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A 150 mcg dose = 0.045 mL = about 45 units on a U-100 syringe
Every lot is independently tested for identity, purity, and content, with a lot-specific Certificate of Analysis available for review
The most common method, also introduced by Schilling, is to inject a high dose of unlabeled B12 to saturate all binding capacities of the B12 binding proteins, and thereby facilitating urinary excretion of the absorbed radioactively labeled B12
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