ghk-cu copper overload risk A Dermatologist's Take on the Peptide (GHK-Cu) Trend Copper Peptides for Hair Loss:

Cycling Alternating periods of peptide use with rest periods to prevent receptor desensitization and allow physiological recovery

99 Daily doses of at least 50100 g are needed in cases of maternal deficiency, and should improve inadequate levels in the infant without exposing the infant to excessive B12

doi: 10.1016/S1474-4422(04)00933-0 13 AscherioAMungerKLWhiteRKochertKSimonKCPolmanCHet al

This could be due to the authors or co-authors retracing the study, journal editors issuing a retraction after complaints from readers, editors-in-chief issuing retractions because of extensive issues reported in the studies, or journal boards issuing retractions because of several studies coming into question, thus affecting the reputation of the journal itself