Namely
Cyclopentasiloxane is a volatile silicone also called Silicone D5. It does not accumulate on the hair or skin and gives consumers the advantage of this family without its disadvantages: soft, non-greasy feel and lubricating properties.
However, it has been closely monitored for several years and its release into the wild remains a concern. D5 is classified vPvB (very persistent and very bioaccumulative). The risk for the environment arises from its presence in certain cosmetic products rinsed with: from January 31, 2020, the maximum content of D5 will be set at 0.1% in cosmetic products rinsed with water, which fact, prohibits its use, since in such concentrations it will no longer be of any interest. It is prohibited in organic.