The effect of tripeptide-copper complex on human hair growth in vitro
Pyo HK, Yoo HG, Won CH, et al. Archives of Pharmacal Research 2007;30:834-839.
What it found
AHK-Cu made human hair follicles grow longer outside the body and increased the growth of dermal papilla cells. At 10^-9 M it raised the Bcl-2/Bax ratio and lowered cleaved caspase-3 and PARP; the fall in apoptotic cells was not statistically significant.
Limitations
Lab study on isolated follicles and cultured cells only; no animals or people. The only published study of AHK-Cu itself that we could find, and not independently repeated.
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