where do i inject my b12 shot Best Vitamin Injection Sites How to self-inject intramuscular vitamin

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Subcutaneous shots hurt less, use tiny needles, and might actually give you steadier B12 levels over time

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Easy measuring: At 2,500 IU/mL, 1 unit = 25 IU on a U-100 syringe, so 500 IU = 20 units (0.20 mL)