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As with any injectable procedure, there are potential side effects
[1] Marginal deficiency is much more common and may occur in up to 40% of Western populations
If you are not deficient and are taking it as a supportive measure, you might not feel any dramatic change, and thats okay
Compared to cyanocobalamin, it is characterised by a stronger binding to tissue and serum proteins, which means a delayed excretion with the urine and thus a longer availability for absorption into the tissue stores
Others add B12 later, once the dose has stabilized
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