If wearing perfume triggers headaches or makes you feel ill, there are two options for you. One is to look for Department of Agriculture-certified organic scents, which use food-grade natural oils free of any synthetic chemicals. Just like how produce with the USDA certified organic mark must be proven to be grown without chemical pesticides or herbicides, the same rules apply to organic fragrances. If you can't find an organic scent you like, another option would be to wear single-note scents or absolutes. Traditional perfumes use about 200 chemicals to create their complicated scents; a single note -- like sandalwood or rose -- uses significantly less and may be a calmer alternative to help you smell delicious and fresh.