May effect pa ba talaga ang mga anti-stretchmark creams?

According to commercial of Rose Hip, if I remember it right ha, you have to apply it early on pa, hindi ung kung kelan na kumalat ung stretch marks, dun pa lang mglalagay. Parang prevention sya para magka marks un skin in case mastretch due to pregnancy. But for most, it helps lighten pero meron pa din bakas.