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Traverso, N., et al., Role of Glutathione in Cancer Progression and Chemoresistance
(PubMed) Spence JD
Vitamin B12 is required for concentration and cognitive procedures, such as learning, so a vitamin B12 deficiency can cause trouble focusing and an increased danger for attention disorders
You'll also have to consider where you'll be inserting the needle
New England Journal of Medicine , 390(8), 701-714
Maybe youve tried vitamin B12 sublingual or other oral forms
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