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AOD-9604 is a synthetic 16-amino-acid peptide corresponding to a fragment of the C-terminus of human growth hormone (hGH), with a tyrosine residue added at the N-terminus

It is not a medical service and is not appropriate for people with a diagnosed B12 deficiency, who should be under the care of their GP

Some users add significantly more water to make the vial last longer, essentially diluting below effective concentrations

If tirzepatide expiration and waste concern you, match your vial size to your weekly dose so each vial gets fully used within the stability window

Last reviewed: May 12, 2026 Last updated: May 12, 2026 Written by: Jay Hastings , CEO of PlexusDx Jay Hastings is the CEO of PlexusDx, a precision health company focused on genetic testing, blood biomarker insights, and personalized wellness recommendations

Less common: Nausea, dizziness, or headache