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side effects of b12 injections uk What Is Injection What's all the Buzz About Vitamin B12 Shots? Signs You May Be Deficient
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The suggested frequency may rise to two-three times per week for weight loss and fat metabolism

So I wouldnt over think it ,just find your way through

18 Prevention Because of potential interactions from prolonged medication use, physicians should consider screening patients for vitamin B 12 deficiency if they have been taking proton pump inhibitors or H 2 blockers for more than 12 months, or metformin for more than four months

Given that B12 is a water-soluble vitamin, the majority of an injected dose is excreted through urine, leaving only a small fraction for absorption
