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Groups at higher risk of deficiency include older adults (due to reduced stomach acid production), people following vegan or strict vegetarian diets (as B12 is naturally found almost exclusively in animal products), individuals with pernicious anaemia or other malabsorption conditions, those taking certain medications such as metformin or proton pump inhibitors long-term, and people with significant nitrous oxide exposure (including recreational use), which can inactivate B12 in the body
If your blood levels are lower than 200pg/mL or if you are diagnosed with pernicious anemia, your doctor may recommend B12 supplementation via injection
Choosing the injection site
Taking B12 by mouth helps with small deficiencies and daily upkeep
