What is vitamin B12 (cobalamin)?

Vitamin B12 is breaks down fatty acids and helps release and use the energy from food sources throughout the body. (1) Vitamin B12 helps with DNA synthesis, proper nervous system functioning, increasing concentration, alertness and memory. (1
Vitamin B12 is a type of water-soluble vitamin. (1)

Vitamin B12 is also known as cobalamin.

What does vitamin B12 do?
Vitamin B12 breaks down homocysteine. (2)
helps the body make red blood cells and DNA (4)
helps the body keep the nerve cells and blood cells healthy (4)
Once ingested, vitamin B12 combines with intrinsic factor. (5)

How is vitamin B12 produced?
Vitamin B12 is not produced BY animals or plants. (5)
Bacteria synthesize vitamin B12. (5)
Natural, unfiltered water contains vitamin B12. (5)

What foods contain Vitamin B12? 

Bioavailability 

Heat (cooking)

What happens if you have a deficency of vitamin B12?

Where is vitamin B12 absorbed?
Vitamin B12 is absorbed in the ileum. (3)

Vitamin B12 and Humans

Resources: 
1. https://www.sportskeeda.com/health-and-fitness/is-vitamin-b12-only-available-animals-5-best-sources-b12
2. https://drwillcole.com/gut-health/homocysteine-levels-what-they-mean-why-they-matter
3. https://www.kenhub.com/en/library/anatomy/the-small-intestine
4. https://my.clevelandclinic.org/health/diseases/22831-vitamin-b12-deficiency
5. https://www.webmd.com/diet/features/b12-truths-myths

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