The main ingredient is silicon dioxide from diatomaceous earth. Diatomaceous earth is a natural product which comes from the fossilized remains of tiny plankton. While it hurts insects, it's harmless to people and other mammals, so it's safe to use. Even if you have kids or dogs and cats, you can sprinkle Scram on your carpet without a worry. The manufacturers recommend it as a safe and easy to use product for settings like daycare centers and nursing homes--anywhere you want to remove (or avoid!) an infestation of bugs.
You can actually use Scram in a preventative way, too, if you want to treat an area before bugs have the chance to move in. Landlords love it as a safety precaution for keeping spaces bug-free. It's easy to apply as it's a powder that you can shake on as easily as talc or carpet deodorizer. It can kill ants, fleas, roaches, bed bugs, spiders, and other insects as well.
Basically, the manufacturers of Scram want to make this safe product widely available as a more health-conscious alternative to many of the dangerous pesticides on the market. It's a US-based company, located in Cincinnati. Learn more about Scram Crawling Insect Killer and how it works by visiting www.scrambugs.com.