If a vial has been opened or the seal is compromised, the powder may absorb ambient moisture, effectively changing the amount of "dry" peptide before you even add water
Cohen SA, Kasi PM, Aushev VN, Hanna DL, Botta GP, Sharif S, Georgios I Laliotis MD, PhD, Sharma VR, Alqahtani A, Chandana SR, Kang S, Chakrabarti S, Somer BG, Kasi A, Dayyani F, Malla M, Jurdi AA, Liu MC, Aleshin A, Kopetz S
Glutathione supplements are notorious for poor bioavailability, meaning your stomach acids often break them down before they can reach your cells
While it may be a useful addition to some skincare routines, individual results vary, and persistent skin concerns should be discussed with a qualified healthcare professional