I think it's vitamin A in moderation Kye? Not 100% on that one though.

Bio Oil might be worth a shot, smells nice at least. I used it with my first and no stretchies, I haven't used it this time, just moisturiser, and I'm starting to get them...there are a lot of variables there though, not least that this is my second bub in a short space of time! Still, many people swear by it.