Cyclopentasiloxane and similar cyclic siloxanes showed minimal skin absorption and no signs of irritation or allergic reactions in testing. The researchers concluded these ingredients are safe at current cosmetic use levels, with negligible risk of systemic exposure from topical application.

The Cosmetic Ingredient Review Expert Panel conducted a safety assessment reviewing available toxicology and absorption data on five cyclic siloxane compounds used as conditioning agents in beauty products.

Funding not disclosed in abstract