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When given by intramuscular injection, the dose bypasses the digestive tract and is absorbed reliably, which matters because dietary B12 absorption depends on stomach acid and a protein called intrinsic factor, both of which decline with age, medication and certain gut conditions
Vitamin B12, which is present in a soluble state when taken in liquid form, can be easily absorbed swiftly without the need for any further processing
La sequenza un frammento sinteticamente ottimizzato