have you tried switching brands? the 1st calcium powder i bought was T-Rec Calcium No Phosphorus with D3, because it was cheap and had other vitamins in it. opened it, smelled it (gross), and was sure he wouldn't eat anything that had touched it. he did tho, and takes to the reptivite too. then again, little man is a toad, but when he 1st moved in, he WAS picky. it was annoying cuz i'd spent gobs of money on silkworms and phoenix worms and he ate 1 silkworm out of the hundred, ignored the rest, and 2 phoenix worms. he'd get scared and pee when placed with phoenix worms. (that should have been a clue for me.) so i went out and bought crickets cuz it was getting too cold for bug catching outside. he loved them, but i didn't, so i bought dubia and he loves those too (breeding them). went back to phoenix worms and he decided he liked them a lot, but was pooping them out whole, and sometimes still alive. it was awful.
i also bought mealworms and feed him the newly molted ones. today i found 2 little shrimp-like things in mealworm cup, didn't know what it was, and put them in his dish with the others. then i looked it up and saw it was a pupa so i went back to retrieve them and he'd already eaten one. they don't move, but one was probably snuggling it and he snapped them both up. i just hope he doesn't poop out a beetle. i'm considering trying to breed them rather than taking them in and out of refrigerator.
i'm sorry Canada doesn't allow dubia. once i started feeding with them, that's when he did most of his growing. just a little guy in Sept, now almost full grown. cannot wait for my roaches to give birth, hoping it happens next week but it could be another 2 weeks cuz they're new adults. i know at least 2 are preggo tho. i'd send you some, but don't know what customs is like, and i couldn't put a "live insects handle with care" sticker one it. altho that sticker is mostly ignored. :/