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Serum methylmalonic acid and holotranscobalamin-II as markers for vitamin B 12 deficiency in end-stage renal disease patients Ann Clin Lab Sci 2013;43:243-9

DACH-LIGA homocystein (german, austrian and swiss homocysteine society): consensus paper on the rational clinical use of homocysteine, folic acid and B-vitamins in cardiovascular and thrombotic diseases: guidelines and recommendations

Common risk factors include: A plant-based or vegan diet Digestive conditions like Crohns disease or IBS Long-term use of metformin or acid-reducing medications Aging (B12 absorption naturally declines over time) Chronic stress and poor sleep Why oral B12 supplements often fall short Oral supplements are widely available but their biggest limitation is B12 absorption

Numerous studies find that elevated B12 levels are associated with various diseases, including liver and kidney disease