Skip to content

Siloxanes in the news – Are they bad for you?

March 6, 2009

Toronto News ran an article on Wednesday warning consumers about the potential risks that siloxanes pose to both the consumer and the environment.  The report links these chemicals to a range of health problems such as cancer, allergies and more. So, what are these chemicals, where are they and what truth is there in this story?

Siloxanes – What they are.

Siloxanes are a group of chemicals that are based on silicon. Silicon is a naturally occuring chemical element that makes up around 26% of the earths crust.  This makes it the second most abundant chemical after oxygen! Silicon can be found in many minerals such as those found in clay, sand, mica, Opal, Amethyst and quartz.

Silicon metalloid is created from special silicon rich sands that are mined around the world (West Australia is one such place) . The sands are then used to make silicones which are a wide range of chemicals that use Si as the basic building blocks rather that carbon- C.

The siloxane that is being discussed in this article is cyclopentasiloxane. This is a ring structure silicone with 5 silicon’s in a ring. The structure makes this chemical volatile meaning that it quickly vaporises or dissapears when sprayed. The structure and the silicon construction also gives this chemical the power to empart “shine”.

So in short. Siloxane or Cyclopentasiloxane in this case is a chemical that will make your hair or skin shiny without weighing it down. Its ability to vaporise quickly is also good for products that you want to dry quickly.  A bit like when you put alcohol on the skin, it cools it down and leaves it feeling dry rather than greasy! It also improves the slip of creams making them easier and lighter to rub in.

So siloxanes are a type of silicone.  What else is silicone used for?

Silicone based chemicals are used in a wide variety of applications because they are generally chemically inert. That means that silicones do not tend to break down during application and they are not very reactive.  Because of silicones stability silicone chemistry is found in many consumer products. Personal Care and Cosmetic products are one area but silicones are also use in non-stick coatings, in bakewear and utensils, in baby colic drops, in burns dressings, breast implants, in some toys and as sealants. You may be interested to know that silicone chemistry is being used to replace PTHALATES in things such as baby bottles, sex toys and other products that come in contact with the body.

Silicone chemistry can take on many forms  with some being safer than others. Silicone is in the same chemical family as Carbon so you can get just as many types of silicone as you can of carbon based chemicals.  Carbon is the chemical that  makes up us, plants and other animals.  This means that it isn’t useful to lump all silicones in one group. Some silicones will be especially designed to be hard and stiff, others will be volatile liquids. Some will be modified so that they have a reactive group on them, others are completely unreactive. Some take a long time to biodegrade, others dissapear very quickly.  We are talking about Siloxanes so that is what we will discuss below.

So what is the history of Siloxanes in cosmetic products?

Siloxanes have been used to make hair sprays, mousses and gels dry more quickly for many years. The use of silicone’s in products has increased as the price of silicone based ingredients dropped due to increase in supply and the development of more and more ingredients to solve specific cosmetic problems.

Silicones are the ingredient behind many “oil free” make-up claims they also help to make a product feel “velvety” and help with the quick drying or gloss effect (high gloss lip sticks).

In the 1990’s women who had had silicone breast implants were found to have a higher than expected amount of a D4 siloxane in their breast tissue. A number of scienfic studies were carried out and a decision was made to move away from D4 siloxane in both breast implants and in the personal care industry.  You can read a story from the New York times here.

Following on from those health concerns the global cosmetic industry moved towards a safer and less volatile version of the siloxane – the D5 or cyclopentasiloxane that we use today.

While Cyclopentasiloxane is listed as safe – something that the material data sheet confirms, the material and other cyclomethicones are second from  top of the Cosmetic Industry Review panels priority list.  The CIR review the safety of cosmetic ingredients by looking at data from industry bodies, academic institutions and government departments.

What likely health risks are there with cyclopentasiloxane?

