Skin- care professionals warn that it can clog skin because the molecules are so large. It's the same product used as anti-freeze. It's used in antiperspirants, suntan lotions, lipsticks and hair care products. The National Toxicology Program classifies it as a skin and eye irritant. It's used in shampoos, toothpastes, bubble baths, and lotions.
Opinion is mixed.
The National Toxicology Program classifies it as a skin and eye irritant, and studies have linked it to canker sores. It may also lead to the formation of nitrosamines, possible cancer-causing substances. A 1983 panel of physicians and scientists said it's safe as long as you rinse it off quickly. This advice is disturbing because it implies it is dangerous, just less dangerous if you remove it quickly. It's used in makeup, body powders and some supplements.