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GHK-Cu has an extensive safety record in topical applications and is well-tolerated in injectable protocols at appropriate doses

Gastrointestinal effects lead: nausea, diarrhea, constipation, and vomiting, dose-dependent and clustered during escalation, mostly mild. Tirzepatide also produces a modest chronic heart-rate rise with a larger escalation-phase peak. Oral-contraceptive absorption can fall after starting and after each increase, so use backup or non-oral contraception for 4 weeks each time. What is known about concurrent metformin and tirzepatide use

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Needles have a high risk of infection, so they should be done in a professional setting