I hate to be the bearer of unwelcome news but I think once the damage has been done no amount of lotions, potions or exercise will make any difference if you haven't got the kind of skin that snaps back. It's all about genetics and the elasticity of your skin, I've had 2 children and unfortunately have the tummy to prove it, although its unoticable with my clothes on so it doesn't bother me. I'm sure Dr Dukan describes in the book that any sagginess might improve in the 6 months after the initial weightloss but if there's no improvement then that's pretty much it for your skin. We just need to embrace our new slimmer bodies albeit with a little looser skin