administration vitamin b12 injections C and Injection Techniques Best Vitamin B12 Injection Sites
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So, we recommend using SL vitamin B12 rather than oral and IM, especially in patients who do not tolerate IM injection and patients who need prolonged vitamin B12 supplementation, such as patients with long-term metformin use and patients with pernicious anemia or with gastro-duodenal resection [5154]

How to take it B12 injections should be administered deep into a gluteal muscle by a healthcare professional

For the broader picture, our NAD and peptides explainer covers why the two get confused
