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Dietary SupplementSource 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 the form of B-12 that is transported in the blood before it 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.