how much b12 can you have in an im injection Sandoz Vitamin Injectable Solution - 1000 mcg/10 mL B12 Shots at Home: How,
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An evaluation of cimetidine and ranitidine in the pain relief and acute healing of duodenal ulcer disease

The answer is

This means healthcare providers can help patients with vitamin B12 deficiency get better by using proven methods (PMC11128391)

Instead, they are made in pharmacies when there is a medical reason, sometimes to help with possible B12 deficiencies that might happen during use
