My sister hates this product. Apparently, it does increase collagen production and a lot of women have reported that they saw a reduction in their wrinkles. But it's just not for anyone.
My sister used it for two years and all it did was giver her acne breakouts. I don't know if she was allergic to it or if one of the other ingredients in the cream was irritating her skin, but it didn't work for her at all. She used to have clear and acne-free skin before, just a lot of wrinkles. But when she was using tretinoin, she would get pimples, blackheads and clogged pores.
It was not fun for her and even though she kept using it with the hope that it would get better, it just didn't. I personally think that tretinoin is not a bad product. I have never tried it but I have several friends who speak very highly of it. Everyone's skin is different though so it might help some people but not others. You won't really know unless you try I guess.