This particular product, artnaturals Collagen Booster Serum is designed to boost and lift facial skin as well the skin on your neck and décolleté area. It has not yet been tested by us on belly skin or other body parts. The skin on our faces is not only much thinner but also a lot more sensitive than the skin on other parts of our bodies, which is one of the reasons that this collagen product absorbs so well and works wonders. However, feel free to give it a try on your stomach, you may be on to something.