Vitamin B12 is one of the best known vitamins for energy.* It helps convert food into energy your cells can use to power your body.** But did you know this essential B vitamin is also important for optimal heart, circulatory and nervous system health* Vitamin B12 helps to maintain healthy blood levels already within a normal range of the amino acid, homocysteine.* High levels of homocysteine are believed to affect the function of the cardiovascular system. Some research also indicates healthy homocysteine levels are correlated with favorable cognitive health. Vegetarians and vegans may have a difficult time getting adequate amounts of this essential vitamin through food alone. The bodys ability to absorb vitamin B12 naturally present in foods becomes less efficient with age.