There are many species of Cockroaches, but the ones used as live food are completely harmless. They are a docile species, which do not spread disease. Becoming more common as a live food, they should be used in the same way as Crickets.

Feeder Cockroaches have a high protein to fat ratio, making them a huge source of protein for your reptile. You can also gut-load them - feeding them up full of nutrients for your reptile. This allows them to attain even more nutrients into their diet - becoming more beneficial to your reptiles needs.