The 23G x 1.25 you have should be fine to use
Buy DSIP from reputable suppliers like Direct Peptides, known for providing 99% pure formulations
GSH depletion decreases hepatic neutral lipid accumulation under HFD
2001;30(5):426427 Michele Abate, Vincenzo Salini, CosimaSchiavone& Isabel Andia (2017) Clinical benefits and drawbacks of local corticosteroids injections in tendinopathies, Expert Opinion on Drug Safety, 16:3, 341-349, DOI: 10.1080/14740338.2017.1276561 Kong A, Van der Vliet A, Zadow S
Chemical Peels accelerate cell turnover while peptides strengthen and rebuild the barrier
It needs to be consumed in the form of cystine, so it survives digestion, and gets into the cells intact, where it can be stored until needed to make glutathione when it is needed by the cells