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If you prefer convenience and cost-effectiveness, B12 injection kits may be suitable
Deficiency can occur in certain populations, including older adults, vegans, individuals with pernicious anaemia, those with malabsorption disorders such as Crohn's disease or coeliac disease, people who have had bariatric surgery or gastrectomy, and those on long-term medication such as metformin or acid-suppressing drugs
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According to the 2025 meta-analysis by Alfalasi and colleagues, sublingual B12 showed an approximate 199% mean increase in serum B12 compared to approximately 307% for intramuscular injections
But even if you and your veterinarian are able to get the underlying problem under control, the symptoms may not completely resolve because if left untreated, cobalamin deficiency causes vomiting, diarrhea, and weight loss
Side effects are not common with methylcobalamin injections, but its possible to have some pain and redness in the injection area
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