Jarrow FORMULAS d-Limonene is an essential oil that stimulates the livers Phase I and Phase II detoxifying enzyme systems and supports normal immune function. Jarrow FORMULAS d-Limonene is steam-distilled from orange peel and is purified to be food grade. d-Limonene is the major constituent of several citrus essential oils (orange lemon and lime) and naturally occurs in citrus juices.Store in a cool dry place.Other products from HerbsPro