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Ask about training and beware of "peptide mills" Don't succumb to hype

10.1378/chest.117.3.914 38

Every batch of PSPeptides GHK-Cu is independently tested at 99% purity via HPLC and mass spectrometry by a third-party laboratory

The proposed mechanisms of these peptides map onto that physiology, but their clinical effects should still be discussed with appropriate hedging

found that estrogen causes an increase in GCL activity in human breast cells in vitro [5]

In practice a GP or nurse may administer off-licence by giving a sub-cutaneous (under the skin, SC) injection but it is important to remember that the GP makes their own decision and takes their own accountability and reliability if they go off-licence