No safety data You can't determine risk vs
Potential Side Effects Although Vitamin B12 injections are usually harmless, some patients might experience minor side negative effects

Indications and Usage Ozempic (semaglutide) injection 0.5 mg, 1 mg, or 2 mg and Ozempic (semaglutide) tablets 4 mg or 9 mg are indicated: as an adjunct to diet and exercise to improve glycemic control in adults with type 2 diabetes Ozempic injection is indicated: to reduce the risk of major adverse cardiovascular (CV) events (CV death, nonfatal myocardial infarction, or nonfatal stroke) in adults with type 2 diabetes and established CV disease to reduce the risk of sustained eGFR decline, end-stage kidney disease, and cardiovascular death in adults with type 2 diabetes and chronic kidney disease Ozempic tablets are indicated: to reduce the risk of major adverse cardiovascular (CV) events (CV death, nonfatal myocardial infarction, or nonfatal stroke) in adults with type 2 diabetes who are at high risk for these events Important Safety Information for Ozempic WARNING: RISK OF THYROID C-CELL TUMORS In rodents, semaglutide causes dose-dependent and treatment-duration- dependent thyroid C-cell tumors at clinically relevant exposures

E., Schomaker, S
Without treatment, vitamin B12 deficiency can cause physical, neurological and psychological problems
In addition, radiation decreases the expression of MUC2, which is the major component of the mucus layer, thereby weakening the protective effect of the mucus layer and increasing the vulnerability of the intestinal epithelium to bacterial invasion 63