Hasn't made it worse for me. It's just preventing me from getting really bad ones. It's genetic in my family so of course I got some, but they're not all that bad. No deep purple ones, thank goodness!
I use Bio Oil and I love it. I got it from Wal Mart for 28.00.
I use cocoa butter all the time because I've had stretch marks from before I was pregnant and they have improved from what I've noticed
I've been using cocoa butter my whole pregnancy and I haven't gotten a single stretch mark and I'm growing like crazy!