L-Carnitine
Tryptophan

Effectiveness Rating: L-Carnitine vs Tryptophan

The effectiveness rating is a measure of the supplements' ability to decrease fatigue. This rating answers the question of whether or not a supplement does what it claims. The evidence shows tryptophan is better than l-carnitine in its ability to decrease fatigue. Tryptophan should provide some positive results while l-carnitine will not.

Confidence Rating: L-Carnitine 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 l-carnitine 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.