Which supplement works better to improve cognitive ability: beetroot juice or iron?

Ratings at a Glance

Supplement	Effectiveness Rating	Confidence Rating
Beetroot Juice
Iron

Effectiveness Rating: Beetroot Juice vs Iron

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 beetroot juice is good. Iron should be able to improve cognitive ability more effectively, however both supplements should provide positive results.

Confidence Rating: Beetroot Juice vs Iron

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 beetroot juice and iron 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.