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Description
doi: 10.1002/cncr.33587

GHK-Cu supplied here is research-grade material for in vitro laboratory study, not a compounded preparation for human use

A bioactive collagen peptide trial reported 38% improvement in activity-related pain and 39% improvement in resting pain after 5g/day for 12 weeks
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The Pfizer paper, though, was different

Cell 158 , 481491 (2014)
