About Prickly Ash
Prickly ash (Zanthoxylum americanum and Z. clava-herculis) bark and berries contain isoquinoline alkaloids (chelerythrine, magnoflorine), coumarins, and lignans. Sometimes called 'toothache tree' for traditional topical numbing application — chewing the bark causes oral tingling/numbness from sanshool alkaloids. Marketed as a 'circulatory stimulant' in 19th-century American Eclectic medicine and carried into modern herbal bitters; modern RCT evidence for circulatory, anti-inflammatory, or antimicrobial claims is essentially absent. SAFETY: photosensitization possible (coumarin content), additive bleeding risk with anticoagulants (in vitro platelet inhibition), and theoretical hepatic enzyme interactions. Avoid in pregnancy. The chelerythrine alkaloid has documented cytotoxicity in vitro at higher concentrations — unclear clinical relevance at supplement doses. Inclusion in cleanse bitters is purely traditional.
What Prickly Ash supports
- Topical sanshool tingling underlies traditional 'toothache tree' use; systemic claims are tradition-only
- Theoretical photosensitivity and additive bleeding risk; no modern safety RCTs
How much Prickly Ash to take
The RDA prevents deficiency. The effective range is what clinical trials used to actually move the outcome.
Effective
100–500
mg
Traditional Eclectic-era American herbalist dosing range. No modern clinical dose-finding studies — therapeutic dose is undefined.
Clinical evidence
Limited clinical evidence. Eclectic-medicine tradition; no modern clinical evidence for marketed circulatory or anti-inflammatory claims.
Reference