What it is
Calamus, or sweet flag, is an aromatic wetland plant. The rhizome has a long history of traditional use, but its chemistry varies substantially by plant variety and can include beta-asarone.
Traditional-use context
Historical use does not establish modern safety or efficacy. Because some calamus material can contain beta-asarone, this site does not recommend self-directed internal medicinal use.
Preparation context
No home oral preparation is recommended here. If calamus is encountered in a commercial product, check the applicable national rules and the product's safety information.
Quality and identification
Species identity, plant chemotype, and beta-asarone content matter. A generic label such as “calamus root” is not enough to establish safety.
Safety and precautions
The U.S. FDA lists calamus as prohibited for use as a food ingredient. Avoid ingesting homemade calamus preparations, especially during pregnancy or breastfeeding and in children. Seek professional toxicology or medical advice after significant accidental ingestion.
Evidence note
Traditional use and modern clinical evidence are not the same. Where an official monograph exists, this page uses it as a primary reference; otherwise claims are deliberately conservative.
U.S. FDA — Calamus prohibited food substanceDisclaimer: This page is for educational purposes only and does not provide medical advice. Herbal products can interact with medicines and may be inappropriate for some people. Consult a qualified clinician or pharmacist when symptoms are significant, persistent, or when you use prescription medicines.