My mum got some cocoa butter baby lotion from saisburys, the sainsburys own stuff.
She told me to use it on my stomach because I got stretchmarks from drastic weightloss.
It doesn't get rid ofthem completely but continuous use does soften them, making them lighter and less noticeable.
You can only get rid of stretchmarks when they are red/purple colour.
So when mine turned white, I was really impressed with how well cocoa butter worked.