A good product for loose skin

Hi, first of all I'm sorry for my poor english. I'll do my best to be comprehensible.

I'm 49 years old, I'm in premenopause and I discovered to be diabetic 5 months ago.
I gained more than 50kg in one year and since I realized why 
I started to lose weight (I already eat healthy and I play sports) could you recommend a good product to help the skin of the body to firm up?

Thank you!