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The key ingredient in orange peel extract is the chemical compound d-limonene. d-Limonene (1-methyl-4-isopropenyl-1-cyclohexene) is a liquid with a lemonlike odor. It is a major constituent in several citrus oils (orange, lemon, mandarin, lime, and grapefruit) and is present in a number of other essential oils, as well. best heartburn treatment d-Limonene is included on the Food and Drug Administration’s (FDA’s) Generally Recognized as Safe List and is approved for use by the FDA as a food additive (Opdyke, 1975). d-Limonene has a boiling point of 176 C and a vapor pressure of <3 mmHg at 14 C. d-Limonene is used primarily as a flavor and fragrance ingredient.