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10.1136/bmjopen-2019-033687 46 SharabiA.CohenE.SulkesJ.GartyM

This happens because a lack of B12 disrupts their normal development, and its a major clue that something is amiss

Vitamin B12 injections are generally considered to be very effective and almost always totally risk-free
It may take 48 to 72 hours for the vitamin to disperse throughout the body via the circulatory system
