glutathione powder for face in netherlands What the Glass Skin Glutathione

This suggests that excessive GHK-Cu (or other copper peptides) might theoretically push skin MMP-1 concentrations beyond levels supporting healthy collagen production into ranges associated with collagen fragmentation and breakdown seen in older skin with naturally elevated MMP-1

Shen H, Peng JL, Tayarachakul S, Liangpunsakul S

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Molecular mechanisms behind free radical scavengers function against oxidative stress

Oral glutathione has low bioavailability much of it is broken down in the digestive tract before it can reach cells

Its akin to saying something like let vendors that produce high-quality but unapproved and scientifically unproven pharmaceuticals sell them without formal FDA approval because otherwise people will use risky counterfeits. It makes no sense