Another point (the most important) is that cyclic polysiloxanes, especially cyclopentasiloxane (D5) and cyclotetrasiloxane (D4, less used in the cosmetics industry, mainly introduced as impurities), may have an impact on the production of breast milk, thereby affecting some health problems in babies, and there is no specific evidence of its harm. At present, the Canadian government has listed cyclopentamelic siloxane as one of the toxic chemical components, requiring cosmetic companies that use this ingredient to declare safety and dosage for better supervision.
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Octamethylcy clotetrasiloxane IOTA D4 - IOTA CORPORATION LTD. (iotachem.com) 
