Does iron work?

Overall Effectiveness Rating for Iron

The overall effectiveness rating for iron is 3 out of 3. This rating means there is ample evidence that using iron will lead to positive results.

Overall Confidence Rating for Iron

There are 2 studies in the database on iron; the confidence rating is 20. A score above 80 means the effectiveness rating for this supplement is reliable. A score under 80 means there is insufficient evidence to ensure a reliable effectiveness rating. Note, this rating is for iron as a whole. There are also individual ratings for the claims below.

Products Containing Iron

Products Containing Iron
Pro Pre
Vita JYM
Bucked Up RUT
Full list of all 7 products containing Iron.

Individual Claims

The overall ratings above do no necessarily reflect each claim about iron. Individual claims can have higher or lower ratings. For example, some supplements may have a lot of backing for one claim, but be completely useless for another. Click on claims below for more information.

Performance Claims Effectiveness Rating Confidence Rating
improve running performance

Mental Health Claims Effectiveness Rating Confidence Rating
improve cognitive ability
improve memory
improve mood


Title of Study
Effects of iron and n-3 fatty acid supplementation, alone and in combination, on cognition in school children: a randomized, double-blind, placebo-controlled intervention in South Africa
Randomized, double-blind, placebo-controlled trial of iron supplementation in female soldiers during military training: effects on iron status, physical performance, and mood