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Cyclopentasiloxane

* A silicone. See Truth In Aging’s article on silicone safety.

In beauty products, cyclopentasiloxane is mainly used as a conditioner, delivery agent, lubricant and solvent. 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 slippery feeling to the touch and acts a mild water repellent by forming a protective barrier on the skin. It can also fill in fine lines and wrinkles, giving the face a temporary “plump” look.

* A silicone. See Truth In Aging’s article on silicone safety.

Functions:

In beauty products, cyclopentasiloxane is mainly used as a conditioner, delivery agent, lubricant and solvent. 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 slippery feeling to the touch and acts a mild water repellent by forming a protective barrier on the skin. It can also fill in fine lines and wrinkles, giving the face a temporary “plump” look.

Its ability to impart a wet and silky look makes it an ideal candidate in hair products, both rinse-off and leave-on ones. It’s particularly useful in hair conditioners because it provides a silky feel without weighing the hair down with greasy residue. Because of its water-thin consistency, it helps deliver heavier silicones also contained in a product; for this reason, is often used in conjunction with dimethicone. In fact, as a volatile silicone it quickly evaporates into the air after delivering nutrients to the skin and hair. You can mostly find this ingredient in products such as foundation, facial moisturizer/lotion, hair dye, shampoo/conditioner, styling gel, anti-frizz treatment, sunscreen, anti-aging treatment and deodorant/antiperspirant.

Safety Measures/Side Effects:

While silicones such as cyclopentasiloxane do not appear to have adverse effects on the human body, according to an EU report from 2015 (source), there are many concerns regarding the harmful effects it may have on the environment (i.e. marine life). The Canadian regulatory authorities have concluded that D5 was not a danger to the environment (source).

Cyclopentasiloxane may cause mild skin and eye irritation, according to the ingredient’s material safety data sheet, and a small percentage of it reaches systemic circulation through dermal absorption, as found in a study by the Department of Environmental and Radiological Health Sciences.

Sister chemicals are Octamethylcyclotetrasiloxane (known as D4) and Decamethylcyclopentasiloxane (known as D5). The European Union has ruled that it is limiting the amount of D4 and D5 in rinse-off products to 0.1% by 2020 as they are considered to be PBTs and a vPvB - "Persistent, Bioaccumulative and Toxic" and "very Persistent and very Bio-accumulative", terms that are applied to chemicals that don't easily breakdown in the environment. In 2018 European Chemicals Agency added D5,to 10 "New Substances of Very High Concern" (source)

Products on TIA w/Cyclopentasiloxane:

Medik8 Firewall ($145 in the shop), Medik8 Red Alert ($60 in the shop), Skinfinite Platinum PM Cream 1% Retinol ($79 in the shop)

As much as possible, products in the Truth In Aging shop are chosen for their safety profile as well as effectiveness.

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