If you raise chickens, reptiles, or insect-eating pets, you have probably asked this question: Are mealworms or black soldier fly larvae better?

Both insects are widely used as high-protein animal treats, but they differ dramatically in nutrition, calcium content, digestion, and sustainability.

In this guide, we break down the science behind mealworms vs black soldier fly larvae (BSFL) so you can choose the best option for your animals.

Quick Answer: Mealworms vs BSFL

If you want the short version:

Feature	Black Soldier Fly Larvae (BSFL)	Mealworms
Protein	~40%	~45%
Fat	~25%	~30%
Calcium	Extremely high	Very low
Ca:P Ratio	~2.6:1 (ideal)	~1:16 (poor)
Digestibility	Easy to digest	Harder shell
Immune Support	Lauric acid antimicrobial	Minimal
Sustainability	Recycles food waste	Grain-fed

Bottom line:
Mealworms are a tasty treat, but black soldier fly larvae are nutritionally superior for most animals, especially chickens and reptiles.

What Are Black Soldier Fly Larvae

Black soldier fly larvae (Hermetia illucens) are nutrient-dense insects raised as sustainable animal feed.

They have become one of the fastest growing protein sources in the global feed industry because they provide:

• high protein
• healthy fats
• naturally high calcium
• gut health benefits
• sustainable production

Brands like Supreme Grubs produce premium BSFL treats designed for backyard poultry and reptiles.

Unlike traditional feeder insects, BSFL are naturally rich in minerals and do not require calcium dusting.

What Are Mealworms?

Mealworms are the larval stage of the beetle Tenebrio molitor.

They are one of the most common feeder insects because they are:

• easy to farm
• high in fat
• widely available
• highly palatable for animals

However, despite their popularity, mealworms have several nutritional limitations, especially when used as a primary insect feed.

Nutrition Comparison: Mealworms vs BSFL

Both insects are rich in protein, but their nutritional profiles differ significantly.

Protein Content

Nutrient	BSFL	Mealworms
Crude Protein	~40%	~45–50%
Fat	~25%	~30%
Energy	High	Very high

Mealworms have slightly more protein, but BSFL provide a more balanced nutrient profile for most animals.

Calcium Content: The Biggest Difference

The most important nutritional difference is calcium.

Calcium to Phosphorus Ratio

Insect	Ca:P Ratio
BSFL	~2.6:1
Mealworms	~1:16

Animals like chickens, geckos, and bearded dragons require calcium for:

• bone development
• egg production
• muscle function
• nervous system health

Mealworms contain very little calcium, which means they often require calcium dusting or supplementation.

Black soldier fly larvae naturally contain 80–100x more calcium, making them one of the best feeder insects available.

For laying hens, this directly supports:

• stronger eggshells
• improved egg production
• healthier skeletal structure
  
  

Fat Profile and Immune Benefits

BSFL contain a unique fatty acid called lauric acid.

Why Lauric Acid Matters

Lauric acid is known for its antimicrobial properties.

Research shows it can help inhibit harmful bacteria such as:

• Clostridium
• Staphylococcus
• Salmonella

This supports:

• gut health
• immune function
• healthier digestion

Mealworms, on the other hand, are higher in omega-6 fats, which provide energy but offer fewer functional health benefits.

Digestibility: Which Is Easier for Animals?

Another important difference is the exoskeleton hardness.

Feature	BSFL	Mealworms
Shell hardness	Soft	Hard
Chitin	Moderate	Higher
Digestibility	Easier	Harder

Mealworms have a more rigid exoskeleton, which can be difficult for some animals to digest.

This is especially important for:

• juvenile reptiles
• small birds
• recovering wildlife

BSFL tend to be softer and easier to digest, making them safer as a regular treat.

Why BSFL Are Better for Chickens

For backyard flocks, BSFL offer several advantages.

Benefits for Chickens

Black soldier fly larvae help support:

• stronger eggshells
• improved feather health
• natural protein supplementation
• enrichment and natural foraging behaviour

Because they are rich in calcium, they are especially valuable for:

• laying hens
• older chickens
• birds recovering from stress or moulting

Many chicken keepers report that their flocks become extremely enthusiastic about BSFL treats, making them a great training and enrichment tool.

BSFL vs Mealworms for Reptiles

Reptile keepers often prefer BSFL for a simple reason: mineral balance.

Mealworms have been linked to metabolic bone disease (MBD) when used as a staple feeder insect.

BSFL help prevent this because they provide:

• naturally high calcium
• softer bodies
• improved digestibility

They are commonly recommended for:

• bearded dragons
• leopard geckos
• chameleons
• insectivorous lizards
  
  

Environmental Sustainability

Insect farming is rapidly expanding because it is far more sustainable than traditional feed sources.

Environmental Benefits of BSFL

Black soldier fly larvae can:

• convert food waste into protein
• reduce landfill methane
• require minimal land and water
• produce valuable organic fertiliser (frass)

In fact, BSFL can consume up to twice their body weight in organic waste per day.

This makes them one of the most powerful tools for building a circular agricultural economy.

When Mealworms Still Make Sense

Mealworms are not useless.

They still work well as:

• occasional treats
• high-energy snacks
• winter feeding supplements

Because they are high in fat, they can provide quick calories during cold months.

However, they should not be the primary insect feed for animals that require balanced minerals.

Final Verdict: BSFL vs Mealworms

Both insects have value, but for most animals black soldier fly larvae provide the superior nutritional profile.

Choose BSFL if you want:

• higher calcium
• better mineral balance
• immune-supporting fats
• easier digestion
• sustainable protein

Choose mealworms if you want:

• high-fat energy treats
• occasional enrichment snacks

For chickens, reptiles, and many insect-eating pets, BSFL are often the healthier long-term choice.

Try Premium BSFL for Your Flock

If you want to give your animals a more natural, nutrient-dense treat, consider switching to high-quality black soldier fly larvae.

Premium BSFL products like Supreme Grubs are carefully produced to provide:

• high protein
• natural calcium
• healthy fats
• safe, clean insect feed

Your chickens — and their eggshells — will thank you.