Categories: Fragrance: Synthetic and Fragrant Plant Extracts, Sensitizing
Chemical constituent of many natural fragrant ingredients, notably citrus oils such as lemon (d-limonene) and pine trees or species of the mint family (l-limonene).
Topically, limonene can cause sensitivity and is best avoided. Also, because of its penetration-enhancing effects on skin, it’s particularly important to avoid products that contain limonene plus other skin sensitizers like denatured alcohol.
Source: Paula's choice