Cobalamin or vitamin B12 is considered to be the energy vitamin. Vitamin B12 has a lot of important responsibilities to help your body function properly. Cobalamin is vital to the creation of red blood cells and DNA. If you feel tired or light-headed all the time, you might have low B12 levels. If you leave a B12 deficiency unchecked, it can progress into depression and numbness. Amazingly, in one small serving of mackerel, you will receive over 100 percent of your daily recommended dosage of vitamin B12.

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