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The combination may amplify gastrointestinal discomfort in susceptible individuals, though this represents an additive effect rather than a true pharmacological interaction

Muscle Regeneration and Recovery Both peptides demonstrate significant effects on muscle tissue repair and regeneration following injury

This includes cleaning the injection site with alcohol, using a sterile syringe and needle, and injecting into the muscle at a 90-degree angle

For skin, hair, and healing, the answer looks promising enough that GHK-Cu has stayed relevant for decades instead of disappearing like most peptide trends do

Circulation, 109(19), e309-e310

However, pretreatment with GHK-Cu at 1, 5, and 10 M significantly decreased ROS production