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[DOI] [PMC free article] [PubMed] [Google Scholar] 24.Ertmann RK, Mller JJ, Waldorff FB, Siersma V, Reventlow S, Sderstrm M

Injection technique and site rotation Subcutaneous injection places the peptide just beneath the skin, into the fatty tissue layer

And you can feel the effects much, much faster
Gentle swirling is acceptable, but shaking can denature the peptide and reduce potency
