Lojo, N., Medvidovic-Grubisic, M., & Drmic, D
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A deficiency of vitamin B12 is fairly difficult to diagnose and there are quite a few variables that can lead to the deficiency or just not quite having enough of it regularly, so injections of vitamin B12 can benefit quite a few people who suffer from symptoms including brain fog, fatigue, lethargy, feelings of depression, tingling in their hands or feet, dizziness, and memory loss
Bibcode:1993PApCh..65.1113B
The deficiency is isolated to B12 without the need for multi-nutrient replenishment