Clinical knowledge archive
Corydalis and Liver Safety: What Nerve Honey Buyers Should Know
Nerve Honey contains 100 mg of Corydalis yanhusuo powder, an herb whose alkaloids were behind the Jin Bu Huan hepatitis cases and which a 2025 study tied to idiosyncratic liver injury; yellow skin, dark urine or right-sided belly pain mean stop and get liver tests.
Updated November 6, 2026Sources linked below
Why corydalis gets its own page
Corydalis yanhusuo is the most pharmacologically active herb in Nerve Honey, and the one with a documented safety signal. At 100 mg of powder a day the amount is modest, but liver reactions to herbs are often idiosyncratic, meaning they depend on the person more than on the dose.
The history: Jin Bu Huan
A Rocky Mountain Poison Center report described a Chinese herbal product, Jin Bu Huan, whose active alkaloid was levo-tetrahydropalmatine, the same family of compounds found in corydalis. Long-term use in adults was linked to hepatitis, and a single swallowed dose in children produced life-threatening nervous-system and heart effects[1].
The current evidence
A 2025 laboratory and clinical-data study described Corydalis yanhusuo as a cause of idiosyncratic liver injury and explored immune-related mechanisms[2]. The NIH LiverTox resource lists Chinese herbal medicines, including tetrahydropalmatine-containing products, among recognized causes of drug-induced liver injury[3]. Meanwhile, the pain research behind corydalis rests largely on animal studies of its alkaloids[4].
Signs to stop immediately
- Yellowing of the skin or the whites of the eyes
- Dark urine or pale stools
- Pain or tenderness under the right ribs
- Unusual fatigue, nausea or loss of appetite that starts after beginning the capsule
Stop the product, see a clinician and ask for liver tests. Report the reaction through the FDA's MedWatch program.
Who should avoid it or ask first
- Anyone with liver disease, hepatitis or a past drug-induced liver reaction.
- People who drink alcohol heavily or take medicines with known liver effects.
- Anyone taking sedatives, since corydalis alkaloids add drowsiness.
- Pregnant or nursing women, and anyone under 18 (excluded on the label).
A practical approach
If you and your clinician decide to try Nerve Honey, ask for baseline liver tests, keep to the label's two capsules, and avoid other corydalis products at the same time. The protocol page covers the full interaction check.
Sources
- 1Horowitz RS, Feldhaus K, Dart RC, Stermitz FR, Beck JJ. The clinical spectrum of Jin Bu Huan toxicity. Arch Intern Med. 1996;156(8):899-903.
- 2Guo L, Lin L, Ling J, et al. A new discovery: Corydalis yanhusuo causes idiosyncratic hepatotoxicity and its potential mechanisms. Biomed Chromatogr. 2025;39:e70093.
- 3LiverTox: Clinical and Research Information on Drug-Induced Liver Injury. Chinese and other Asian herbal medicines. Bethesda (MD): National Institute of Diabetes and Digestive and Kidney Diseases; 2012-.
- 4Zhang Y, Wang C, Wang L, et al. A novel analgesic isolated from a traditional Chinese medicine. Curr Biol. 2014;24(2):117-123.