Weight loss and loose skin ?

How old are you? If you're young and you have good genetics on skin there's a chance it will shrink, not all but a portion of it. Good hydration, collagen supplements, Vitamin E etc might help a little but honestly there's not much to do.

I've been yoyoing my bodyweight up n down for years, currently i've lost 45kg and the excess skin is A LOT. It's mostly on low abs and chest but overall i can see it and feel it in my thighs, back, everywhere.
 
Weight cycling is the worst for skin elasticity.

There will be some snapback, but after one year, don't expect further improvement.

I found my skin elasticity improved significantly while on a high dose 6 month course of isotretinoin. Unsurprising as low doses are used for that purpose, to lessen wrinkles, and produce measurable improvements in collagen.

Large areas of sagging skin can only be dealt with by surgery.

Pro Tip:

Insurance will not cover cosmetic procedures. However, for many plans, if your doctor can document a 50lb or greater loss, and you complain that the loose skin painfully irritates you (by rubbing, getting caught on clothes, etc) or is difficult to keep clean, that's a functional problem and they will cover skin reduction. surgery.
 
Maybe if your young and this is the only time you've gained and lost weight you'll have some tighten up. There's all kinds of stuff to waste your money on. In my skin, literally, it just didn't tighten up. I am older and lost more weight than you so maybe there's hope.
 
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