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Description
Injecting directly into muscle is usually more painful than injecting into the subcutaneous layer of fat below the skin

reusing one reintroduces bacteria and dulls the tip

This prevents condensation from forming inside the vial when you uncap it, which can introduce moisture and compromise the peptide

doi: 10.3389/fmolb.2023.1224982 71 PattersonE.RyanP
