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Hyperhomocysteinemia is a medical condition characterized by an abnormally high level of total homocysteine (that is, including homocystine and homocysteine-cysteine disulfide) in the blood, conventionally described as above 15 μmol/L. [1]
Methylenetetrahydrofolate reductase deficiency is the most common genetic cause of elevated serum levels of homocysteine (hyperhomocysteinemia). It is caused by genetic defects in MTHFR, which is an important enzyme in the methyl cycle. [1] Common variants of MTHFR deficiency are asymptomatic and have only minor effects on disease risk. [2]
Total plasma homocysteine. 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]
Beyond adverse effects from the herb itself, "adulteration, inappropriate formulation, or lack of understanding of plant and drug interactions have led to adverse reactions that are sometimes life threatening or lethal." [3]
Treatment should take into account the cause and severity of the condition. [6] Treatment is done by vitamin B 12 supplementation, either by mouth or by injection. [3] Initially in high daily doses, followed by less frequent lower doses, as the condition improves. [3] If a reversible cause is found, that cause should be corrected if possible. [11]
There are not enough studies on whether pills are as effective in improving or eliminating symptoms as parenteral treatment. [12] Folate supplementation may affect the course and treatment of pernicious anemia if vitamin B 12 not replaced. [65] In some severe cases of anemia, a blood transfusion may be needed to resolve haematological effects. [5]
Folic acid supplements have little established role in cancer chemotherapy. [60] [61] The supplement of folinic acid in people undergoing methotrexate treatment is to give less rapidly dividing cells enough folate to maintain normal cell functions. The amount of folate given is quickly depleted by rapidly dividing (cancer) cells, so this does ...
"B12" and "Cbl" redirect here. For other uses of B12, see B12 (disambiguation). For the musical group, see Carbon Based Lifeforms. Pharmaceutical compound Vitamin B12 General skeletal formula of cobalamins Stick model of cyanocobalamin (R = CN) based on the crystal structure Clinical data Other names Vitamin B12, vitamin B-12, cobalamin AHFS / Drugs.com Monograph MedlinePlus a605007 License ...