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Considerably more people than previously believed are allergic to the most common fragrance ingredient used in shampoos, conditioners and soap. In a study, over 5 percent of those who underwent patch testing were allergic to the air oxidized form of the fragrance ingredient linalool.
Linalool is found in 60 to 80 percent of perfumed hygiene products, soap and household cleaning agents that can be bought in the supermarket, so it can be difficult for people who are allergic to avoid these products.