In such cases, your doctor might even prescribe B12 injections for you to take at home, with the frequency depending on your individual needs
However, for those supplementing, high B12 levels are generally a reflection of recent supplementation, not a cause for concern
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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
It should be used regularly at evenly spaced time intervals as prescribed by your doctor