oral b12 or injection Vitamin vs Injection​ Vitamin B12 Injection - 10mL

Symptoms of vitamin B12 deficiency: extreme tiredness a lack of energy pins and needles a sore and red tongue mouth ulcers muscle weakness problems with your vision psychological problems, which can range from mild depression or anxiety to confusion and dementia problems with memory, understanding and judgement Causes of a vitamin B12 deficiency: pernicious anaemia a lack of these vitamins in your diet medicine certain medicines, including anticonvulsants and proton pump inhibitors (PPIs), can affect how much of these vitamins your body absorbs

As you see, at any age, pernicious anemia is related to impaired absorption of B12 because of IF issues

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Juraschek SP, Miller ER, 3 rd , Gelber AC