Sperm Quality

Sperm quality refers to the structural capacity of sperm cells and their ability to fertilize (and does not necessarily reflect sperm count nor motility). Supplements that improve sperm quality are thought to be pro-fertility agents.


Research analysis by and verified by the Examine.com Research Team. Last updated on Apr 29, 2017.

Human Effect Matrix

The Human Effect Matrix looks at human studies (it excludes animal and in vitro studies) to tell you what supplements affect sperm quality

Grade Level of Evidence
Robust research conducted with repeated double-blind clinical trials
Multiple studies where at least two are double-blind and placebo controlled
Single double-blind study or multiple cohort studies
Uncontrolled or observational studies only
Level of Evidence
? The amount of high quality evidence. The more evidence, the more we can trust the results.
Outcome Magnitude of effect
? The direction and size of the supplement's impact on each outcome. Some supplements can have an increasing effect, others have a decreasing effect, and others have no effect.
Consistency of research results
? Scientific research does not always agree. HIGH or VERY HIGH means that most of the scientific research agrees.
Notes
L-Carnitine
All comparative evidence is now gathered in our ​Supplement Goals Reference.
The evidence for each separate supplement is still freely available ​here.
Mucuna pruriens  
Ashwagandha  
Coenzyme Q10  
Eurycoma Longifolia Jack  
Shilajit  
Astaxanthin  
Saffron  
Tribulus terrestris  
Vitamin C  
D-Aspartic Acid  
Ginger