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lemon

Citrus fruit that’s a potent skin sensitizer.The juice from lemon is often touted as being a natural option for brightening skin. The truth is that lemon juice is highly acidic (has a very low pH of 2) and exceedingly sensitizing to skin. Lemon juice applied to skin can cause photosensitivty on exposure to sunlight, which is due to a volatile fragrance chemical known as limonene, which is abundant in lemon juice. Lemon, whether in juice or oil form, is a must to avoid in cosmetics. 

Reference for this information:

Journal of American Academy of Dermatology, 2002, issue 5, pages 709-714

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Paula Begoun is the best-selling author of 20 books about skincare and makeup. She is known worldwide as The Cosmetics Cop and creator of Paula’s Choice Skincare. Paula’s expertise has led to hundreds of appearances on national and international radio, print, and television including:

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The Paula's Choice Research Team is dedicated to busting beauty myths and providing expert advice that solves your skincare frustrations so you can have the best skin of your life!