Which supplement works better to improve cognitive ability: l-theanine or vitamin b12?

Ratings at a Glance

Supplement	Effectiveness Rating	Confidence Rating
L-Theanine
Vitamin B12

Effectiveness Rating: L-Theanine vs Vitamin B12

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. The evidence shows l-theanine is better than vitamin b12 in its ability to improve cognitive ability. L-Theanine should provide some positive results while vitamin b12 will not.

Confidence Rating: L-Theanine vs Vitamin B12

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 vitamin b12 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.