Large Black Soldier Fly Larvae for Sale
Large black soldier fly larvae, Hermetia illucens, are a soft, naturally calcium-rich feeder, often called calcium worms or BSFL. At about 3/4″, they are the largest size, suited to bigger reptiles and birds. They are high in protein and fat and carry essential amino acids, omega-3s, and prebiotics. Their soft body makes them easy to eat and digest.
The Calcium Worm
BSFL stand apart from most feeders. They are naturally high in calcium with a favorable calcium-to-phosphorus balance, so unlike crickets, mealworms, and roaches, they do not need dusting. That makes them a simple staple for building a calcium-rich diet, and they pair well with feeders you do dust for variety.
Calcium and Bone Health
Metabolic bone disease (MBD) develops when a reptile lacks calcium or UVB, leading to weak, deformed bones. Feeding BSFL regularly helps supply the calcium side of that balance. So worked into the diet each week, alongside proper UVB and husbandry, they support healthy bone growth, though they are one part of good care rather than a cure.
Easy to Keep
BSFL are low-maintenance. Keep them cool, around 55°F, in a wine cooler or the warmest part of the fridge, where they stay dormant for weeks with no feeding. Check the temperature with a thermometer, since a standard fridge often runs too cold. Bring them to room temperature before feeding, where they become active and tempt a feeding response.
Best For
- Adult bearded dragons and larger chameleons.
- Larger geckos, other reptiles, and birds.
- Building a calcium-rich staple diet.
- Keepers who want a no-dusting feeder.
Not Best For
- Smaller animals, which suit the medium or small size.
- The sole diet, since variety still matters.
- Animals that need only tiny prey.
Recommended Add-Ons
- Medium BSFL for mid-sized animals.
- Small BSFL for smaller animals.
- TC Calcium Ultra Fine to dust the other feeders in the rotation.
- Crickets as a varied feeder to pair with BSFL.
- Calcium Worms BSFL to browse all sizes and counts.
Frequently Asked Questions
What are large black soldier fly larvae?
They are Hermetia illucens, about 3/4″ and the largest size, a soft, naturally calcium-rich feeder also called calcium worms or BSFL. They suit larger reptiles and birds.
Do I need to dust BSFL?
No. They are naturally high in calcium with a favorable balance, so unlike most feeders they do not need dusting.
Do BSFL prevent MBD?
They help supply calcium, which supports bone health. Fed regularly alongside proper UVB and husbandry, they help prevent MBD, but they are one part of good care, not a cure.
How do I store them?
Keep them cool, around 55°F, in a wine cooler or the warmest part of the fridge, where they stay dormant for weeks. Check the temperature with a thermometer.
Which size should I get?
Choose large for bigger reptiles, the medium size for most animals, or the small size for smaller ones.
Learn More About Black Soldier Fly Larvae
These sources cover BSFL nutrition and their calcium content.
- NCBI: Black Soldier Fly Larvae Nutrition. Peer-reviewed research on the protein and mineral content of Hermetia illucens.
- NCBI: BSFL as Feed and Their Calcium. Research on the calcium-rich profile that sets BSFL apart from other feeders.
- ScienceDirect: Gut Loading (veterinary overview). A reference on feeder supplementation, useful for the other feeders you pair with BSFL.
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