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For example, no reaction occurs between neopentyl chloride and B 12s , whereas the secondary alkyl halide analogs are too unstable to be isolated

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For example, an analysis of cross-sectional 20112014 NHANES data on 2,420 adults age 60 years or older found that low vitamin B12 (MMA greater than 0.27 micromol/L or serum vitamin B12 less than 203 pg/mL [150 pmol/L]) combined with high folic acidunmetabolized serum folic acid greater than 0.44 mcg/L (1 nmol/L) or serum total folate higher than 32.7 mcg/L (74.1 nmol/L)was associated with an almost two to three times higher risk of cognitive impairment [84]

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They also play a role in the production of red blood cells, which are essential for transporting oxygen throughout the body

In one large study involving 4,281 participants, researchers compared vitamin B12 levels in people receiving intramuscular injections with those taking sublingual methylcobalamin