The term BPC-157 5mg refers only to a quantity label used for research vial identification
And then I would point out that there seems to be something else going on regardless of the amount of B12 in the patients blood

Based on the clinical evidence and the patient profiles where the compound appears most applicable, the following characteristics tend to describe good candidates for AOD 9604 evaluation when it is medically supervised: Patients with stubborn localized fat deposits that have not responded to diet and exercise, particularly visceral and lower abdominal fat Patients who cannot tolerate GLP-1 medications due to nausea, gastrointestinal side effects, or contraindications Active patients with reasonable baseline metabolic health who want a targeted lipolytic tool to complement their training and nutrition program Patients already on a peptide protocol who want to add a fat-targeting element to a GHK-Cu, NAD+, or sermorelin stack Patients who are not candidates for stimulant-based fat loss medications due to cardiovascular sensitivity, anxiety, or blood pressure concerns AOD 9604 is not appropriate as a standalone weight loss strategy for patients with significant obesity, insulin resistance, or metabolic syndrome

Standard semaglutide B12 dosage chart: the complete titration schedule The titration schedule for compounded semaglutide with B12 follows the same proven escalation pattern used in the STEP clinical trials
Regular Vitamin B12 Test can help you: Ensure Your Levels Are Rising: A steady improvement in your B12 levels indicates that the treatment is working