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  2. Vitamin B12 deficiency - Wikipedia

    en.wikipedia.org/wiki/Vitamin_B12_deficiency

    Vitamin B 12 deficiency can be determined, but not always. [14] This means it measures forms of vitamin B 12 that are "active" and can be used by the body, as well as the "inactive" forms, which cannot. [151] Vitamin B 12 deficiency can be found within normal levels, so clinical symptoms should be taken into account when a diagnosis is made. [2]

  3. Pernicious anemia - Wikipedia

    en.wikipedia.org/wiki/Pernicious_anemia

    [56] [57] Low levels of serum vitamin B 12 may be caused by other factors than B 12 deficiency, such as folate deficiency, pregnancy, oral contraceptive use, haptocorrin deficiency, and myeloma. [57] High serum levels may caused by supplementing with vitamin B 12, present of antibodies to intrinsic factor, or due to underlying condition. [56]

  4. Vitamin B12 - Wikipedia

    en.wikipedia.org/wiki/Vitamin_B12

    "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 ...

  5. The Top Signs You Have a Vitamin B12 Deficiency - AOL

    www.aol.com/top-sign-vitamin-b12-deficiency...

    The Good Housekeeping Institute tested more than 30 brands of B12 supplements, and chose Nature made B12 1000mcg as the best overall option, and Garden of Life Vitamin Code Raw B12 as the best ...

  6. Toxic and nutritional optic neuropathy - Wikipedia

    en.wikipedia.org/wiki/Toxic_and_nutritional...

    The predominant cause of nutritional optic neuropathy is thought to be deficiency of B-complex vitamins, particularly thiamine [2] (vitamin B 1), cyanocobalamin (vitamin B 12) and recently copper. [3] Deficiency of pyridoxine (vitamin B 6), niacin (vitamin B 3), riboflavin (vitamin B 2), and/or folic acid also seems to play a role. Those ...

  7. Optic neuropathy - Wikipedia

    en.wikipedia.org/wiki/Optic_neuropathy

    Undernourished patients often have many vitamin and nutrient deficiencies and have low serum protein levels. However, the optic neuropathy associated with pernicious anemia and vitamin B 12 deficiency can even be seen in well-nourished individuals. Gastric bypass surgery may also cause a vitamin B 12 deficiency from poor absorption.

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  9. Subacute combined degeneration of spinal cord - Wikipedia

    en.wikipedia.org/wiki/Subacute_combined...

    Vision changes and change of mental state may also be present. Bilateral spastic paresis may develop and pressure, vibration, and touch sense are diminished. A positive Babinski sign may be seen. [7] Prolonged deficiency of vitamin B 12 leads to irreversible nervous system damage.

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