Dietary supplement. Free from amino acid. TwinLab L-Carnitine Capsules are easier to swallow and assimilate. TwinLab L-Carnitine Capsules contain no synthetic d-carnitine or dl-carnitine. D-carnitine and dl-carnitine are less effective than l-carnitine. D-carnitine and dl-carnitine are not recommended because of their adverse physical side effects. Well tolerated by most highly allergic individuals. No tablet binders, coatings or colorings. Free of most common allergens such as corn, soy, yeast, rice, barley, wheat, lactose (milk sugar) and all milk, citrus, fish and egg products. No added flavorings, preservatives or salicylates. This product is manufactured at our own state of the art facility.