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When vitamin B12 and intrinsic factor bind, it is called the vitamin B12-intrinsic factor (B12-IF) complex (Intrinsic Factor and Vitamin B12 Absorption)
A handful of people notice a difference almost right away, while for others it takes a bit longer to kick in
The standard 4-6 weeks on, 2-4 weeks off pattern provides a structured approach even without specific data guiding these intervals
This means that it is not possible to overdose on vitamin B12, and as far as we know there is no upper limit on the amount of B12 that can be taken safely by an otherwise healthy person
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