8,15 Serum holotranscobalamin level, which is reduced in vitamin B 12 deficiency, compared favorably with homocysteine and methylmalonic acid levels as a confirmatory test in one study, but further trials are needed before its widespread use for this purpose can be recommended
That data wasnt always included in the FDA scientists presentations a decision that rankled some committee members
Rastegar-Moghaddam SH, Ebrahimzadeh-Bideskan A, Shahba S et al (2023) Roles of the miR-155 in neuroinflammation and neurological disorders: a potent biological and therapeutic target
[31] The products are usually extracted and purified by phenol-methylene chloride extraction or by column chromatography
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This makes B12 supplementation generally safe, even at doses exceeding the recommended daily intake