What the research shows
Pyo and colleagues cultured human hair follicles outside the body and separately studied cells from the base of the follicles. They reported greater hair-shaft elongation in culture and increased proliferation of those cells. The experiment did not measure changes in hair density on people’s scalps. Read the human hair-follicle culture study.
Documented formats
The experimental material was added to a culture medium. The study does not give a tested consumer scalp serum, shampoo or leave-on cream formulation.
Testing and purity
Check the peptide sequence and copper content separately. The initials AHK specify the order of the three amino acids. A result for total copper alone cannot identify the peptide bound to it.
How to read a batch reportQuestions about AHK-Cu
What is the difference between AHK-Cu and GHK-Cu?
AHK begins with alanine. GHK begins with glycine. A study naming one copper complex cannot establish an effect for the other.
Was the hair experiment a clinical trial?
The researchers worked with donated human tissue and cultured cells. Participants did not apply a finished product or have changes in scalp coverage assessed.