| Peptide Therapy: Benefits, And Side Effects Explained Are There Any Known Side Effects of Peptide Therapy? While peptide therapy is often celebrated for its targeted biological effects, it can still provoke side reactions in some individuals. Common mild responses include localized redness, swelling, or tenderness at the injection site when peptides are administered intramuscularly or subcutaneously. Systemic manifestations are less frequent but may involve transient fatigue, headach
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