Which supplement works better to improve cognitive ability: broccoli extract or iron?

Ratings at a Glance

Supplement	Effectiveness Rating	Confidence Rating
Broccoli Extract
Iron

Effectiveness Rating: Broccoli Extract 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. Both broccoli extract and iron have great evidence backing up their ability to improve cognitive ability. They should both provide positive results.

Confidence Rating: Broccoli Extract 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 broccoli extract 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.