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Where serum B12 results are borderline or do not fit the clinical picture, further tests such as active B12 (holotranscobalamin), methylmalonic acid, or homocysteine may be helpful
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2015;191:A4144 Blackman A, Foster GD, Zammit G, et al
PMID 25957927
Glutathione has also been studied for other skin conditions besides eczema
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