side effects of b12 injections in dogs Vaccine Reactions Dogs: Everything You Should Know Vitamin B12 Injection – Manufacturer

People with pernicious anemia, may benefit from sublingual B12 as they lack intrinsic factor and have a lot of trouble absorbing B12 through their digestive system (Ankar, 2020)

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[1] [4] Do not rely solely on sublingual supplements if you have neurological symptomsthese require urgent medical evaluation and may necessitate intramuscular B12 therapy to prevent irreversible nerve damage

Side effects are rare but may include redness or swelling at the injection site, and occasional nausea

This is a significant advantage over full-length growth hormone, which worsens insulin resistance