Dietary Supplement. Vitamin B-Complex. TwinLab B-50 Caps provide a high potency, synergistic combination of B-Vitamins. TwinLab B-50 Caps are easier to swallow and assimilate. Well tolerated by most highly allergic individuals. No tablet binders, coatings or colorings. No added sugars, salt, artificial sweeteners, colorings, preservatives or salicylates.