So when I started doing this concierge model and getting interested in longevity, I started doing training courses in longevity medicine
Low levels commonly show up as brain fog, slow recall, and reduced concentration
To make a B12 plan thats just for you, think about your symptoms severity and how much B12 you need

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Vomiting as a presenting symptom of infantile vitamin B12 deficiency
Patients who have normal intestinal absorption may be treated with an oral therapeutic multivitamin preparation, containing 15 mcg vitamin B12 daily