| 効果 | 増加 |
| 試験方法 | 二重盲検法 |
| 試験期間 | 1-6 ヶ月 |
| 被験者数 | 180 |
| 性別 | 男性 |
| 年齢 | 18-29, 30-44 |
| 体型 | 平均 |
この研究の注釈：
5 g of ashwagandha root daily for three months in infertile men was able to improve sperm motility and quality while also normalizing the reduction seen in testosterone concentrations.
Withania Somnifera Improves Semen Quality In Stress-Related Male Fertility
| 効果 | 増加 |
| 試験方法 | コホート法 |
| 試験期間 | 1-6 ヶ月 |
| 被験者数 | 60 |
| 性別 | 男性 |
| 年齢 | 18-29, 30-44 |
| 体型 | 平均 |
この研究の注釈：
Supplementation of 5 g of the root powder daily with skin milk for 3 months in infertile men with otherwise normal sperm morphology was able to increase sperm concentration and motility with more efficacy in men who were highly stressed (rather than heavy smokers or those who were neither) and was able to increase testosterone (10–22%) and reduce cortisol (11–32% AUC; 36-48% when measured at 4 p.m.) with similar favoring of stressed men.