Skin Care Review: StriVectin SD

StriVectin SD is purported to diminish stretch marks but recently had gained favor in the press as helpful to diminish wrinkles and fine lines on the face/neck. I'm in my early 40's, fair/ruddy-complected with normal skin & only slight sun damage. Faithfully applied this product for 40 days, 3 times/day as required. The only effect I witnessed was a propensity to develop more pimples. Furthermore, this product isn't cheap ($99/bottle). Perhaps I didn't use it long enough but I would have expected some positive if even slight improvement over the course of 5-6 weeks, yet I did not.