can vitamin b12 injection cause diarrhea Side Effects B12 Shots Side Effects And
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In other words, we cant directly extrapolate recommendations for vegans from the trials in the graphs above except to know that 500 g per day is enough for vegans based on Crane, 1998

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Isn't there a risk that you may not be able to close the substance loss

turn the solution container upside down and slowly pull on the plunger to withdraw the desired dosage of vitamin B12 into the syringe
The B vitamins contained in Neurobion Forte RF are safe and usually don't cause side effects when taken as per doctor's recommendation