Considering the concurrent use of Metformin and Vitamin B12 in this patient with diabetes and anemia, what is the most likely interaction affecting the patient's treatment regimen?
Metformin enhances the effect of Vitamin B12, improving the patient's anemia. Metformin and Vitamin B12 together increase the risk of lactic acidosis in this patient. Metformin may decrease the absorption of Vitamin B12, potentially exacerbating the patient's anemia. Vitamin B12 interferes with the action of Metformin, reducing its efficacy in controlling blood sugar levels.