In 2024, Sakuma et al., in Japan, carried out a clinical study to evaluate the effects of cysteine peptides, which included both reduced glutathione (GSH) and oxidized glutathione (GSSG), over 5 weeks
Hesitation or inability to provide testing documentation represents a significant red flag
Extra caution should also be exercised in pregnant or breastfeeding women , children under three years of age , and individuals with liver or kidney impairment
This is the more commonly recommended option, and for good reason
The rationale for cycling includes allowing receptor resensitization and providing observation periods to assess maintained benefits
Compare current photos to pre-treatment images