Toxic Tuesday Ingredient Focus: Decamethylcyclopentasiloxane

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.

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  1. Great info! We’re with you on the mission of non-toxic beauty products. We’ve shared a some of our natural makeup choices here http://sisterdisco.com/2011/10/30/ms-clean/

  2. You may be confused, cyclotetrasiloxane is D4 and has been eliminated from cosmetics; D5 cyclopentasiloxane is safe and especially useful in anti-perspirant sticks. See the Environmental Working Group take on it, low concern http://www.ewg.org/skindeep/ingredient/701741/CYCLOPENTASILOXANE/.

    Charles | 07.01.2014 | Reply
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  4. […] Aluminum Zirconium Trichlorohydrex Gly, Cyclopentasiloxane, Stearyl Alcohol, C12-15 Alkyl Benzoate, PPG-14 Butyl Ether, Hydrogenated Castor Oil, Petrolatum, […]


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