how to give vitamin b12 injection in arm Injections at Home - Safety Guide for Self-Administration Instructions for B12 Injection |

How many treatments will I need with Vaser

And a crucial point: avoid repeated freeze-thaw cycles with the liquid solution

Cyanocobalamin is indicated for vitamin B12 deficiencies due to malabsorption which may be associated with the following conditions: It may be possible to treat the underlying disease by surgical correction of anatomic lesions leading to small bowel bacterial overgrowth, expulsion of fish tapeworm, discontinuation of drugs leading to vitamin malabsorption (see Drug Interactions), use of a gluten-free diet in nontropical sprue, or administration of antibiotics in tropical sprue

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and described the applicable payment system for nonexcepted items and services (generally, the PFS)

The insomnia should settle, but as others have said you'd be better to avoid that form of B12 in the future