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The standard starting dose is 20 units on an insulin syringe (0.2 mL)
Intrinsic Factor and Absorption Challenges As previously noted, intrinsic factor is a key player in B12 absorption, as it binds to the vitamin, allowing for proper absorption
In short, the difference between oral supplementation and injection is that an injection will provide a higher dose of B12 at regular intervals, whilst oral supplements have a lower dosage and can be taken every day
Evidence for intestinal origin of transcobalamin II during vitamin B12 absorption
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