Source Naturals Hydroxocobalamin B-12 supports brain health and energy levels with a meaningful dose of B-12 in a convenient lozenge form. This is especially helpful for adults 50 years and older who may need assistance in meeting their RDA requirements. Hydroxocobalamin is a natural transport form of B-12 in the blood that is converted into the coenzyme forms of methylcobalamin or adenosylcobalamin inside the cell. Vitamin B-12 helps support normal homocysteine levels, healthy brain cells and nerve tissues, and the production of red blood cells that carry oxygen to the cells and tissues.*