Which supplement works better to improve cognitive ability: docosahexaenoic acid (dha) or iron?

Ratings at a Glance

Supplement	Effectiveness Rating	Confidence Rating
Docosahexaenoic Acid (DHA)
Iron

Effectiveness Rating: Docosahexaenoic Acid (DHA) 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 to improve cognitive ability is much better than the evidence backing up docosahexaenoic acid (dha). Iron should provide positive results while docosahexaenoic acid (dha) will not.

Confidence Rating: Docosahexaenoic Acid (DHA) 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.

Docosahexaenoic Acid (DHA)'s confidence rating is higher than iron's. This means docosahexaenoic acid (dha)'s effectiveness rating from above is more valid. This does not necessarily mean that docosahexaenoic acid (dha) works better, it simply means the evidence (included in this database) backing up docosahexaenoic acid (dha) is more established.