Which supplement works better to improve cognitive ability: l-theanine or tyrosine?

Ratings at a Glance

Supplement	Effectiveness Rating	Confidence Rating
L-Theanine
Tyrosine

Effectiveness Rating: L-Theanine vs Tyrosine

The effectiveness rating is a measure of the supplements' ability to improve cognitive ability. This rating answers the question of whether or not a supplement does what it claims. Both l-theanine and tyrosine have good (but not great) evidence showing they may be able to improve cognitive ability. Both supplements should provide some positive results.

Confidence Rating: L-Theanine 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.

Both l-theanine and tyrosine 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.