Bennayboi is correct. Repashy DOES however have a decent Leopard Gecko dust called Calcium Plus I believe - an all in one calcium and vitamin supplement to dust feeders with prior to dinner time I've had good experience with it. But as you asked about a "diet", no, leos benefit from LIVE prey. Most of my geckos will not eat something unless they see it wiggle or crawl first!
thanks guys, thats what i figured, i searched a bit more after my post. Leo is only interested in the wigglers, not the mealworm type, only my gut loaded supers.
crested geckos will eat baby food and canned fruit mash like that as well as crickets, mealies, ect. While on the other hand it is very rarely a leo will eat anything not moving as mentioned in the above posts.