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With a 10mg/mL concentration (1mL of water added), that 4mg dose requires drawing 0.4mL, which equals 40 units on a standard U-100 insulin syringe
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This is especially true for those that are vegan or have had gastric bypass surgery, since they do not absorb enough B12 to keep your stores well-stocked
The most common medications associated with B12 deficiency include: Proton Pump Inhibitors (PPIs): Examples include omeprazole, esomeprazole, and lansoprazole
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