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GHK-Cu is highly sensitive to carboxypeptidase cleavage, light-driven copper photo-oxidation and pH extremes, with an optimal range of about 5.0 to 6.5
Psychiatry Anxiety, panic, depression, obsessive compulsive disorder (OCD), decreased attention span, attention deficit/hyperactivity disorder (ADHD), forgetfulness, and insomnia
No study has compared injecting near an injury against injecting elsewhere for these compounds "inject near the injury" is a reasonable, low-cost default, but it is practitioner convention, not an evidence-backed advantage
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TrainiEIanniFVerganiECarnassaleGDaloisoGManciniAet al
What GHK-Cu does not do, based on the mechanistic literature, is directly block the 5-alpha reductase enzyme the way finasteride does
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