The clearest guidance comes from injection science more broadly
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Arch Toxicol 99(5):18931997 Steiner AZ, Hansen KR, Barnhart KT, Cedars MI, Legro RS, Diamond MP et al (2020) The effect of antioxidants on male factor infertility: the Males, Antioxidants, and Infertility (MOXI) randomized clinical trial
In your body, antioxidants work as a team, helping each other stay active: Vitamin C plays a special supporting role to glutathione
On the other hand, also in the extracellular space, the cysteinyl-glycine fraction is split by the enzyme dipeptidase generating cysteine and glycine