Eden Apothecary · Herb Profile
Krameria lappacea
Pronounced Rhatany: RAT-uh-nee. Krameria triandra: kruh-MEER-ee-uh try-AN-druh.
Cool and drying: the master astringent that tightens boggy, weeping, and passively bleeding tissue back into tone.
Insufficient reliable data; avoid internal medicinal doses in pregnancy. Occasional dilute oral-rinse use is likely low risk but is not well studied. Modern references note there is not enough information to establish safety, and high-tannin astringents are traditionally avoided.
Insufficient data; avoid internal medicinal use while breastfeeding. Tannins may bind minerals and reduce absorption. Topical and oral-rinse use is likely low risk.
No pediatric safety data for internal use; not recommended internally for children. If used as a supervised oral rinse or gargle, ensure it is not swallowed.
Very high tannin content (roughly 10 to 20 percent, and up to about 40 percent in the root bark). Frequent or prolonged internal use can irritate the gastrointestinal lining and impair absorption of iron, minerals, and protein. It rarely causes allergic reactions of the mouth and throat lining. It astringes without any demulcency, so it is unsuited to dry, atrophic tissue. Limit internal use to short courses and topical or oral use to under two weeks.
Do not use to suppress acute infective diarrhea or dysentery before the cause is evaluated, since astringing may retain the pathogen and mask serious infection. Avoid in constipation and in dry, atrophic mucous membranes. Discontinue with any hypersensitivity reaction.
At risk. Rhatany is a slow-growing Andean hemiparasitic shrub, and the medicinal part is the root, so harvest typically kills the plant. The species in trade (Krameria lappacea, long sold as K. triandra) is considered overexploited and endangered in its Andean deserts, and sustainable wild harvest has rarely been achieved. Prefer cultivated or verified responsibly wild-crafted sources, and consider local astringent substitutes such as oak bark, tormentil, or cranesbill (geranium) to reduce pressure on wild stands.
Not in canonical biblical texts; native to the Andes of Peru and Bolivia and long used by Andean peoples. It entered European and American materia medica in the early 19th century and became a standard astringent of Eclectic medicine.
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