Educational information, not medical advice — ask your doctor or midwife.
What is Bombyx mori? It is the domestic silkworm, the insect raised to make silk. In herbal trade, the dried larva, the pupa, or a powder of the whole insect is sold.
It is an animal product, not a plant. The silkworm eats only mulberry leaves, so some mulberry compounds build up in its body. Much of the interest in it comes from that fact.
In Chinese medicine the best known form is jiang can, the "stiff silkworm". These are larvae killed by a mould, then dried. Roasted pupae are also a street food in Korea, China and Thailand.
Here is the honest verdict. Good human trials are very scarce. Long use in tradition is not proof that something works, and it is not proof that it is safe.
The clearest risk is allergy. Silkworm protein has caused severe reactions, including sudden breathing trouble, in people who eat it or breathe its dust.
How is it meant to work? Most of the proposed actions come from lab work, not from people.
Silkworm powder holds 1-deoxynojirimycin (DNJ), a sugar-like compound taken up from mulberry leaves. In test tubes, DNJ blocks alpha-glucosidase, a gut enzyme that breaks starch into sugar. The idea is that less sugar then enters the blood after a meal.
That step has been shown mainly for mulberry leaf extracts, not for the insect itself. Whether silkworm powder does the same thing in your gut is not settled.
Silk proteins called fibroin and sericin break into small peptides when digested. In animal studies these peptides have been linked to lower blood fats and to wound healing. Human proof is lacking.
Traditional Chinese ideas about jiang can describe it as moving "wind" and "phlegm" and easing spasms. Those are ideas from within that system. They have not been tested as drug actions in modern trials.
How is it sold? Several very different products share the name.
- Dried whole larvae (jiang can) sold by Chinese herb shops, usually boiled into a decoction. - Powder or capsules made from dried silkworms or pupae.
- Roasted or canned pupae eaten as food in parts of East and Southeast Asia. - Silk peptide powders, sold as protein or beauty supplements. - Sericin and fibroin in creams and wound dressings.
Food-grade pupae and herb-grade jiang can are not the same product. Jiang can is a medicinal item and is processed with a mould.
Quality control is uneven. Insect powders can carry bacteria or mould if they were dried or stored badly.
Where does its use come from? Chinese medical texts are the main source.
The stiff silkworm was listed in the Shennong Bencao Jing, a Han dynasty herbal from roughly the first to second century. Later texts kept it in use for over a thousand years. Classical writers applied it to convulsions in children, facial palsy, sore throat, headache and skin blemishes.
Silkworm pupae had a second life as food. They were a cheap protein left over from silk reeling, and were eaten across China, Korea and Japan.
Korean and Japanese records also describe pupae as a tonic food for weak or recovering people. These were kitchen and clinic customs, written down long before modern testing existed.
This page reports that history. It does not suggest that you copy it.
Call emergency services at once if you get swelling of the lips, tongue or throat, wheezing, trouble breathing, spreading hives, vomiting with faintness, or you feel you may pass out. These are signs of severe allergic shock (anaphylaxis).
Stop it and see your doctor soon if you get an itchy rash, repeated stomach upset, or a joint flare in the big toe.
If you take diabetes medicine, see your doctor if your readings start running low. Signs are shaking, sweating, hunger and confusion.
In the United States, silkworm products are sold as foods or dietary supplements and are not approved as drugs. In the European Union, insects need novel food approval, and Bombyx mori is not on the authorised list. Dried jiang can is an official herb in the Chinese Pharmacopoeia.
Evidence grades and traditional-use labels are explained in our methodology. Nothing here is medical advice.
What it is typically used for, usual dose, cautions, and the study behind it where real trial data exists.
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