Which supplement works better to improve running performance: iron or taurine?

Ratings at a Glance

Supplement	Effectiveness Rating	Confidence Rating
Iron
Taurine

Effectiveness Rating: Iron vs Taurine

The effectiveness rating is a measure of the supplements' ability to improve running performance. This rating answers the question of whether or not a supplement does what it claims. The evidence backing up iron to improve running performance is much better than the evidence backing up taurine. Iron should provide positive results while taurine will not.

Confidence Rating: Iron vs Taurine

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 taurine 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.