Does Dimethicone Belong in Toxin-Free Makeup?

Are you searching for toxin-free makeup and skincare products? If so, you're not alone. In my experience as a consumer product researcher and product safety advisor, one ingredient that generates significant debate is dimethicone. There's a plethora of negative information surrounding it online, claiming it can lead to acne due to its occlusive properties or even suggest it may contribute to endocrine disruption, reproductive toxicity, or cancer. However, it is crucial to seek credible sources rather than relying on anecdotal evidence. In this article, I will share my thorough findings regarding dimethicone to help you make informed choices.

Understanding Dimethicone

Formally known as polydimethylsiloxane (PDMS), dimethicone is part of the linear silicone family. This is an important distinction to make as confusion often arises from equating it with cyclic silicones, such as cyclopentasiloxane or cyclotetrasiloxane, which have different safety profiles. Unlike linear silicones, cyclic ones have been linked to harmful health effects. You can find more information on the safety of cyclic silicones in my blog, "The Intriguing Story Of Cyclopentasiloxane."

Dimethicone can be easily identified by its unique CAS Registry numbers (65-9, 62-9, and 00-6). Notably, extensive research indicates that dimethicone is well-studied, with no adverse health information reported by U.S., European, or Canadian agencies.

Safety Assessments of Dimethicone

The Cosmetic Ingredient Review (CIR) Panel evaluated dimethicone's safety and reviewed data from over 100 independent studies, concluding that its use in cosmetics is safe. However, the Environmental Working Group (EWG) shows mixed ratings over time, citing concerns based on the Canadian Domestic Substance List (DSL). Importantly, being listed on the DSL does not equate to harmfulness; it signifies government awareness. The EWG also recognizes products containing dimethicone within their EWG Verified program, indicating that it is not universally harmful.

Is Dimethicone Harmful to Skin?

Research presented in the CIR report indicates that dimethicone, even in undiluted form, was not found to be an allergen. Additionally, studies involving human subjects revealed no skin reactions at concentrations of up to 5%. The American Society of Contact Dermatitis does not classify it as a core allergen. Another benefit includes its use in treating conditions like hand contact dermatitis.

Health Risks and Dimethicone

The Ullmann's Encyclopedia of Industrial Chemistry confirms that dimethicone's extensive research indicates no health effects, not even with substantial oral doses. It is also important to note that dimethicone has a high molecular weight and is not absorbed through the skin. No bans or restrictions exist for dimethicone from health authorities in Canada and Europe. Small particle inhalation might pose lung risks, so I advise against using it in spray products.

Dimethicone's Environmental Impact

Concerning environmental safety, Ullmann's Encyclopedia states that dimethicone is largely non-biodegradable yet does not pose harm to aquatic organisms. While it may persist in the environment, it gets removed through sewage. Polydimethylsiloxanes, including dimethicone, exhibit low bioaccumulation potential, further supporting their environmental safety.

Conclusion: Dimethicone in Toxin-Free Makeup

After extensive research, I conclude that dimethicone is not toxic when used topically in cosmetics. In fact, it can enhance the performance of makeup, making it easier to spread and providing a desirable finish. If you prefer to avoid dimethicone, consider your skin type and product concentrations, as results can vary. For those wishing to explore safer skincare options, I suggest visiting OSi Specialties for more information on polydimethylsiloxane, or find the right products for yourself using Polydimethylsiloxane in Cosmetics and Buy Liquid Silicone.