I'm always cautious of products, and I personally don't know if this works, but I've seen results on other people, and it seems like it does what it says, so it may be worth looking into.
https://www.amazon.com/dp/B01M2UIQ42/ref=cm_sw_r_cp_apa_fabc_6Xv2FbWVBQ8AZ?_encoding=UTF8&psc=1
It's something I will probably buy at some point when I start to have loose skin show; however, I can't personally attest to it, its just something to look into.
(Also if anyone knows for certain if this works/doesn't work, I would love to know!)