Jarrow Formulas® d-Limonene provides relief of occasional, mild esophageal and stomach discomfort.* As a triterpene lactone, d-Limonene also supports the liver’s detoxifying Phase I and Phase II enzyme systems.* Jarrow Formulas® d-Limonene is steam-distilled from orange peel and purified. d-Limonene is the major constituent of citrus essential oils.