Stretch mark cream

Anna
So I've been noticing more stretch marks so I did some research to find the best one! I found one that is very popular called "mederma". So I looked online to see how much it is... $48, than I looked on Amazon found one for $28, THAN I found the same one on Amazon except a foreign version for $19.99 so I bought it! Has anyone else used Mederma? They all had great reviews online!