Should You Feed Superworms? An Honest Keeper's Guide
- Role
- Treat only
- Protein
- ~18%
- Fat
- ~15%
- Moisture
- ~60%
- Chitin
- moderate
- Ca:P
- 1:14
- Calcium-rich
- No (dust it)
- Best for
- Treat / weight-gain for adult animals
I've fed superworms for years, and they're one of the most misunderstood feeders in the hobby. Marketing copy loves to call them a "nutritional powerhouse," but the honest truth is more useful: superworms are a fantastic supplemental feeder and a terrible staple. Knowing the difference is what keeps your animal lean and healthy. Here's how I actually use them.
What a superworm is
A superworm is the larva of the darkling beetle Zophobas morio — a bigger, longer-lived cousin of the mealworm. Mature larvae reach about 1.5 to 2 inches, with a soft-ish segmented body and a firm head capsule. They stay in the larval stage for months as long as they're kept together in a bin, which is exactly why they're so convenient: they don't pupate on you the way mealworms do, and they survive for weeks with almost no care.
That convenience is the real selling point. The "exceptional nutrition" angle is where most write-ups overstate things.
The nutrition reality (read this before you make them a staple)
Superworms are protein-rich and energy-dense, but that energy comes mostly from fat. Typical analyses put superworms around 17-20% protein and 15-18% fat on a fresh-weight basis. That fat number is the catch. Reptiles prone to obesity and fatty liver disease — bearded dragons, leopard geckos, most monitors — do not need a high-fat feeder in heavy rotation.
Like nearly every feeder insect, superworms are also phosphorus-heavy with poor calcium. Their calcium-to-phosphorus ratio is inverted (well under the 1:1 to 2:1 you want), so you must dust them with a calcium supplement before feeding. Do not believe any claim that superworms have a "favorable" calcium ratio on their own — they don't. Almost no feeder insect does.
| Feeder | Protein | Fat | Best role |
|---|---|---|---|
| Superworms | ~18% | ~17% | Supplement / treat |
| Discoid roaches | ~20% | ~7% | Daily staple |
| Hornworms | ~9% | ~3% | Hydration treat |
| Silkworms | ~9% | ~1% | Premium supplement |
Put plainly: a discoid roach gives you similar protein at less than half the fat. That's why I build a rotation on roaches and rotate superworms in for variety, not the other way around.
When superworms genuinely shine
There are real situations where I reach for them on purpose:
- Putting weight on a thin or recovering animal. The fat that's a liability for a chubby beardie is an asset for one that's underweight after illness, brumation, or a move.
- Picky eaters. Superworms wriggle vigorously and trigger a strong feeding response. They've broken many a hunger strike for me when a calmer feeder got ignored.
- Large lizards as part of a varied diet. Monitors and tegus can take superworms as one item among many — roaches, hornworms, eggs — without the fat dominating their intake.
- Enrichment. That active movement makes the animal hunt, which is good for body and mind.
Sizing and feeding
Match the feeder to the animal. The standard rule is that a prey item should be no longer than the width between your reptile's eyes to avoid impaction or choking. Small superworms (1-1.5 in) work for sub-adult lizards; medium to large (1.5-2 in) suit adult bearded dragons, large skinks, and monitors.
Two safety notes I always pass along:
- Dust with calcium (plain calcium powder, or calcium with D3 on the schedule your species needs) right before feeding.
- Mind the mandibles. A large, healthy adult will crunch a superworm instantly and there's nothing to worry about. But don't drop a big superworm in with a small, slow, or recovering animal and walk away — feed it by tong instead.
Storing superworms so they last
This is where superworms beat almost everything. Keep them at room temperature, 70-80 F, in a ventilated container with an inch or two of dry wheat bran or oats as bedding (which doubles as their food). Add a slice of carrot, potato, or a leafy green for moisture, and pull it out before it molds. That's it — no water dish, no misting.
The one rule people get wrong: never refrigerate superworms. Mealworms tolerate the fridge to slow their metabolism; superworms do not. Cold makes them sluggish and then kills them. If you want to slow their growth, a cool room (around 60-65 F) is as far as you should go. Keep them spread out, too — crowded, hungry superworms will cannibalize, which is your investment eating itself.
How they fit a healthy rotation
My honest recommendation: make a low-fat feeder like discoid roaches your daily protein base, and rotate superworms in once or twice a week for variety, enrichment, and the occasional weight boost. Keep hydration feeders like hornworms in the mix, and dust according to your animal's calcium schedule. Variety is the whole game — no single insect is a complete diet, and superworms are no exception.
Used that way, superworms are genuinely great. Used as a daily staple, they're a fast track to an overweight reptile. The bug didn't change; the role did.
For the bigger picture, see why superworms are popular feeders for reptiles and the complete guide to calcium and supplementation.