From the Manufacturer's Label:
Jarrow Fomulas d-Limonene is steam-distilled from orange peel and is purified to be food grade. Jarrow d-Limonene is the major constituent of several citrus essential oils (orange, lemon and lime), and naturally occurs in citrus juices.
Manufactured by Jarrow Formulas
No wheat, no gluten, no soybeans, no dairy, no egg, no fish/shellfish, no peanuts/tree nuts.