Vitamin B12 or Cobalamin is one of the necessary vitamins required for the healthy body. It helps in the proper functioning of nerve tissues, brain and the production of RBCs.(
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Foods that contain B12 are--
. Fish
.Beef
.Pork
.dairy products such as milk, yogurt etc
.eggs
.lamb
There are other foods also which contains B12.
By taking a good amount of the above-listed food can help in the normal functioning of brain and nerve tissues.
Apart from that, it increases your energy level.
Symptoms wise, there is no such specific symptom but fatigue, weakness, loss of appetite, confusion, depression, pale skin etc, until and unless properly diagnosed and found that vitamin B12 is one of the reason.