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Description
A dose of 1000 mcg daily for 6 or 7 days should be administered by intramuscular or deep subcutaneous injection

For additional background, you can review this PubMed overview on GHK and tissue remodeling

Symptoms of serotonin syndrome range from agitation and confusion to rapid heart rate, high blood pressure, muscle rigidity, and seizures

They are also banned by most professional sports organizations and the NCAA