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Most researchers using 5 mg/mL vials stay at lower doses like 2.5 mg (50 units) or 5 mg (100 units), making this concentration best suited for early-stage dosing or microdosing protocols
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Without testing, there is no way to distinguish between B12 deficiency and other causes of similar symptoms, no way to determine the severity of deficiency, and no way to select the most appropriate delivery method
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