I purchased a small bottle of Bio Oil to use on my stretch marks and can honestly say that after two week of applying(twice daily) the stretch marks have smoothed out and are much more supple. I am also using Bio Oil on my face for about a month now and I have noticed a difference.
When you apply it, you need to make sure you are applying it in a circular motion. The bottle says twice a day but for my face I apply it at night only right after showering. The overall appearance redness, uneven skin tone etc has improved too.
I am very impressed with the Bio Oils work on stretch marks so I can highly recommend it.