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A person reports that they injected a mix of two peptides—ipamorelin and CJC—about a week after using an older vial (roughly two months old) and then developed a strong allergic-like reaction. They say they got hives (raised itchy welts) at the spots where they had previously injected, and when they tried a newly-mixed fresh vial they still got the same kind of reaction, though somewhat milder. The problem shows up even when they use new injection sites. Ipamorelin and CJC are peptides, which just means they’re short chains of amino acids — small versions of the proteins your body makes. People sometimes use these particular peptides to try to influence growth hormone patterns; ipamorelin is a growth-hormone-releasing peptide and CJC is a related peptide that can boost that effect. They are typically dissolved (reconstituted) from a powder into liquid before injection. That’s all to say: these are not pills or standard prescription drugs, and they’re usually handled and mixed by users themselves. What the posted report actually shows is a single-person account of a likely hypersensitivity (histamine) reaction after injecting a peptide mix from an older vial, and a persistent similar reaction even after switching to a fresh vial. This is anecdotal — one person’s experience, not a controlled study. It suggests either an allergic reaction to one of the peptides, to something added during reconstitution (a preservative or the solvent), to contamination of the older vial, or a developing immune response where the body now reacts at old injection sites. The original post doesn’t give lab tests, doctor evaluation, or a clear timeline of other medications, so we can’t be certain what caused it or how common this is. Why this matters: anyone injecting substances under the skin needs to take reactions seriously. Reactions like hives can progress to more dangerous allergic responses, and repeated reactions at old injection sites could indicate your immune system has started targeting whatever was injected. People using peptides, whether for performance, aesthetics, or experimentation, should know that self-mixing and self-injection carry infection and allergy risks, and that products obtained outside medical channels can be contaminated or improperly stored. Caveats and risks: this is not medical advice and we don’t know the person’s full medical history. Peptides can cause allergic reactions in some people. Improper reconstitution, contaminated vials, or incorrect storage can increase risks. If someone has widespread hives, breathing trouble, swelling of the face or throat, or dizziness, they need immediate emergency care. For persistent reactions, stop injections and see a healthcare professional who can evaluate, possibly test for allergies, and treat symptoms. Also note that many peptide products are not regulated like prescription drugs, so their purity and storage instructions aren’t guaranteed. Bottom line: a single user reports likely allergic reactions after injecting ipamorelin/CJC, so stop use and get medical evaluation rather than continuing to inject.
Source: r/Peptides