Do You Know Whats In Your Shampoo
"Siloxanes". Anything that ends in “-siloxane” or “-methicone” falls into this category. These chemicals are used as moisturizers in makeup and hair-care products, but they may also interfere with hormone function and damage your liver.
*Cyclomethicone and ingredients ending in "siloxane" (e.g., cyclotetrasiloxane)
Use in Cosmetics
These silicone-based compounds are used in cosmetics to soften, smooth, and moisten. They make hair products dry more quickly and deodorant creams slide on more easily. They are also used extensively in moisturizers and facial treatments. Siloxanes can also be found in medical implants, water-repelling windshield coatings, building sealants and lubricants.
Health and Environmental Hazards
Environment Canada assessments concluded that cyclotetrasiloxane and cylcopentasiloxane — also known as D4 and D5 — are toxic, persistent, and have the potential to bioaccumulate in aquatic organisms i,ii . Also, the European Union classifies D4 as a endocrine disruptor, based on evidence that it interferes with human hormone function iii , and a possible reproductive toxicant that may impair human fertility iv . In laboratory experiments, exposure to high doses of D5 has been shown to cause uterine tumours and harm to the reproductive and immune systems. D5 can also influence neurotransmitters in the nervous system v .
Structurally similar to D4 and D5, cyclohexasiloxane (or D6) is also persistent and has the potential to bioaccumulate. Environment Canada's assessment of D6 concluded that this third siloxane is not entering the environment in a quantity or concentration that endangers human health or the environment, but noted significant data gaps concerning its toxicity vi.
Cyclomethicone is a mixture of D4, D5, and D6 siloxanes.
Posted By David Suzuki read more at http://davidsuzuki.org
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