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Purves-Tyson et al., 2017

Injection mixtures containing Pser-1::ser-1::SL2::GFP (30 ng/uL), Ptbh-1::ser-1::SL2::GFP (30 ng/uL), or Pglr-3::ser-1::SL2::GFP (30 ng/uL) together with the co-injection marker Pmyo-3::mCherry (3 ng/uL) were injected into DA1814 ser-1(ok345) X

Now that injectable GHK-Cu is legally available through licensed physicians and compounding pharmacies, the right question is not which one is legal but which one actually serves your goals

Figures 2, 4) availability is maintained by de novo synthesis from precursor amino acids, (glutamate, cysteine, and glycine), reduction of GSSG by glutathione reductase (GR), and uptake from exogenous GSH sources across plasma membranes (Figure 4) (62, 63)