Cyclopentasiloxane was the subject of a review in the International Journal of Toxicology in 1991, Vol 10, No 1 pages 9-19. The study found this ingredient to only penetrate the skin to a small degree and to be generally harmless under normal use conditions.  In the environment cyclopentasiloxane can start to bioaccumulate in fish but the majority of the chemical released into the environment is broken down quickly due to the chemicals volatility.  Cyclopentasiloxane is often mixed with other silicones and has been cited in many patents for trans-dermal drug delivery. In this instance the silicone is often there as a vehicle to keep the drug close to the skin rather than as an ingredient that passes through the skin.

Cyclopentasiloxane is quite a large chemical and is definately not a nanoparticle (as one article stated!)

So What Should I do?

Well, the products containing the highest percentage of this chemical are for hair styling or for de-tangling.  Creams and lotions tend to contain very little of the cyclopentasiloxane. All of the reliable information that we have found so far point to this ingredient as being safe so really we would suggest that there is little need to be concered for your own health. However, if you are worried about the impact of cyclopentasiloxane in waterways then looking for rinse off products that don’t contain this ingredient may be an option. A rinse off product is something like a shampoo, conditioner or a body wash that you rinse off!

Ok, so we shouldn’t worry!

Science is always evolving and as more studies are done and more information gathered you never know what will be found. However, current evidence states that this ingredient is not about to kill anyone unless you A) slip over in a puddle of it (it is very slippy) or B) drink copious ammounts of the chemical.  It is your body so if you are concerned talk to a dermatologist, pharmacist or a doctor rather than “google” as in researching this piece we found lots more mis-information. You can also look at this other site: cosmetic

Will you keep me informed?

YES. As soon as we find out more information we will let you know. We source our information from academia, the medical profession, the cosmetic industry, independent scientific researchers and non government organisations.  We are always looking to improve on our information in order to give you a balanced view.

To read the article that stated siloxanes are bad click here  City News article on Siloxanes.

To stay informed join Realize Beauty now by clicking here: JOIN NOW

32 Comments leave one →
  1. November 1, 2010 2:41 pm

    Thanks for this informative article filled with great facts! I appreciate your time in research. I was just wondering if you knew that the site you noted “cosmetic” is funded by the cosmetic industry and all the info there is provided by them.
    It seems like a conflict in interest to me…unless you have other info about the site that I don’t know.

    • RealizeBeautyEd permalink
      November 2, 2010 10:33 am

      Hi there,
      Yes I do know that the cosmetics org is from the cosmetics industry which I know will make some people think that it is by default evil. It is up to the reader to decide if they trust the info or not. The other site that gets lots of attention is the environmental working group and their campaign for safe cosmetics. If you look at who is behind and supporting this you will also find cosmetics manufacturers, political activists and a wide range of other people. There is nothing wrong with having an agenda but that shouldn’t get in the way of facts.

      • heather permalink
        January 12, 2012 11:40 am

        Hi! I was fascinated by a velvety face cream that enticed me but the penta-siloxane and a vinyldimethacone were the main ingredients. There is almond oil, jojoba, aloe and other nice things but they were lesser in volume. I think this slippery molecule is just there to impress with its softness. It sounds like it doesn’t have an actual useful feature like hydration. Why buy any cream where this is the main event and not a small ingredient? I’m thinking it’s all for show – would you agree? What an expensive cream it was too!!

      • RealizeBeautyEd permalink
        January 14, 2012 5:25 pm

        Well that is not strictly true as silicones can provide moisturisation, film-forming (to either help protect the skin from harsh, dry environments or to help encourage active ingredients to penetrate into the skin), gloss and improve spreadability too. Feeling good is very important for a skin cream though so it shouldn’t be overlooked as nobody wants to feel like they have a sticky mess on their face all day. Also I wouldn’t just discount a product because the ‘nice’ sounding ingredients are low down the list. You only need 0.1% of hyaluronic acid in a product to get an effect and the same goes for some other actives. In addition much more than 1% of many herbs and essential oils can be irritating.

  2. February 8, 2012 10:45 am

    Products containing this silicone cause me to have a poison ivy like rash. I was treated for several months by a dermatologist before I realized what was causing it. Recently I bought another product with it in it and had the same result. I loved the way it made my hair and skin feel and recommended it to everyone. It did not cause any problems for several months, thus I did not suspect it of causing my rash. This was a bad rash that itched very bad and the more you scratchecd the more it itched. The only thing that would make it stop was very hot water.

