Ashvagandha augments immunity by improving immune factors and the level of white blood cell activation, especially Natural Killer (NK) cells, which play a major role in neutralizing virus-infected cells and help restrain infections. Himalaya Speman tablets enhance spermatogenesis by improving testosterone levels in men affected by oligospermia (semen with a low concentration of sperm). It further improves the sperm count and the quality of semen. It also enhances sexual performance by improving sexual desire and sustaining penile erection.