Efficacy and role of cyclopentasiloxane in skin care cosmetics Cyclopentasiloxane, English name is CYCLOPENTASILOXANE, alias: Decamethylcyclopentasiloxane. Cyclopentameric dimethyl siloxane is mainly used in cosmetics and skin care products as thickener, solvent and emollient. The risk factor is 3. It is relatively safe and can be used with confidence. Generally, it has no effect on pregnant women. Siloxanes are not acne-causing.

Cyclopentasiloxane, a kind of synthetic silicone oil, referred to as D5, is widely used in cosmetics and human care products. The ingredient is colorless, odorless, and volatile. It is often added to serums, lotions, foundations, makeup primers and conditioners to produce a smooth and silky feel. D5 has a large molecular weight, is easily volatile, and cannot be absorbed by the skin. Status of laws and regulations in various countries: The Canadian Environmental Protection Act CEPA declared D4 and D5 as toxic ingredients in 2011, which are prohibited from being added to skin care products. The main reason is that D5 is very difficult to degrade, and has bioaccumulation in organisms, which is harmful to fish and aquatic animals, and is widely used, but it is not proposed that D5 is harmful to humans. In February 2012, the Canadian government announced that it had removed D5 from the CEPA toxic list and resumed its normal use. The EU chemical management project REACH has identified D5 as vPvB (highly persistent, bioaccumulative substances). The United Kingdom has applied to REACH to prohibit the addition of D5 in wash-off products. The European Chemicals Agency is currently reviewing and is expected to be in 2016. Review comments were made in March of this year. In Japan, D5 was added to the chemical review list in 2010, and the preliminary review was completed in May 2012, and further evaluation is still underway.
Cyclopentasiloxane ingredients are suitable for 7 types of skin: non-pigmented skin, sensitive skin, tolerance skin, dry skin, pigmented skin, firm skin, and wrinkled skin.