Peptides are generally considered safe when sourced from reputable, regulated providers and used under medical supervision. Safety depends on factors like the type of peptide, dosage, administration method, and individual health conditions. Common side effects may include injection site reactions, headaches, nausea, and fatigue. Potential risks also involve allergic reactions, hormonal imbalances, and interactions with other medications. Long- term safety is still uncertain due to limited research, so peptide therapy should be closely supervised by a knowledgeable healthcare professional who monitors for adverse effects and therapy effectiveness. Using peptides from unregulated sources or without supervision increases the risk of contamination and incorrect dosing. Overall, peptides can be safe but require careful medical oversight.