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Vitamin B12 plays a crucial role in the nervous system and if left untreated the deficiency can cause long-term problems
B12 injections are the gold-standard treatment because they bypass this broken absorption system entirely
Neurosci ., 53 , 211213
It is a mitochondrial (energy) form of B12 that is usually great for people who have general tiredness/fatigue or they are easily fatigued with small amounts of exercise
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