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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
When Supplements May Be the Better Option Supplements may be more suitable when someone has no symptoms, wants to maintain dietary intake, follows a vegan diet and can take tablets consistently, or has been advised by a healthcare professional that oral supplementation is appropriate
The mechanism is well-motivated
Clinical research has generally demonstrated favorable tolerability, though individual responses vary
Woodward (1973)"
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