Dietary supplement. Packaged in a glass bottle for maximum stability, quality and freshness. This product is manufactured at our own state of the art facility. Twin Lab Potassium Caps are easier to swallow and assimilate. Well tolerated by most highly allergic individuals. No tablet binders, coatings or colorings. Free of the most common allergies such as corn, soy, yeast, rice, barley, wheat, lactose (milk sugar) and all milk, citrus, fish and egg products. No added flavorings, sugars, salt, artificial sweeteners, colorings, preservatives or salicylates.