In my experience, even once they fade, they will have a little bit of paler/shinier look to them once they set in, even with good maintenance practices, so keep expectations measured and realistic-anything claiming to vanish or chemically prevent them is going to be a scam. Moisturize, sunscreen, and work on losing weight in a safe and (somewhat) gradual fashion so your skin has time to settle as you lose more weight. Loose skin and stretch marks after weight loss are totally normal.