Vitamin B12 is known as the "energy vitamin," and it is essential for many critical functions in your body, including energy production, supporting your immune system, and helping to regulate the formation of red blood cells.* Recent studies from the US Framingham trial show that one in four adults in the US are deficient in this vitally important nutrient and nearly half of the population has suboptimal blood levels.
Vitamin B12 is present only in animal sources of food--which is one of the reasons I advise against being a strict vegetarian or a vegan. This deficiency can result in less than optimal nervous system function, a tendency toward nervousness, and even less-than-optimal eye health.* 
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