Ashwagandha (Withania somnifera) is a medicinal herb that has been used for thousands of years in traditional medicine. The root is the part most commonly used as that is where the majority of the pharmacological ashwagandha benefits are found. 
Ashwagandha is said to have health benefits like more energy, less stress , increased physical strength, improved metabolism, and better sex drive. Some research also suggests ashwagandha may help boost male fertility and sperm health.One study found that ashwagandha may increase sperm count and motility (movement), and increase levels of reproductive hormones. Since ashwagandha acts as an antioxidant, it may protect sperm cells from damage caused by oxidative stress.