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Unlike oral supplements, an injection delivers vitamin B12 directly into the body without relying on digestive absorption which can be reduced by age, certain medications such as proton pump inhibitors or metformin, or gastrointestinal conditions
and inferior to systemic glucocorticoids with an improved safety profile for both indications[1,24,3537]
Option 1: Add 2mL of bacteriostatic water (recommended for most researchers) This creates a 5mg/mL concentration
Vitamin B 12 deficiency resulting from inadequate dietary intake is the easiest to treat
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