Safety & Legality
Peptide Side Effects: What to Expect and When to Stop
9 min read0 peptides covered
Comprehensive guide to peptide side effects — common reactions, serious warnings, and when to seek help.
What are common peptide side effects?
Side effects vary by peptide type. GLP-1s: nausea (60-70%), constipation (40%). Healing peptides: injection site reactions (5-10%), fatigue (5%). GH peptides: water retention, hunger (MK-677), tingling. Most side effects are mild and transient. Severe reactions are rare (<1%).