gyenaegeum
Quick Facts
- What it is: Gyenaegeum is the dried inner lining of a chicken's gizzard, used in Korean herbal medicine for a bloated belly and poor appetite.
- Main uses: Bloating and fullness after eating, Poor appetite, Poor appetite and slow weight gain in children
- Best for: Short-term use for a heavy, stuck feeling after a large meal
- Active ingredients: Keratin (a tough protein), Pepsin-like enzymes (proteins that break down food), Ventriculin, Free amino acids (protein building blocks), Trace minerals
- Forms: Toasted powder, Dried pieces for a decoction (long-simmered herb tea), Pills, granules and liquid extracts from herbal clinics, An ingredient inside mixed herbal formulas
- Time to effect: Traditionally hours to a few days; not measured in any trial.
- Side effects: Usually mild stomach upset; the main risks are chicken or egg allergy and poorly handled material.
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What is gyenaegeum?
Gyenaegeum is the dried inner lining of a chicken's gizzard. The gizzard is the grinding part of a bird's stomach. In Korean herbal practice the lining is peeled off, cleaned, dried and often toasted.
It is used for a heavy, bloated belly after eating. Folk use also covers poor appetite in children who gain weight slowly. Older texts add stones in the urine and bed-wetting in children.
The Latin name for the source animal is Gallus gallus domesticus. You may also see it called chicken gizzard lining, or by its Latin drug name endothelium corneum gigeriae galli. It is a single drug, not a blend, though it is usually mixed into a formula.
Here is the short verdict on evidence. Human trial evidence is very thin, so we grade it insufficient. Its standing rests on hundreds of years of use, not on modern testing, and long use is not proof that something works.
How does gyenaegeum work?
The honest answer is that nobody has shown how it works in people.
The idea is simple. A bird's gizzard grinds tough food, and the lining holds traces of the bird's own gut juices. Healers reasoned that eating it would help a person grind down heavy food.
Lab and animal work gives partial support. In animals, the powder has raised stomach acid and sped up how fast the stomach empties. Whether that happens in a person, at the doses people take, has not been tested well.
In Korean and Chinese theory the drug is said to move stuck food and to settle the stomach. That is a traditional way of speaking, not a proven body process.
What forms does gyenaegeum come in?
Powder is the main form you will meet.
The dried lining is toasted, then ground fine. Korean and Chinese practice treats the powder as stronger than a tea made from the same amount.
It is also sold as whole dried pieces for making a decoction (a long-simmered herb tea). This is the older way to take it.
Herbal clinics may supply it inside mixed formulas, as pills, granules or a liquid extract.
Buy it only from a licensed herbal supplier. Never scrape and dry the lining from a raw chicken at home. Raw poultry can carry Salmonella and Campylobacter (germs that cause food poisoning).
Where it comes from:
Gyenaegeum is an old East Asian drug, not a modern supplement.
It appears in the Chinese Shennong Bencao Jing, a herb text from around the first or second century. Korean medicine took it up and it is listed in the Donguibogam, Heo Jun's great Korean medical work of 1613.
Japanese Kampo practice uses it too. It has stayed in use in Korea ever since, mostly for children who eat poorly and for adults with a full, gassy belly after meals.
Who should avoid gyenaegeum?
- Do not use if you are allergic to chicken, poultry or egg, because this is an animal product and can set off the same reaction.
- Do not use if you prepared it yourself by scraping the lining from a raw chicken at home, as raw poultry can carry Salmonella and Campylobacter (germs that cause food poisoning).
- Do not use if you are pregnant or breastfeeding, unless a doctor or qualified herbalist says otherwise, because it has not been tested in pregnancy.
- Do not give it to a baby or young child without first having a doctor check why the child is not eating or growing.
- Do not use if you have a peptic ulcer (a sore in the stomach lining) or bad reflux, as it may raise stomach acid and make you worse.
- Do not use if you take medicine for diabetes, unless your doctor agrees and you watch your blood sugar, because animal reports suggest it may lower blood sugar.
- Do not use if you avoid animal products for religious or personal reasons, as it is made from chicken.
- Never rely on it instead of medical care for kidney or bladder stones, as a blocked kidney can cause lasting damage.
When should you see a doctor?
See a doctor if your bloating or belly pain lasts more than two weeks, or keeps coming back.
Go to a doctor the same day if you have blood in your vomit or stool, black tarry stools, a fever, or pain that keeps getting worse.
Get urgent help if you get a rash, swollen lips or face, or trouble breathing after taking it. That can be a serious allergic reaction.
See a doctor before using it in a child who is losing weight, not growing, or wetting the bed after being dry. Also see a doctor for any back or side pain with blood in the urine, which may mean a stone.
Evidence grades and traditional-use labels are explained in our methodology. Nothing here is medical advice.
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