There is no single right answer that applies to everyone at every phase
This is similar to GLP-1s and other sub-Q medications
Purification and characterization of corn glutathione S-transferase [PMID: 6838840] Laboratory literature summary: Purification and characterization of corn glutathione S-transferase
Zhao Y, Zhang L, Qiao Y, Zhou X, Wu G, Wang L, et al
Research shows that while glutathione has been marketed extensively for skin lightening, vitamin C offers more scientifically proven benefits for overall skin brightening and health
These injections primarily aid in detoxifying the body, eliminating harmful free radicals and reducing oxidative stress