is b12 injection subcutaneous or intramuscular im vitamin Store vs Injections for vitamin B12 supplements Vitamin B12 Injection How to self-inject intramuscular vitamin

Pernicious anemia is often found in conjunction with other autoimmune disorders, suggesting common autoimmune susceptibility genes may be a causative factor

Drinking a lot of alcohol or taking certain medicines can also affect B12 absorption

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This makes it less likely to cause systemic side effects like water retention, insulin resistance, or abnormal growth of tissues

Keep in mind that oral B is not well absorbed in people who truly lack intrinsic factor or have certain GI issues, which is why B is usually injected or given as a high-dose sublingual in those cases