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Therefore, taking a 5000 mcg dose yields about 50 mcg of absorbed B12, which is vastly higher than the daily requirement of 2.4 mcg
For long-term benefits, many choose to continue regular treatments especially in the first few months

& Malone, T

doi: 10.1093/toxsci/kfae046

The physiological functions of iron regulatory proteins in iron homeostasis - an update
After 6 weeks, significant degradation may occur even under ideal storage conditions