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3.2 Quality assessment and risk of bias According to the Jadad scale for RCTs (n = 13) (Tanaka et al., 1981
Several studies have indicated that the efficacy of oral vitamin B12 supplements is comparable to that of vitamin B12 injections
With a 5 mg vial mixed with 3 mL of bacteriostatic water, 500 mcg equals about 30 units on a U-100 syringe
Keep in mind that all of these studies suggest only supplementing vitamin B12 in the case of a documented deficiency
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