Nope. Many people even breeders use it and swear by it. I've not heard one bad thing about it. Just add it to water and serve. It's a complete meal, no supplements needed. I personally plan to feed fruit baby food (I'm such a nerd, I went out and bought some yesterday and I don't even have the crestie let alone a setup ready) and fresh fruit. But I'm going to use the Crested Gecko Diet you're referring to as my supplement for each meal. Some meals I'm going to use the Gargoyle Gecko Diet because it has more protein for a growing crestie. I plan to feed crickets and silkworms about 1-2 times a week as well. But if I don't do the insects my crestie will still get healthy meals - let's just hope my crestie likes this plan!