Yes, glutathione can generally be taken daily when used within the recommended dosage
Dosage of glutathione GSH depends on the indication
Buccellato FR, DAnca M, Fenoglio C, Scarpini E, Galimberti D (2021) Role of oxidative damage in Alzheimers disease and neurodegeneration: from pathogenic mechanisms to biomarker discovery
Most Glutathione products you see are the one variant, and it is commonly just referred to as plain Glutathione
JP patent 54,107,594 Tezuka H, Otake Y, Yabuchi S, Kimura H (1987) A novel Saccharomyces promoter and its use in glutathione biosynthesis
Moreover, maintaining adequate levels of glutathione can bolster the immune system, helping the body ward off infections and improving recovery processes following illness