Anyone know of any stretch mark creams that WORK during pregnancy? :)?

I tried Palmers Cocoa er stretch mark cream too and it didnt work for me either...well maybe because that wasn't because I didnt used it everyday and as often as I needed to. I probably jsut used it a few times a week...but I didn't get stretch marks untill around 6 months either. I've heard bio oil works on stretch marks during pregnancy but Im not sure about after but I've heard the best has been revitol which is kinda pricey but I think they have a 60 money back gaurantee or something like that...I'm thinking about trying it out. I think you have to order online at their website though I'm not sure if any stores carry it. www.revitol.com