Dimethicone

Dimethicone is a controversial ingredient found in a many skin care products. While many beauty and skincare bloggers argue that its silicone base and synthetic qualities make it a red flag, there is no hard evidence to suggest it is an irritant or that it causes acne. In low quantities, it can't "trap in sweat and dirt" or form a "plastic-like layer on the skin". It is rated safe and non-irritating by multiple peer-reviewed and evidence based parties. One even concluded that it had protective qualities against irritants.

http://www.skintherapyletter.com/2017/22.3/2.html

https://www.google.com/patents/US8987180

http://www.ingentaconnect.com/content/wk/won/2015/00000042/00000005/art00012

https://www.webmd.com/drugs/2/drug-18321/dimethicone-topical/details#uses

http://europepmc.org/abstract/med/16439809

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