Older adults, who often suffer from decreased hydrochloric acid in the stomach, and individuals with gastrointestinal (GI) disorders may have lower absorption of B12.2,4 Vitamin B12 deficiency may be characterized by megaloblastic anemia, fatigue, weakness, constipation, loss of appetite, soreness of the mouth or tongue, and weight loss
Taking these medications long-term is associated with an increased risk of serious side effects such as heart attack, stroke, heart failure, gastrointestinal bleeding, ulceration, and perforation, kidney injury, potential liver strain, and serotonin syndrome
The right choice depends on your dosing protocol and the type of syringe you are using
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