Vitamin B12 and Humans

What is the RDA for humans for Vitamin B12?

Where is Vitamin B12 stored in a human? 
Vitamin B12 is stored in the liver until it is needed by cells. (1)

What happens if a person has a deficiency of vitamin B12?
can cause physical, neurological, and psychological symptoms (4)
a lack of vitamin B12 can cause anemia (4)
Symptoms:
numbness or tingling in the hands and feet (4)
vision problems (4)
having a hard time remembering things or getting confused easily (4)
having a difficult time walking or speaking like you usually do (4)
feeling depressed (4)
feeling irritable (4)
experiencing a change in the way you feel and behave (4)

Resources: 
1. https://www.sportskeeda.com/health-and-fitness/is-vitamin-b12-only-available-animals-5-best-sources-b12
4. https://my.clevelandclinic.org/health/diseases/22831-vitamin-b12-deficiency

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