Cyclopentasiloxane? Sounds like a mouthful! Does it go by any other name? Yes! It is also referred to as decamethylcyclopentisiloxane. I bet you thought it’d be something simpler, eh? Never fear, it is also abbreviated to the humble “D5” thankfully. Cycloblaaaaaah–What is it? Cyclopentasiloxane is yet another version of silicone you can find floating around in skincare and haircare products and is part of the broader cyclomethicone category. Its main purposes are as an emollient, lubricant and a solvent. But what’s the main point of it being in skincare? Unfortunately, cyclopentasiloxane doesn’t have much benefit when it comes to the