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Polymethylsilsesquioxane

* A silicone * Please read TIA's post on What Is It: Silicones and Should We Avoid Them

Polymethylsilsesquioxane is a silicone ingredient used in many skin care, hair care, and cosmetic formulas, most often as a film former that creates a lubricating, smooth, silky feel and increases the skin or hair's ability to repel water, according to Marshall Brain, the founder of How Stuff Works. It is is a "spherical, fine particle silicone resin" that is comprised of very small particles, and therefore easily distributed in formulas. In a study done by Grant Inc., a company responsible for cosmetic development, Polymethylsilsesquioxane can be used in particles as small as less than 10 microns, and can impart anti-caking and slip properties to the skin in hair, in addition to its lubrication and water repellent abilities.

* A silicone

* Please read TIA's post on What Is It: Silicones and Should We Avoid Them

Functions:

Polymethylsilsesquioxane is a silicone ingredient used in many skin care, hair care, and cosmetic formulas, most often as a film former that creates a lubricating, smooth, silky feel and increases the skin or hair's ability to repel water, according to Marshall Brain, the founder of How Stuff Works. It is is a "spherical, fine particle silicone resin" that is comprised of very small particles, and therefore easily distributed in formulas. In a study done by Grant Inc., a company responsible for cosmetic development, Polymethylsilsesquioxane can be used in particles as small as less than 10 microns, and can impart anti-caking and slip properties to the skin in hair, in addition to its lubrication and water repellent abilities.

Safety Measures/Side Effects:

Polydimethylsiloxane is considered to be a 100% safe ingredient by the Cosmetics Database.

Although a large amount of research has connected silicones to cancer and organ failure, it is generally considered to be a hazardous ingredient when injected into the skin or body, but not when applied topically. Many studies find silicones, including Polymethylsilsesquioxane, to be safe when used in the body as well, including a study published in the New England Journal of Medicine, in which after a 14 year study of over 1,000 women with breast implants, a team of researchers and doctors concluded that "we did not find an association between silicone breast implants and connective-tissue diseases, defined according to a variety of standardized criteria, or signs and symptoms of these diseases."

According to Marta's post on silicones, it's been determined that silicones do not cause allergic reactions, although they do remain on or near the skin's surface. Silicone molecules, like those found in Polymethylsilsesquioxane, are too large to penetrate the skin and the cell membranes. However, they can increase the ability for other ingredients with smaller molecules to penetrate the skin, and can make it susceptible to toxins.

Recommended Products w/ Polymethylsilsesquioxane:

tarte’s Vitamin-Infused Lipstick , Awake Stardom Escalate Lash Mascara
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