Silkworms are best known for producing silk fabric, but their uses extend far beyond textiles. These insects play roles in medicine, cosmetics, food production, animal feed, scientific research, and even vaccine development. Here’s a breakdown of every major way silkworms are put to use today.
Silk Textile Production
The primary use of silkworms, specifically the domesticated species Bombyx mori, is producing silk thread. A single cocoon yields a continuous filament up to 1,500 meters long. Workers unravel these cocoons, twist the filaments together, and weave them into fabric prized for its softness, strength, and natural sheen. This process, called sericulture, has been practiced for over 4,000 years.
China is the world’s largest silk producer and chief supplier to global markets, followed by India. Production spans more than 60 countries, though silk accounts for less than 0.2% of the global textile market by volume. Its value per unit, however, is far higher than most fabrics, which is why the industry supports millions of workers worldwide, particularly in rural communities across Asia.
How Silk Compares to Synthetic Fabrics
Silk production is significantly less energy-intensive than manufacturing synthetic fibers like polyester or nylon, which require petroleum-based chemical processing and extrusion. Life cycle analyses suggest silk is up to 1,000 times more energy-efficient in its formation compared to polyethylene. Silk also carries a lower carbon footprint than petroleum-derived synthetics and doesn’t generate the microplastic pollution that synthetic fabrics shed into waterways with every wash.
Medical Sutures and Biomaterials
Silk has been used as surgical suture material since the Roman Empire, and it remains in operating rooms today. The protein that makes up silk fiber, called fibroin, is exceptionally compatible with human tissue. The body tolerates it well, it holds knots securely, and it degrades at a predictable rate.
Beyond sutures, silk fibroin has become a promising material in regenerative medicine. Researchers use it to build three-dimensional scaffolds, essentially temporary frameworks that guide new tissue growth. These scaffolds are especially useful in bone regeneration, where they need to be stiff enough to bear weight while slowly dissolving as new bone fills in. In lab and animal studies, silk scaffolds implanted in bone defects have shown strong biocompatibility and appropriate early markers of healing. The material resists breaking down too quickly thanks to its natural protein structure, giving new tissue time to form before the scaffold disappears.
Skincare and Cosmetics
Silkworm cocoons contain a second protein alongside fibroin called sericin, which coats the silk threads and acts like a glue. In the textile process, sericin is typically washed away. But cosmetics manufacturers have found it remarkably useful. Sericin is a potent moisture-retaining agent with natural antioxidant properties, UV-protective effects, and strong affinity for keratin, the protein that makes up skin and hair. It also forms a smooth film on the skin’s surface, which is why it shows up in moisturizers, serums, and anti-aging products. Studies have highlighted its skin-soothing, elasticizing, and anti-inflammatory properties, making it a versatile ingredient in modern skincare formulations.
Edible Protein Source
In many parts of Asia, silkworm pupae (the stage inside the cocoon after the silk has been harvested) are eaten as food. They’re a nutritional powerhouse. Dried silkworm pupae contain roughly 34 to 72% protein by weight, with most samples landing in the 50 to 60% range. Fat content ranges from about 19 to 58%, and they supply meaningful amounts of minerals including calcium (92 to 181 mg per 100 g), magnesium (89 to 280 mg), potassium (477 to 672 mg), and iron (2.8 to 5 mg).
That protein density rivals or exceeds most conventional animal protein sources, which is why silkworm pupae are gaining attention as a sustainable food ingredient. They’re commonly fried, boiled, or seasoned as street food in countries like South Korea, China, Thailand, and Vietnam. As interest in edible insects grows globally, silkworm pupae are among the most studied candidates for wider adoption.
Animal Feed
Silkworm pupae are widely used as animal feed in Southeast Asia, where they’re a natural byproduct of the silk industry. Ground into meal, they serve as a high-protein substitute for fishmeal in diets for poultry, pigs, fish, crustaceans, and ruminants. In a recent study on rabbits, adding silkworm pupae meal to their diet significantly improved body weight gain, daily growth rate, and feed conversion (meaning the animals gained more weight per unit of food consumed). The supplemented rabbits also showed better protein digestion, higher plasma protein levels, enhanced antioxidant capacity, and reduced oxidative stress, all without any negative effects on kidney function, carcass quality, or overall health.
Vaccine and Drug Production
Genetically modified silkworms are used as living factories for producing human proteins. The approach works by infecting silkworm cells with engineered viruses that carry instructions for making a target protein. The silkworm’s cellular machinery then churns out large quantities of that protein, which can be harvested and purified.
During the COVID-19 pandemic, researchers used this baculovirus-silkworm system to rapidly produce the SARS-CoV-2 spike protein. The purified protein was then used in immunodetection kits, as an antigen for generating antibodies, and as a component in vaccine development. This system is faster and cheaper to scale than traditional cell-culture methods, making silkworms a practical platform for responding to emerging infectious diseases.
Scientific Research Models
Silkworms share a surprising number of genetic pathways with humans, making them useful stand-ins for studying certain diseases. Several silkworm mutant strains mirror specific human genetic conditions. One strain, called “albino,” carries a mutation that blocks the same metabolic pathway disrupted in human phenylketonuria, a disorder that causes intellectual disability if untreated. Another strain called “lemon” has a defect that closely mimics sepiapterin reductase deficiency, a rare movement disorder in humans. The lemon silkworm is currently the only known animal model for this specific disease.
Researchers also use silkworms to study sepsis (when overstimulation of the silkworm’s immune system causes organ damage similar to what happens in human sepsis), to screen new antimicrobial drugs, to test potential anticancer compounds, and to monitor environmental safety. Their short life cycle, low cost, and minimal ethical concerns compared to mammalian models make them an increasingly popular choice in laboratories.