Are Silkworms Good for Leopard Geckos? Yes — Here's Why
- Role
- Rotation supplement
- Protein
- ~11%
- Fat
- ~2%
- Moisture
- ~80%
- Chitin
- very low
- Ca:P
- ~1:2
- Calcium-rich
- No (dust it)
- Best for
- Soft-bodied protein for picky or recovering animals
People ask me this one a lot, and the answer is an easy yes: silkworms are one of the best supplemental feeders you can give a leopard gecko. They directly address the three biggest nutritional risks a captive leo faces — obesity, impaction, and dehydration — and they do it while being one of the most reliably eaten feeders I keep. Here's the full case.
Why silkworms are nearly perfect for leos
| Benefit | The detail |
|---|---|
| Prevents tail obesity | ~1% fat — about 13x leaner than mealworms, 7x leaner than roaches |
| Zero impaction risk | No chitin, unlike mealworms with their tough shell |
| Hydration support | ~83% moisture — and leos often won't drink from a dish |
| Breaks mealworm fixation | Unique pale look and slow movement trigger interest in picky eaters |
| Serrapeptase enzyme | May support digestive and immune health |
The standout is fat. Leopard geckos store fat in their tails, and the most common diet problem I see is a leo on too many fatty feeders with a tail ballooning wider than its head. Silkworms at ~1% fat let you keep your gecko eating eagerly without adding the calories that cause that. The high moisture is a quiet bonus too — a lot of leos are chronically a little under-hydrated because they ignore their water dish, and a silkworm delivers water inside the meal.
The mealworm fixation fix
This deserves its own section because it's such a common, frustrating trap. Leos raised exclusively on mealworms often develop "mealworm fixation" — they flat-out refuse anything else. That's a real problem, because a mealworm-only diet runs ~13% fat (driving obesity) and has a calcium-to-phosphorus ratio around 0.04:1 (the worst of any feeder, pushing toward metabolic bone disease).
Silkworms are one of the most effective tools I know for breaking that fixation. Their pale color and distinctive slow wriggle are different enough from a mealworm to read as "new prey" to a stubborn gecko, and that novelty often gets a fixated leo to strike when nothing else will. Once they're eating silkworms, you've got a foothold to reintroduce roaches and other healthier feeders.
How to feed silkworms to a leopard gecko
Offer three to five small-to-medium silkworms per feeding, two to three times a week, dusted with calcium plus D3. They're a supplement, not the whole diet, so build the rest of the rotation around a real protein staple — discoid roach nymphs — plus BSFL for calcium. And keep a small dish of plain calcium powder in the enclosure; many leos voluntarily lick it for an extra top-up.
If you want to add the leanest, safest supplement to your gecko's diet, low-fat silkworms sized small to medium are exactly what to reach for. They're soft enough for any age, impossible to bite back, and about as close to a no-downside feeder as exists.
For the full rotation, see my complete leopard gecko diet guide, and for exact amounts across species, how many silkworms to feed your reptile.
Sources: Finke, M.D. (2013). "Complete nutrient content of four species of feeder insects." Zoo Biology 32:27-36. doi:10.1002/zoo.21012 · MSD Veterinary Manual — Nutrition in Reptiles