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Numbness and/or tingling

And the answer, frustratingly, is "it depends." Different peptides have different shelf lives in solution

[DOI] [PMC free article] [PubMed] [Google Scholar] 79.Casciola-Rosen L., Thiemann D.R., Andrade F., Trejo-Zambrano M.I., Leonard E.K., Spangler J.B., Skinner N.E., Bailey J., Yegnasubramanian S., Wang R., et al

This can lead to palpitations, irregular heart rhythms, or even chest pain