The researchers investigated the effect of adding glutathione to sperm freezing medium on sperm quality in men with low sperm motility. They divided semen samples from 59 men into four parts, testing sperm before and after activation, and after cryopreservation with or without glutathione. Results showed that after adding glutathione, there was a notable improvement in sperm motility and viability during the freezing and thawing processes compared to using regular freezing medium alone. In simple terms, adding glutathione to the freezing medium can help preserve sperm quality better when freezing and thawing for men with low sperm motility.