b12 injection subcutaneous vs.intramuscular vs intramuscular What form of vitamin B12 (cobalamin) is more effective for intramuscular or subcutaneous injections in patients with vitamin B12 deficiency? 4 Best B12 Injection Sites:

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B12 has a wide safety margin, and side effects are usually minor, such as brief soreness at the injection site

Any excessive amount not used by the body is flushed out in the urine due to vitamin B12 being a water soluble vitamin

Repeat in 2 to 4 days if required or as recommended by a veterinarian

After receiving a B12 injection, there may be some pain or redness at the injection site, and there is the possibility of mild diarrhea, itchiness and the feeling of swollen skin all over your body