I tried gutloading the other day with veggie scraps my mom gave me. It's called choy sum in Chinese and dubbed something like Flowering Chinese Cabbage at the store. (It's a dark green leafy vegetable with yellow flowering buds.) Well, you know how after you put some veggies in, and after the mealies are done eating it, you still find scraps and dried up pieces that never got eaten? Within hours, my mealies and superworms had devoured ALL of the choy sum. It was the first time I'd ever seen them do that with any veggie before, and I've fed them stuff like collard greens and baby bok choy. If you can find some of the really leafy Asian vegetables, they're supposed to be low on the oxalic acid. 
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chickabowwow

3.2 leopard geckos (Rosie, Locke, Lisa, Caesar, Tommy)
and 3 eggs a' cookin' 