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The quantitative data may shed deeper light on aspects such as the availability of glutamine as a precursor for neurotransmitters, its role as a metabolic substrate, and nitrogen carrier or its involvement in the activation/proliferation of glial cells dependent on glutamine

We mention this not to claim GHK-Cu is "better" than retinol - it isn't a fair comparison given the difference in research depth - but because it suggests the ingredient is doing something real at the structural level when formulated and applied thoughtfully

The most worrisome possibility is that of impaired blood clotting, which increases the likelihood of hemorrhage in some individuals

doi: 10.3390/cells9122650, 98 PalA.CerchiaroG.RaniI.VentrigliaM.RongiolettiM.LongobardiA.et al

Follistatin 344 (95%) is a research peptide corresponding to a 344amino acid human follistatin isoform that binds and neutralizes activins and related TGF family ligands