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Description
B12 injections have become increasingly popular because of this

Patients with Absorption Conditions Pernicious anemia, Crohn's disease, celiac disease, and gastric bypass surgery reduce B12 absorption from food and oral supplements
Over in seconds

Some people feel a lift within hours, while for others it builds over the first day or two

This is where the business of rheumatology gets learned
doi:10.1042/cs0660113
