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Ex vivo studies using dissected hair follicle organ cultures allow researchers to observe the effects of GHK-Cu on the hair cycle itself, particularly its potential to prolong the anagen (growth) phase

So the agency can't even write a quality standard for it because it can't say what "it" is

Possible Side Effects and Scalp Reactions to Be Aware Of Copper peptides are generally well tolerated, but scalp redness, itching, dryness, and contact dermatitis can occur

Starting with a lower dose and gradually increasing it under the guidance of a healthcare professional is advisable

All materials and solvents used in the study were of analytical grade and were utilized without further purification