side effects to b12 injections Why Do I Feel Worse After My Injection? Causes & Management – Bolt Pharmacy What Happens When You're Allergic

According to NIH, vitamin B12 is naturally present in animal foods like fish, meat, poultry, eggs, and dairy products, but you can also find it in some fortified breakfast cereals and fortified nutritional yeasts

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Tablets also simplify storage management

Headache: Reported in 2-5% of patients, possibly due to rapid B12 elevation affecting cerebral blood flow

Other factors include: Underlying cause of deficiency : Pernicious anaemia, malabsorption disorders, or dietary insufficiency may affect treatment response Medication use : Metformin and proton pump inhibitors can reduce gastrointestinal B12 absorption (though this does not affect the efficacy of intramuscular injections) Individual variation : Differences in how efficiently your body utilises the injected vitamin Adherence to treatment schedule : Missing injections or delaying maintenance doses can slow recovery Discussing these factors with your healthcare provider helps set realistic expectations for your treatment journey