Aller-B 90ct Caps by Progressive LabsAller B is a high potency B complex in capsule form containing no allergy provoking fillers and binders. B complex vitamins support nervous system function. The need for these essential vitamins increases during periods of mental or physical stress. All the B vitamins should be taken together. Since these vitamins are so closely interrelated in function, a lack of one or more can affect the body's utilization of others. If large doses of one of the