ben lynch glutathione covid COVID‐19 vaccine adverse events: Evaluating the pathophysiology with an emphasis on sulfur metabolism and endotheliopathy - du Preez - 2024 - European Journal of Clinical Investigation Endogenous Deficiency of Glutathione as
Description
It is commonly used for: Skin lightening or brightening purposes

But GHK-Cu is just the tip of the peptide iceberg
Consequently, the likelihood of analogous effects occurring in humans to those observed in cells or animals is low

PMID: 39201787

Thats the whole reason peptides are cheap to make, and antibodies and other biologics need the living-cell factories
Injectable peptides for hair growth provide systemic benefits and higher bioavailability