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en.wikipedia.org/wiki/Vitamin_B12_deficiency

Vitamin B12 deficiency can lead to anemia and neurologic dysfunction. A mild deficiency may not cause any discernible ...

www.webmd.com/diet/vitamin-b12-deficiency-symptoms-causes

Apr 19, 2017 ... Vitamin B12 is essential for good health, but some people may not be getting enough. WebMD tells you about symptoms of a vitamin B12 ...

www.prevention.com/health/signs-of-b12-deficiency

Nov 6, 2015 ... Could you be vitamin B12 deficient? ... signs of b12 deficiency ... But celebrating another birthday isn't the only cause: Avoiding meat, taking ...

www.health.harvard.edu/blog/vitamin-b12-deficiency-can-be-sneaky-harmful-201301105780

May 4, 2017 ... There are many causes for vitamin B12 deficiency. Surprisingly, two of them are practices often undertaken to improve health: a vegetarian diet ...

www.mayoclinic.org/diseases-conditions/vitamin-deficiency-anemia/symptoms-causes/dxc-20265323

Nov 9, 2016 ... Vitamin B-12 deficiency can also be caused by a tapeworm ingested from contaminated fish, because the tapeworm saps nutrients from your ...

www.health.com/health/gallery/0,,20924065,00.html

Jun 24, 2015 ... You can eat a ton of veggies and STILL not get enough vitamin B12. Here are the risks, symptoms, and ways to treat a deficiency.

www.medicalnewstoday.com/articles/219822.php

Vitamin B12 deficiency can result in irreversible and potentially ... More serious symptoms include neurological changes, such as ...

www.nhs.uk/Conditions/Anaemia-vitamin-B12-and-folate-deficiency/Pages/Symptoms.aspx

Vitamin B12 or folate deficiency anaemia can cause a wide range of symptoms. These usually develop gradually but can worsen if the condition goes untreated.

www.nhs.uk/Conditions/Anaemia-vitamin-B12-and-folate-deficiency/Pages/Causes.aspx

Vitamin B12 or folate deficiency anaemia occurs when a lack of either of these vitamins affects the body's ability to produce fully functioning red blood cells.