    • RealizeBeautyEd permalink
      February 13, 2012 2:51 pm

      That sounds just awful! I can relate to the hot water thing as I find that helps with my dermatitis sometimes. Hope you are feeling better now and don’t have too much trouble avoiding these ingredients.

  3. Ben permalink
    July 15, 2012 2:39 pm

    Hi I just bought some sex lube that has this stuff in it to should I be worried about it?? Please reply thanks Ben

    • RealizeBeautyEd permalink
      August 4, 2012 9:17 am

      Well lucky you! As sex lube is going in delicate places and may even be eaten (I know, how bizaaaaar) the safety regs for its manufacture and ingredients are much tighter than for regular cosmetic products. You should still do a patch test when changing lubes – do it on yourself BEFORE you use it as friction would add to any reaction that you could get. If that turns out OK go ahead and use it. The big brands are not ‘natural’ but are highly effective and have a low irritancy potential. Not all ingredients are good down there and some may degrade condoms so I wouldn’t deviate from off-the-shelf products if I were you. Good luck with it all.

      • Ben B permalink
        August 6, 2012 2:14 pm

        Hi thanks for the reply I have been using the silicone lube for like 6 months and no problems and it is condom compatible!!! I was using it with my now EX and now single. Break up with GF was not about lube or sex!! I also buy my stuff from my local sex shop that I trust that knows a ton about anything and tells you how to use things!!! It is really sad that I bought all this lube and 50+ condoms and had no luck finding a girl to use them with before september of 2012 since they expire then!! If you have any ideas where I can find someone that does not cost anything that I can use them with by then please let me know?? But the lube is good till like 2020 so I’m safe with the lube till then!! But one of the one things I don’t like is the plastic the bottle is made of!! so thanks for your reply and info I deffinetly like this site!! Thanks for the info and peace Ben please reply

  4. November 18, 2012 2:59 am

    Great informative article that I can pass along to clients who wonder why I use a small amount of non-natural preservatives.

  5. October 15, 2013 11:34 pm

    I am just curious, mind you – to be honest I haven’t even purchased this item, as yet, but I would like to know if I should tread carefully in a case where cyclopentasiloxane is the 1st ingredient listed in a facial product?

  6. October 15, 2013 11:35 pm

    I would also like to add that this is a great and very informative article

    • RealizeBeautyEd permalink
      October 16, 2013 1:25 pm

      Thanks for the feedback. Should you tread carefully when cyclopentasiloxane is the first ingredient? It depends. It may be the first ingredient but still be within safe levels so I guess that depends on what the product is, how it is to be used and how often it will be applied. It would also help to know how much was in that particular product but without the formula it is sometimes difficult to judge that. So, my advice would be to work out if you feel that the company has performed safety checks on the particular product as a first port of call. If you feel happy with that then using the product as directed should suffice.

  7. glittergirl permalink
    December 23, 2013 1:13 pm

    oh crap now I need to check the ingredients list in all the Bobbi brown stuff I use.


  1. 118
  2. 135
  3. 126
  4. 129
  5. 119
  6. 111
  7. 121
  8. 119
  9. 120
  10. 130
  11. 114
  12. 128
  13. 141
  14. Neutrogena Clinical: Facial Lifting Wrinkle Treatment Kits — Anti-Aging Taken to a New Level. Does It Work? |
  15. Product Review: Beautiful Textures Flat Iron Silkener | Its Just Jessica
  16. Beauty Script | Trend Report: Limecrime Velvetines – Terrific or Toxic?
  17. Organic Skin Care for Clearer Skin – Fitness, Diet & Healthy Lifestyle Blog
  18. 10 Ingredients in Your Makeup that Can Kill You – Ask Ashley – That's Me.

Leave a Reply

Fill in your details below or click an icon to log in: Logo

You are commenting using your account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s

This site uses Akismet to reduce spam. Learn how your comment data is processed.

%d bloggers like this: