Generic COAs posted as images on a website confirm nothing about the specific batch you are buying
Purification and Drying Glutathione in the supernatant is adsorbed onto a cation exchange resin, eluted via gradient elution to remove impurities, then concentrated and freeze-dried or spray-dried to obtain a white crystalline powder
Additionally, by doping the hydrogel sheet with magnetic nanoparticles, endothelial progenitor cells can be promoted to colonize the wound, enhancing the healing effect of hydrogels (Noh et al., 2019)
Qiu, Y.-B
Nanoscale 5 , 1262412632, (2013)
Additionally, glutathione supports the activity of other antioxidants, such as vitamins C and E, helping to regenerate them after they have been oxidised