The false-low b12 phenomenon complicates assessment further
Modulatory Effects of BPC 157 on Vasomotor Tone and the Activation of Src-Caveolin-1-Endothelial Nitric Oxide Synthase Pathway, Hsieh MJ, Lee CH, Chueh HY, Chang GJ, Huang HY, Lin Y, Pang JS, Scientific Reports, 2020 Oct 13;10(1):17078.
Data from the 2021 Nature Aging paper are particularly illuminating on this point

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Don't panic you have not ruined the peptide itself
Patients using compounded tirzepatide with B12 should monitor closely for signs of infection at injection sites, including increasing redness, warmth, swelling, pain, or purulent drainage, which may indicate contaminated product