Updated November 2026 · By the Dragon's Diet Team · Health information checked against the veterinary and research sources listed at the end of this article.
Short answer: Neither superworms nor mealworms should be your reptile's main feeder. Superworms are bigger, livelier and fattier (about 18% fat vs 13%), so they're a good occasional treat for adult and older juvenile bearded dragons. Mealworms are smaller and a bit leaner. Both are low in calcium and need dusting. For an everyday staple, choose gut-loaded live insects like Dubia roaches.
Superworms and mealworms look like the same bug in two sizes, and they're related: both are darkling beetle larvae. But they're different species with different sizes, fat levels and handling needs. Here's how they compare, which one is safer for your reptile, and how to feed either one well.
Superworms vs mealworms at a glance
| Superworms | Mealworms | |
|---|---|---|
| Species | Zophobas morio larvae | Tenebrio molitor larvae |
| Size | Large, thick-bodied larvae | Smaller, slimmer larvae |
| Moisture | 57.9% | 61.9% |
| Protein | 19.7% | 18.7% |
| Fat | 17.7% | 13.4% |
| Calcium : phosphorus | About 1 : 13 | About 1 : 17 |
| Behavior | Active, wriggly, can nip | Slower, easy to catch |
| Storage | Room temperature (70–80°F); never refrigerate | Often kept cool in the fridge to slow growth |
| Best role | Occasional treat for adults | Occasional treat or variety feeder |
Nutrient figures are as-fed values from insect nutritionist Mark Finke's published analysis of commercially raised feeders. Calcium:phosphorus ratios are calculated from his calcium and phosphorus figures.
Nutrition: what the numbers mean
Fat is the biggest difference
Superworms carry about 17.7% fat, compared with 13.4% for mealworms. That's why reptiles love them, and why they're best kept as a treat. VCA Animal Hospitals says waxworms and superworms should be given sparingly and not offered daily because they're high in fat and can cause obesity. The extra fat can help a thin adult regain condition, but only with your vet's guidance.
Both are low in calcium
Bearded dragons need more calcium than phosphorus, and both worms have it the other way around. Superworms run about 1 part calcium to 13 parts phosphorus, and mealworms are closer to 1:17. That's normal for insects, and it's why VCA recommends calcium-dusted insects. Lightly dust every feeding and follow our calcium and vitamin D3 guide.
Protein and moisture are similar
Protein is close (19.7% vs 18.7%), and both are a little over half water. Neither worm offers a big nutrition edge on these measures, so choose based on size, fat and how your reptile handles them.
Which is safer?
Short answer: For an adult bearded dragon, both are safe when they're sized right, dusted and fed under supervision. Mealworms are the easier, lower-fat option. Superworms are the more exciting treat, but they're too big and too feisty for babies, and they can nip, so feed them with tweezers or in a smooth-sided dish.
Match the size to your reptile
A common rule is that a feeder should be no bigger than the space between your reptile's eyes. Superworms are big, so we don't recommend them for baby bearded dragons; save them for older juveniles that hunt confidently and for adults. Our superworms for bearded dragons guide covers ages and amounts in detail.
Superworms can nip
Superworms have small jaws and wriggle hard when grabbed. A bite won't seriously hurt a healthy adult reptile, but it's one more reason to supervise. The old story that superworms can chew their way out of a lizard's stomach is a myth; stomach acid takes care of that.
What about impaction?
You'll often read that superworm or mealworm "shells" cause impaction. Mark Finke notes that most insects contain relatively little chitin and that "too much shell" claims have little basis for reptiles eating appropriately sized insects. The bigger impaction risks are usually prey that's too large, a basking spot that's too cool to digest, dehydration, and swallowing loose substrate while chasing food. Our bearded dragon impaction guide lists the warning signs, like no poop, straining, or back-leg weakness. Call a reptile vet if you see them.
Don't let worms roam
Both worms burrow. If they get loose in substrate they can hide, and your reptile may swallow substrate trying to catch them. Serve them in a smooth-sided dish or one at a time with feeding tweezers.
How often to feed superworms and mealworms
| Reptile | Superworms | Mealworms |
|---|---|---|
| Baby bearded dragon | Not recommended | Not a staple; choose small, soft, gut-loaded feeders |
| Older juvenile bearded dragon | Occasional treat, only if it hunts confidently | Occasional, sized right and dusted |
| Adult bearded dragon | 2–3 worms once or twice a week | Occasional variety alongside a mostly-greens diet |
| Adult leopard gecko | Once a week or every couple of weeks, 2–3 at a time | Variety feeder, sized right and dusted |
Superworm amounts come from our superworms for bearded dragons and can leopard geckos eat superworms? guides. Every reptile is different, so ask your vet if yours is young, overweight, underweight or unwell.
