Crickets are commonly used as a standard feeder for most insectivorous pets. With a wide range of sizes and cheap production costs, crickets have become a popular staple.
Unfortunately, freshly shipped crickets are usually not nutritionally complete. To improve this you need to feed the insects high quality foods prior to feeding the insects to your pet. This process is called gut loading and it should take place 24 to 48 hours prior to feeding the insects to your pet.
Gut loaded insects should still be dusted with calcium and vitamins before feeding to your reptile.