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Both units are used, but mcg is more common for B12 doses, mainly for smaller amounts
This is why it is labeled as a single-use option
A 1 ml syringe may be more comfortable for frequent, smaller doses, while a 3 ml syringe may be better for less frequent, larger doses
Recalls & Warnings March 30, 2011 More Protein Supplements Recalled for Salmonella Risk On March 29, the U.S
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