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Evidence exists linking elevated homocysteine levels with vascular dementia [10] and Alzheimer's disease. [11] [12] [13] There is also evidence that elevated homocysteine levels and low levels of vitamin B6 and B12 are risk factors for mild cognitive impairment and dementia. [14]
Serum vitamin B 12 is a medical laboratory test that measure vitamin B 12 only in the blood binding to both transcobalamins. [1] Most of the time, 80–94% of vitamin B 12 in the blood binds to haptocorrin, while only 6–20% is binds to transcobalamin ll. [2] Only transcobalamin ll is "active" and can be used by the body. [1]
6947 n/a Ensembl ENSG00000134827 n/a UniProt P20061 n/a RefSeq (mRNA) NM_001062 n/a RefSeq (protein) NP_001053 n/a Location (UCSC) Chr 11: 59.85 – 59.87 Mb n/a PubMed search n/a Wikidata View/Edit Human Haptocorrin (HC) also known as transcobalamin-1 (TC-1) or cobalophilin is a transcobalamin protein that in humans is encoded by the TCN1 gene. One essential function of haptocorrin is ...
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Reduced serum levels of vitamin B 12 occur in up to 30% of people taking long-term anti-diabetic metformin. [105] [106] Deficiency does not develop if dietary intake of vitamin B 12 is adequate or prophylactic B 12 supplementation is given. If the deficiency is detected, metformin can be continued while the deficiency is corrected with B 12 ...
Again, the daily recommended dietary allowance of vitamin B12 for most adults is 2.4 micrograms, stretching up to 2.6 and 2.8 micrograms if you’re pregnant or nursing.
Homocysteine levels typically are higher in men than women, and increase with age. [15] [16] Common levels in Western populations are 10 to 12 μmol/L, and levels of 20 μmol/L are found in populations with low B-vitamin intakes or in the elderly (e.g., Rotterdam, Framingham). [17] [18]
A vitamin B12 level of less than 200 pg/mL is considered deficient. Treatment First, have your health care provider run blood tests to see if you truly have a B12 deficiency.