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Vitamin b12 levels are checked through a blood test
Abdulkhaleq, F
A Journal to Digest." Current Pharmaceutical Design, 2012;18(27):4027-4042
It is a great option (and alternative to oral supplements) for anyone who has any sort of gut issue in which absorption is impaired
For your first injection, use a different needle and syringe than the one used for reconstitution
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