5 Reasons to Choose Silkworms
Silkworms (Bombyx mori) sit in a category of their own among feeder insects. Here’s why experienced reptile keepers reach for them when nothing else delivers.
1. The best calcium-to-phosphorus ratio of any common feeder
Most feeder insects have Ca:P ratios between 1:8 and 1:20 — far short of the 2:1 a growing reptile needs. Silkworms come in at ~1:1.4, dramatically closer to the target. That means less calcium dusting, fewer MBD risks, and better long-term bone health for animals that are otherwise calcium-deficient.
2. Ultra-low fat — half what mealworms deliver
At ~10% fat by dry weight, silkworms are dramatically leaner than the alternatives: mealworms run 28%, waxworms 50%+. For adult reptiles that gain weight easily on rich feeders (leopard geckos, AFTs, adult bearded dragons), silkworms let you offer real meal volume without driving obesity.
3. Soft-bodied and gentle on the gut
Thin cuticles instead of hard exoskeletons mean silkworms are safe for hatchlings, seniors, and any reptile with chewing difficulties. They’re also one of the few feeders appropriate for animals recovering from illness or shipping stress — minimal digestive strain, maximal nutritional payoff.
4. Complete amino acid profile
Silkworm protein contains all nine essential amino acids in ratios that suit vertebrate metabolism. Aquaculture studies have shown silkworm meal can replace 30–50% of fishmeal in growth diets without performance loss — a strong indicator of nutritional completeness. For your reptile, that means a silkworm meal is a complete-protein meal, not a partial nutrition profile.
5. Naturally antimicrobial — unusually clean to feed
Silkworms produce cecropins— antimicrobial peptides that resist bacterial colonization. The practical effect for keepers: silkworms are unusually clean to feed and rarely transmit pathogens. They’re also unusually disease-resistant in storage compared to other feeders.
How to use them well
Silkworms are a premium supplement, not a staple. Use them at 20–30% of insect intake alongside calorie-dense staples like discoid roaches or crickets. Hatchling and juvenile reptiles benefit most — silkworm calcium balance directly supports bone development in growth phases.
For depth on silkworms by species, see our complete silkworms 101 guide or species-specific guides for bearded dragons, chameleons, and leopard geckos.
Browse the silkworm collection — currently paused while AAC transitions, sign up for restock alerts on the collection page.