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* A synthetic silicone oil. See TIA’s Silicone safety article.


Works in a variety ways, namely as a conditioning agent, solvent, humectant, carrying agent and viscosity controlling agent. 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 & 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/wrinkles, giving the face a temporary “plump” look.

Because its molecules are too big to physically penetrate the skin, it does not have any true moisturizing properties, but rather mostly functions as a carrying agent for other ingredients contained in a product. It's particularly useful at quickly delivering nutrients to the skin & hair and evaporating into the air. It can also work as a base solvent for perfume oils and fragrance oils, as well as an anti-static agent. It's particularly useful as a hair conditioner because it provides a silky feel with out weighing the hair down with greasy residue. It can be found in a variety of cosmetic products such as facial moisturizer/lotion, foundation, shampoo/conditioner, body spray, sunscreen, anti-aging treatment, antiperspirant/deodorant, concealer, hair dye and eye cream.

Safety Measures/Side Effects:

While silicones such as cyclomethicone do not appear to have adverse effects on the human body, there are many concerns regarding the harmful effects it may have on the environment (i.e. marine life). For this reason, many countries like Canada have requested the silicone industry to provide more information and scientific data regarding its safety. It's also worth mentioning that silicones may trap sebum, dirt, and bacteria in a layer on top of skin, thus potentially provoking allergic flareups and breakouts. See TIA’s silicone safety article.

Recommended Products with Cyclomethicone:
Medik8 Firewall ($145 in the shop), Osmotics Micro Peel Skin Resurfacing System ($86); E'shee Clinical Esthetic Vitalizing C Serum ($119 in the shop); LATHER Daily Defense Facial Sunscreen ($24); Amarte Aqua Veil Hydrator ($65); Osmotics Inner Light Complexion Enhancer ($30)

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

See all our FIVE BEST recommendations including Five Best for sagging skin, Five Best with vitamin C and Five Best eye creams

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