Shilajit
The most widely cited clinical study on Shilajit for male fertility is:
"Clinical Evaluation of Spermatogenic Activity of Processed Shilajit in Oligospermia"
Published in Andrologia (2010), this human clinical trial involved 35 men diagnosed with oligospermia (low sperm count). Participants were given processed Shilajit (100mg twice daily) for 90 days.
Key findings:
Sperm count increased by 61.4%
Sperm motility improved by up to 17.4%
Serum testosterone levels increased by 23.5%
No significant side effects reported, affirming the supplement’s safety at the studied dose
This study is considered foundational and is frequently referenced in scientific reviews and supplement marketing when describing Shilajit’s effect on male reproductive health.
Ashwagandha
For Ashwagandha, the most notable published human study is:
"Clinical Evaluation of the Spermatogenic Activity of the Root Extract of Ashwagandha (Withania somnifera) in Oligospermic Males: A Pilot Study"
Published in Evidence-Based Complementary and Alternative Medicine (2013), this randomized, placebo-controlled study enrolled 46 oligospermic men. The treatment group received 675mg of Ashwagandha root extract daily for 90 days.
Key findings:
Sperm count increased by 167%
Semen volume increased by 53%
Sperm motility improved by 57%
Serum testosterone and luteinizing hormone (LH) levels rose significantly compared to placebo
Minimal improvements were seen in the placebo group
This study is highly influential and is frequently cited in scientific literature as strong evidence supporting Ashwagandha’s fertility benefits in men.
These studies serve as the primary clinical evidence for the use of Shilajit and Ashwagandha in support of male fertility.
Source for one of the studies for Shilajit: https://pubmed.ncbi.nlm.nih.gov/20078516/
Source for one of the studies for Ashwagandha: https://www.unboundmedicine.com/medline/citation/24371462/Clinical_Evaluation_of_the_Spermatogenic_Activity_of_the_Root_Extract_of_Ashwagandha__Withania_somnifera__in_Oligospermic_Males:_A_Pilot_Study_