Which supplement works better to increase testosterone: tribulus terrestris or zinc?

Ratings at a Glance

Supplement	Effectiveness Rating	Confidence Rating
Tribulus Terrestris
Zinc

Effectiveness Rating: Tribulus Terrestris vs Zinc

The effectiveness rating is a measure of the supplements' ability to increase testosterone. This rating answers the question of whether or not a supplement does what it claims. The evidence shows zinc is better than tribulus terrestris in its ability to increase testosterone. Zinc should provide some positive results while tribulus terrestris will not.

Confidence Rating: Tribulus Terrestris vs Zinc

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.

Tribulus Terrestris's confidence rating is higher than zinc's. This means tribulus terrestris's effectiveness rating from above is more valid. This does not necessarily mean that tribulus terrestris works better, it simply means the evidence (included in this database) backing up tribulus terrestris is more established.