I have been getting so many mixed messages regarding silicones lately.
Belinda Carli from the Institute of Personal Care Science says they are degraded and safe.
A search in Pubmed says that dimethicone and cyclotetrasiloxane are degraded in the environment and are ok, but the study was paid for by Dow Corning .
On the other hand, Credo Beauty says the opposite; silicones are on the dirty list. EWG has confusing information which seems to be in line with Credo. What is Credo's motive?
Out of exasperation, I did a Google Scholar search and I found this article
It says; silicones, polymers and quats are poorly biodegradable. Thanks to wastewater treatment, clay catalized- hydrolysis and photo-mineralization, they are either processed or removed. They are not persistent, and are monitored.
Please share if you have any additional information.