Because glutathione works on the production of new pigment, you generally need to wait for a full skin cell turnover cycle to see visible changes
Besterman HS, Bloom SR, Sarson DL, Blackburn AM, Johnston DI, Patel HR, et al
Raw Material Testing (Incoming Inspection) Starting materials and key excipients are tested for appearance, identification (HPLC/MS), purity (HPLC 98%), and moisture content
The results from this study may reveal an important basis underlying the gender-associated differences in the longevity and the susceptibility to certain age-related diseases, and also further suggest that the decreased synthesis, which is mainly due to the down regulation of GCL gene expression, may be responsible for the age-associated decline in GSH content
One is multi-use safety, whereas the other is pure single-use
Single-dose devices can also raise questions if someone sees fluid on the skin or in part of the device after use