Its a supportive therapy, not a replacement for proper medical care
Glutathione and its precursors (such as cysteine peptides) are absorbed intestinally and distributed systemically [66], reaching dermal tissues to exert photoprotective and skin-lightening effects, particularly relevant for women concerned with age-related pigmentation changes [74, 75]
I feel a big difference for the better
Seiwerth, S., Milavi, M., Vukojevi, J., Gojkovic, S., Krezic, I., Vuleti, L., Pavlov, K., Petrovic, A., Sikiri, S., Vrane, H., Prtori, A., Zizek, H., Durasin, T., Dobri, I., Stareini, M., trbe, S., Kneevi, M., ola, M., Kokot, A., Sever, M., Lovri, E., krti, A., Blagaic, A., & Sikiric, P
Work on a clean surface, wash your hands thoroughly, and avoid touching the inside of bottles or mixing vessels