Pure Lab Vitamins Bioactive B Complex - Balanced vitamin B complex in their active form help metabolize carbohydrates, proteins and fats for energy, tissue support and red blood cell formation. B vitamins are responsible for a myriad of functions in the body. As our lives become more stressful and urgent, water-soluble B vitamins are quickly exhausted. Pure Lab has created a unique, slow-release formula that comprises the key b-nutrients in their bioavailable, co-enzyme form. This slow-release formula ensures that more Bs are in circulation when the body requires them.