Bio Oil didn't really work on my Stretch marks. I used it throught pregnancy and continue to, but I have norice some improvement with my C-Section scar which is now alot flatter. It supposedly works on wrinkles and I have tried it on my face but broke out in spots. I use it daily on my body, sometimes mixing it with Palmers Cocoa Butter.
Incidentally where does everyone buy their Bio Oil? I get mine from either Chemist direct or Cheap Smells, 2 large bottles for around £20.