Cyclopentasiloxane is a silicone. I learned recently that the real name of many of them actually end in "xane". For some reason it became "all the rage", to the point that some COs found at health food stores that didn't have it now do.

For more info or to post your questions, look up the "sticky" thread called "Ingredient questions" at the top of the Index.
2A/3A, medium length, layered, colored dark/medium ash blonde - "CGer" since April '02.

"Converting the 'curlskeptics' one curly head at a time..." HWHC