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Some, like vitamin B, are necessary to survive.

Long-term use can also cause a deficiency of vitamin B-12, which leads to reduced white blood cell count and anemia.

The gum contains green tea and vitamin B, and the company promotes those ingredients as a way to help improve focus.

However, women who took high doses of vitamin B-12 supplements during lactation experienced these benefits for a longer period of time.

Another interesting trait of comfrey is that in addition to producing vitamin C and all of the other plant based vitamins, it is the only land-based plant that produces vitamin B-12.