Why Avoid Siloxanes for Fertility, Pregnancy and Postpartum


Why Avoid Siloxanes for Fertility, Pregnancy and Postpartum

'Addition Avoids’

From the No Addition Awareness Series

This article is part of a series of educational blog posts on chemicals to avoid for fertility, pregnancy, and their impacts on reproductive endocrine function.

Planning for a baby is such an exciting time in many women’s lives, but it is also a time to be mindful of toxin exposure during day-to-day life that could impact her baby. The 3–6-month period prior to intended conception is an especially critical time to avoid toxins. We are exposed to endocrine disrupting chemicals (EDC’s) so regularly that their cumulative impact can pose significant risks to mom and baby

Learning how to reduce the toxin load in everyday life takes time and is not an overnight process! If you are TTC (trying to conceive), pregnant, or conscious in avoiding chemicals that negatively impact your endocrine function, Addition Beauty is here to help guide you by highlighting chemicals to avoid for fertility and pregnancy in our latest series: “No Addition Awareness.” We’ll call out toxic chemicals (and where they are hiding!) that have made our “No Addition List,” a list of EDC’s and other toxins we’ve blacklisted from the ingredient lists in our products. Rest assured, Addition Beauty’s goal is to create safe makeup products so that you and other women can have peace of mind throughout womanhood!

Term to know:

EDC’s: These chemicals can affect fertility and pregnancy. They affect the reproductive endocrine system’s normal function by interfering with glands that produce estrogen, progesterone, and other reproductive hormones. This may not only affect the woman, but it may impact fetal development and the child’s hormone development as they grow up.

Today’s focus: Siloxanes. So, what are they?

Siloxanes (suh-laak-sayns) are derived from silicones and are used in many cosmetic products ranging from hair products to lipsticks, moisturizers, deodorants, foundations, sunscreens and more. Their main functions are to soften, moisturize, increase spread and make the skin and hair feel smoother.

Why avoid them?

Siloxanes can have negative effects on both our bodies and the environment. According to the European Chemicals Agency, D4 (a.k.a. cyclotetrasiloxane) is suspected to damage fertility and is toxic to aquatic life.

  • Reproductive toxicity: There have been studies on lab rats showing effects such as a reduction of implantation sites and increased post-implantation losses.2 D4 is a partial agonist, which means it enhances the effect of estrogen. Studies with D5 (a.k.a. cyclopentasiloxane) in lab rats show that there might be potential carcinogenic effects as demonstrated by uterine tumors in female rats.3

  • Environmental damage: D4 and D5 are unfriendly to the environment since they do not break down or dissolve when washed down the drains, resulting in increased toxicity to our water supply and to aquatic life. The bioaccumulation of these compounds in nature builds up in the bodies of aquatic life and is damaging to plant-life.

Where are siloxanes hiding?

Addition Beauty has included siloxanes on our “No Addition List” to guide our formulations. In particular, we refrain from using D4 and D5 chemicals. This less commonly known group of chemicals can sneak into all sorts of cosmetics, including makeup, soaps, lotions and more. Be sure to always read your product labels to watch out for the following ingredient names.

Common names for D4:

  • Cyclotetrasiloxane with 'octamethyl', 'decamethyl' or other variation in front of it

  • Cyclotrisiloxane with ‘hexanethyl’ or other variation in front of it

Common names for D5:

  • Cyclopentasiloxane with ‘decamethyl’ or other variation in front of it

Given the risk of cumulative exposure of siloxane ingredients in our cosmetics and other personal care products, we choose not to use them! Furthermore, Addition Beauty strives to reduce our carbon footprint on this Earth and the risk of damaging aquatic life. Stay tuned for our next chemical of focus in our Addition Awareness Series!