How to feed either worm safely
- Gut-load first. Feed the worms fresh vegetables like carrot or sweet potato before feeding day. VCA says insects should be gut-loaded within 12 hours of feeding them to a bearded dragon.
- Dust with calcium. A light coat of calcium powder, every feeding.
- Serve in a smooth-sided dish or with tweezers. Our bamboo Keeper's Feeder Tweezers give you control and keep fingers out of the way.
- Feed a few, then stop. Count them out so treats stay treats.
- Supervise and clear leftovers. Don't leave live worms in the enclosure overnight.
How to store superworms vs mealworms
- Superworms: they're tropical insects, so keep them at room temperature, about 70–80°F. Don't refrigerate them.
- Mealworms: they're commonly kept dry in the refrigerator, around 45–50°F, where they go dormant and keep for a long time. Take out any vegetables while they're chilled, and let them warm up and eat before feeding day.
- Both: use a ventilated, smooth-sided container with bedding. Give superworms (and mealworms when they're out of the fridge) slices of carrot or potato for moisture. A clear Critter Keeper with a secure lid makes it easy to check on them.
The better everyday staple
Worms are great for variety, but most bearded dragons do best on a staple insect that's lower in fat, easy to gut-load and simple to keep. That's why many keepers build their feeding plan around live Dubia roaches and use superworms as the reward.
Our Dubia roaches are gut-loaded before they ship, so they arrive ready to feed. They come in Small (3/8"), Medium (1/2") and Large (3/4"), so you can match the size with our Dubia roach size chart. Every order ships USPS Priority with a 100% live arrival guarantee when you follow our live arrival policy: send a photo within 3 hours of delivery and we'll make it right.
Want a treat for an adult dragon? Our live superworms come in packs of 25, 50, 100 or 250. New customers can use code NEWCUSTOMER on their first order.
Superworms vs Mealworms FAQ
Are superworms or mealworms better for bearded dragons?
Neither should be the staple. Superworms are bigger and fattier (about 17.7% fat vs 13.4% in mealworms), so they suit adult dragons as an occasional treat. Mealworms are smaller and leaner but just as low in calcium. Dust either one with calcium and build the everyday diet around greens and a gut-loaded staple insect.
Can baby bearded dragons eat superworms or mealworms?
We don't recommend superworms for baby bearded dragons; they're large, active and high in fat. Mealworms aren't a good staple for babies either. Young dragons do best on small, gut-loaded, appropriately sized insects fed in a dish or with tweezers, with a feeder no bigger than the space between their eyes.
Can I refrigerate superworms like mealworms?
No. Mealworms are often kept in the fridge around 45–50°F so they go dormant, but superworms are tropical insects that need warmth. Keep superworms at room temperature, about 70–80°F, in a ventilated, smooth-sided container with bedding and slices of carrot or potato for moisture.
Do superworms bite reptiles?
They can nip, especially when grabbed, but a bite isn't likely to seriously hurt a healthy adult reptile. Feed superworms one at a time with feeding tweezers or in a smooth-sided dish, supervise every feeding, and remove any worms that aren't eaten. The idea that they can chew out of a lizard's stomach is a myth.
How many superworms can a bearded dragon eat?
For a healthy adult bearded dragon, two or three superworms once or twice a week is plenty. They're high in fat, and VCA Animal Hospitals says superworms should be fed sparingly, not daily. Dust them with calcium first, and ask your vet before using them to help an underweight dragon gain condition.
Does Dragon's Diet sell mealworms?
No, we don't sell mealworms. We raise and ship live superworms as a treat feeder and gut-loaded Dubia roaches as an everyday staple. Browse our Dubia roaches for sale in Small, Medium and Large to match your reptile's size.
Sources
- VCA Animal Hospitals, "Feeding Bearded Dragons"
- Mark Finke, "Nutritional Value of Commercially Raised Insects" (Gecko Time), summarizing Finke MD, "Complete nutrient composition of commercially raised invertebrates used as food for insectivores," Zoo Biology, 2002
- Rainbow Mealworms, "Care Sheets" (mealworm storage temperatures)
- Timberline, "Superworms" (superworm storage temperatures)
This guide is general husbandry information, not veterinary advice. Ask a reptile veterinarian about your pet's diet, especially for a young, new, or unwell reptile.
About the author
Written by the Dragon's Diet Team. We've kept and cared for reptiles for 25 years, and we raise and ship live feeder insects from Taylor Mill, Kentucky. Our care guides draw on that hands-on experience and on veterinary sources like VCA Animal Hospitals and the RSPCA.
