In a 2024 review of three peptides, the FDA noted side effects like increased heart rate, chest tightening, headache, nausea, diarrhea, and elevated liver enzymes, as well as skin irritation and pain at the injection site
NAD+ GHK-Cu is a small copper-containing peptide that naturally exists in your blood, saliva, and urine
6 weeks: 3 vials use 6 mL total
Canadian researchers have studied it in models of tendon repair, gastrointestinal healing, muscle recovery, and neuroprotection
It is particularly beneficial in animals suffering from stress, chronic illness or poor appetite
The peptide appears to promote tenocyte proliferation and enhance extracellular matrix synthesis, leading to improved biomechanical properties of repaired tissues