Loose-ish skin

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Wondering if anyone has found something that actually works to help firm up looser skin? I don't really believe in any of the creams etc, it all seems like snakeoil from what I've read lol.

I've been packing 30-40 extra pounds for close to 5 years now, and I am curious if there's anything I can do to help my skin firm/tighten a bit as I drop it.