It depends on the peptide , the dose and your state of health, but generally speaking: you may alter your hormonal balance (GH, IGF-1, cortisol, insulin) you may artificially influence growth and repair processes you may experience local side effects (reactions at the injection site) and systemic side effects (nausea, headaches, fatigue, digestive problems) by using unauthorised products , you may be at risk of contamination, incorrect dosages and substances other than those stated
Some side effects may be easy to manage, too
Rheumatol Int 35:15551559
We explain how each works, what the research supports, how they compare, and what anyone considering peptide therapy needs to understand before moving forward