Are giant mealworms treated with growth hormones? This is a question often asked, but rarely answered. People will say “yes, giant mealworms are treated with hormones”. But when asked for specifics, most don’t know for sure. We will clarify this question for you once and for all. Our goal is to educate and inform. We are not here to tell you whether you should use giant mealworms as feeder insects. You should make this decision yourself.