Hidden Chemicals: Siloxane

The True Cost of Silky Smooth Hair

Siloxanes are silicone based compounds that are often used to cosmetics for the purposes of softening, smoothing and moistening.  They typically make hair products dry faster, and deodorants glide on smoothly. Silicone based compounds are often used in moisturizers and facial treatments.  


  • hair care products
  • deodorant & antiperspirant
  • body and face lotions


Cyclotetrasiloxane, cyclopentasiloxane.


Bioaccumulation: Environment Canada has concluded that cyclotetrasiloxane and  cyclopentasiloxane are toxic, persistent, and have the potential to bioaccumulate in aquatic organisms (1)(2).

Endocrine Disruptor:  The EU classifies cyclotetrasiloxane as an endocrine disruptor as studies show it interferes with hormone function (3) and may impair human fertility (4).

Tumours:  cyclopentasiloxane has been shown to cause uterine tumours

Read More: 

  1. BHA
  2. Coal Tar Dyes
  3. DEA
  4. Dibutyl Phthalate
  5. Formaldehyde
  6. Parabens
  7. Parfum
  8. PEG Compounds
  9. Petrolatum
  10. Siloxanes
  11. Sodium Laureth Sulfate
  12. Triclosan


  1. Environment Canada and Health Canada. _Screening Assessment for the Challenge.  Octamethylcyclotetrasiloxane (D4)_. November 2008. 
  2. Environment Canada and Health Canada. Screening Assessment for the Challenge: Decamethylcyclopentasiloxane (D5). November 2008. 
  3. DHI Water and Environment. Study on Enhancing the Endocrine Disrupter Priority List with a Focus on Low Production Volume Chemicals. Revised Report to DG Environment. Hersholm, Denmark: DHI, 2007. http://ec.europa.eu/environment/endocrine/documents/final_report_2007.pdf
  4. European Commission. Regulation (EC) 1272/2008 , Annex VI, Table 3.2. Sep 2009. 
  5. California. Office of Environmental Health Hazard Assessment. Cyloxanes. Materials for the December 4-5, 2008, Meeting of the California Environmental Contaminant Biomonitoring Program Scientific Guidance Panel.