Some people have success just using olive oil. Avocado oil is actually very good for preventing & healing scars.

I don't like Bio oil coz of the mineral oil in it. I used a natural belly balm.. still got a few stretchmarks, but they seemed to fade quite quickly. I think the general understanding is that if you're gonna get them, you're gonna get them. But if you nourish your skin, I think it could only do it good, and perhaps help it heal faster