Peptide Therapy: Benefits, And Side Effects ExplainedAre There Any Known Side Effects of Peptide Therapy? Peptide therapy, like any medical intervention, can produce side effects that vary in frequency and severity. Common mild reactions include localized redness or swelling at the injection site, temporary headaches, fatigue, or a low-grade fever. More rarely, patients may experience dizziness, nausea, or muscle aches as their body adjusts to new biochemical signals. In some |