There's a saying in the reptile world: "You're not feeding your reptile — you're feeding what your reptile ate." If a feeder insect is empty calories, your reptile gets empty calories. If a feeder is loaded with vitamins, calcium, and moisture, your reptile gets all of that too.
Most feeders sold in big stores are shipped from huge breeding facilities. They sit in shipping boxes for days with nothing to eat. By the time they get to your reptile, they're stressed, dehydrated, and basically empty shells. That's why so many keepers have to dust EVERY feeder with vitamin powder — they're trying to make up for what should already be in the bug.
Our Dubia roaches and superworms eat fresh produce every single day: carrots (high in beta carotene), sweet potato (vitamin A), collard greens, mustard greens, and dandelion greens (calcium), plus oats and dry grain mix for fiber. The hornworms eat a special hornworm chow that we keep going on a steady cycle.
We don't use "gut-load powder." Gut-load powder is a dry mix you can buy in a jar, and it's not bad — but real fresh produce is way better. Bugs eat more of it, hold more moisture, and pass more nutrients to your reptile. Powder is what you do when you can't get fresh food in front of the bugs every day. We're a few feet from the kitchen. We can.
This is also why we still recommend dusting feeders with calcium (that's what the Calcium Care Kit is for) — even the best gut-loaded bug doesn't have quite enough calcium for most growing reptiles. But the difference between a properly gut-loaded Dubia and a shipped-in dehydrated one is huge. Your reptile will look better, shed cleaner, and eat with more energy.