Which supplement works better to improve cognitive ability: iron or p-synephrine?

Ratings at a Glance

Supplement	Effectiveness Rating	Confidence Rating
Iron
P-Synephrine

Effectiveness Rating: Iron vs P-Synephrine

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 backing up iron is great, while the evidence backing up p-synephrine is good. Iron should be able to improve cognitive ability more effectively, however both supplements should provide positive results.

Confidence Rating: Iron vs P-Synephrine

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 iron and p-synephrine 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.