WHAT IS IT? Decamethylcyclopentasiloxane is a silicone fluid commonly used in cosmetics such as deodorants, sunblocks, hair sprays and skin care products to lubricate, waterproof and provide shine. Like all other silicones, this ingredient has a unique fluidity that makes it easily spreadable. When applied to the skin and hair, it gives a silky and soft feeling to the touch and acts as a mild water repellent by forming a protective barrier on the skin. This toxic chemical is becoming more common in hair conditioners, as it makes the hair easier to brush without breakage.

HEALTH RISK: Suspected endocrine disrupter and reproductive toxicant (cyclotetrasiloxane). Ecotoxicology – harmful to fish and other wildlife. If you use too much on your skin, it can stay in your body tissue for over 5 years. CPS clinical studies found that, when tested on animals, this product produced tumors, endocrine disruption, neurotoxicity (damage to the brain and peripheral nervous system), organ toxicity (non-reproductive) and skin irritation. Seems like high prices to pay for “soft and silky” hair and skin!

HOW TO AVOID: Decamethylcyclopentasiloxane can also be listed as D5. Read labels on sunscreens and hair products and avoid products that list this as an ingredient.