im not too sure if u can over do it or not but they just say do it every other feeding for juvy frogs and once a week for adult frogs....but me personally i have never dusted any foods for my pixies before, and i have owned 5 by this point, but they all turned out fine...all of them were just feed heavily and with a good source of food...but for pacman frogs its different....i had to find out the hard way with my apricot pac....he got the bone diease in his right leg pretty bad from lack of calcium