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A patient with Pernicious Anemia cannot do this

When you take a massive dose of Vitamin B12 (such as a 1000 mcg pill), that 1% absorption rate allows about 10 mcg to enter your bloodstream [6] [8]

Anemia develops from B12 deficiency, as the vitamin is engaged in the production of healthy red blood cells

A provider will typically: Ask about your symptoms and medical history Request a recent blood test to check B12 levels Evaluate whether injections are appropriate If B12 shots are recommended, the provider can issue a prescription, which you can fill at a local pharmacy or through a telehealth pharmacy that ships to you

B12 shots are given based on your individual needs

Additionally, patients using both treatments may attribute weight loss or adverse effects to the wrong agent, complicating clinical assessment