While it may seem slow to you, remember slow loss means less stretch marks, less saggy skin, and a better likelyhood of keeping it off.

There are things you can do to help, not only with preventing stretch marks, but getting rid of cellulite.
1. Keep hydrated, drink tons and tons of water. Maybe also put a mumidifier in the house if you live in a dry climate.
2. Exercise. It increases circulation and helps the most.
3. Moisturise. Massage lotion in each day. The lotion keeps skin soft and elastic, while the massaging helps keep circulation good.
4. Dry skin brushing. There are threads on it here, and info on the web about it. It can help increase circulation as well as exfoliate for softer skin.
5. Get your veggie sand suppliments in. Those vitamins have thier uses.