Solgar Vitamin B12 1000mcg Chewable is a dietary supplement rich in cyanocobalamin, which helps reduce tiredness and fatigue. Vitamin B12 is necessary for the formation of red blood cells in the bone marrow. A deficiency of this vitamin can lead to pernicious anemia (different from anemia due to iron deficiency). It allows folic acid to be reactivated, so B12 deficiency can lead to symptoms of deficiency of this vitamin.