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If your B12 is already normal, an injection is unlikely to change how you feel
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B12 for Energy, Mood, and Focus If your main concern is fatigue, B12 can provide an effective reset
Here is how they relate: 1mg = 1,000mcg (milligrams to micrograms) 1mL = 100 units (on a U-100 insulin syringe) Units to draw = (Dose in mg / Concentration in mg per mL) x 100 Or equivalently: Units to draw = Dose in mcg / (Concentration in mcg per mL / 100) Some researchers find it easier to work entirely in micrograms because it eliminates decimals
