| 11. | Vitamin B12 is produced by the fermentation of bacteria and microorganisms.
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| 12. | _Vitamin B12 : RDA, 2.4 micrograms, the amount in 3 ounces of beef.
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| 13. | Vitamin B12 and folate may be important for cognitive function in old age.
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| 14. | This can be one of the causes of vitamin B12 deficiency.
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| 15. | A doctor injected Williams with two shots of vitamin B12 that contained morphine.
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| 16. | The illness was later determined to be a vitamin B12 deficiency.
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| 17. | They are also a good source of vitamin D, calcium, vitamin B12, and protein.
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| 18. | Years later it was discovered that the required factor was vitamin B12, or cyanocobalamin.
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| 19. | Deficiencies in zinc, iron and vitamin B12 are, however, common nutritional deficiencies in vegetarians.
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| 20. | Vitamin B12 is depleted by recreational use of nitrous oxide, and is thereby useful.
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