Calamus Oil
Acorus calamus
A sweet, reedy root oil named among the holy anointing spices but restricted today over a carcinogen.
Also known as sweet flag, vacha.
Origin
Marshlands of Asia, Europe, and North America (Acorus calamus).
Calamus essential oil is distilled from the rhizome of Acorus calamus (sweet flag). Its safety hinges on a single compound: beta-asarone, which is a procarcinogen in animal studies and is neurotoxic at high doses.
The U.S. FDA banned calamus as a food additive in 1968. Beta-asarone content varies enormously by variety: North American (Acorus americanus) and many European/diploid types are low or essentially free of it, while the Indian/tetraploid type can be extremely high (reported up to ~96%).
Because the carcinogenic risk is tied to a constituent that is often present and rarely disclosed with verifiable, batch-level testing on consumer listings, calamus does not currently clear the Blessing Approved standard. A clearly beta-asarone-free product with independent test results from a credible source could be revisited.
Traditional Uses
Calamus ('sweet cane' / 'sweet flag') is named in Exodus among the ingredients of the holy anointing oil and elsewhere as a fragrant imported spice.
Modern Uses
Modern use is sharply limited. The FDA has prohibited calamus as a food additive, and aromatherapy use is constrained by safety concerns; it occasionally appears in perfumery.
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