Which supplement works better to increase testosterone: ashwagandha extract (withania somnifera) or tribulus terrestris?

Ratings at a Glance

Supplement	Effectiveness Rating	Confidence Rating
Ashwagandha Extract (Withania Somnifera)
Tribulus Terrestris

Effectiveness Rating: Ashwagandha Extract (Withania Somnifera) vs Tribulus Terrestris

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 backing up ashwagandha extract (withania somnifera) to increase testosterone is much better than the evidence backing up tribulus terrestris. Ashwagandha Extract (Withania Somnifera) should provide positive results while tribulus terrestris will not.

Confidence Rating: Ashwagandha Extract (Withania Somnifera) vs Tribulus Terrestris

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 ashwagandha extract (withania somnifera)'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.