Cyclopentasiloxane, with a short name D5 is a common ingredient found in many cosmetic and skincare products. Lipsticks to makeup foundations, a large variety of products use this chemical.
Silicone is abundantly used in the skincare industry and Cyclopentasiloxane is also one of its variants. It has no color or odor, acts as an excellent lubricant and, evaporated quickly.
As a result this becomes a great applicator, it spreads the products evenly, forms a protective layer, and the remainder evaporates rather quickly. It is the reason why many cosmetic products have that waxy, smooth, and shiny feeling.
Now that you know what it is and it’s uses, let’s get to bottom line
Is it safe?
It depends, I will try to keep it as brief as possible.
If Cyclopentasiloxane is inhaled it is most definitely harmful, now the harm depends on the amount ingested. Generally, products available in the market have a very small amount.
As mentions earlier about how quickly it evaporates, the risk of inhalation is reduced further.
Is it safe for the environment-
It is a rather complex and deep topic because one may argue in terms of the amount manufactured or the amount of total production used in the cosmetic industry. But if you must, here are some links directories containing some relevant information.
To conclude one can say that Cyclopentasiloxane is a necessary component of a vast variety of skincare products, most hair care products too have it, from eyeliners to deodorants, escaping D5 is almost impossible. As a result of its wide use, the product is rigorously tested and in general, it can be said that this product is totally safe given it is used wisely.
You might find this article on Glycolic acid useful.
Some products containing D5 and their detailed review.