Sassafras tea has a long history as a folk remedy, but it carries a serious safety concern that changed its legal status decades ago. The root bark contains safrole, a compound the FDA banned from food and beverages in 1960 after animal studies linked it to liver cancer. That means traditional sassafras root bark tea, the kind brewed for centuries, is considered unsafe for regular consumption by U.S. regulatory standards.
Still, sassafras has a rich place in American culinary and medicinal tradition, and understanding what people historically used it for, what the actual risks are, and what legal alternatives exist is worth exploring.
Historical Uses of Sassafras Tea
Indigenous peoples in North America brewed sassafras root beverages for both medicinal and culinary purposes long before European colonization. Early settlers adopted the practice, and sassafras became one of the first exports shipped back to Europe, where it was marketed as a cure-all. Folk medicine traditions used sassafras tea as a spring “blood purifier,” a remedy for fevers, a treatment for urinary tract problems, and a way to ease joint pain and skin conditions.
Sassafras root was also the original flavoring behind root beer. Recipes resembling modern root beer date back to the 1860s, combining sassafras with sarsaparilla, licorice root, mint, and nutmeg. After the FDA ban, commercial root beer makers switched to artificial sassafras flavoring or safrole-free extracts.
Why the FDA Banned Sassafras in Food
The ban comes down to one compound: safrole, which makes up a large percentage of sassafras root bark oil. When your liver processes safrole, enzymes convert it into a molecule called 1′-hydroxysafrole. That molecule then undergoes a second chemical reaction that produces an unstable, highly reactive compound. This reactive compound binds to DNA and other cellular structures, which is the mechanism behind its cancer-causing potential. In animal studies, this process led to liver tumors.
A second pathway also contributes to the risk. Safrole can be broken down into a different metabolite that transforms into a reactive molecule called a quinone methide, which similarly damages cells. These aren’t theoretical concerns. They’re well-characterized biochemical pathways that have been studied for decades.
Under federal regulation, any food containing added safrole or oil of sassafras is considered adulterated. The rule specifically names sassafras tea as an example, calling sassafras bark a “vehicle for imparting” safrole into a beverage.
What Sassafras Tea Actually Contains
The root bark of the sassafras tree has three primary chemical components: safrole, methyleugenol, and camphor. None of these have strong evidence supporting the health claims traditionally made about sassafras tea. The folk reputation as a blood purifier, fever reducer, or joint remedy hasn’t been validated by modern clinical research.
This is an important distinction. Many herbal teas that were historically valued have turned out to contain compounds with measurable, beneficial activity. Sassafras is not one of them. The compounds it’s best known for are either toxic or lack demonstrated therapeutic value in humans.
Acute Side Effects and Allergic Reactions
Beyond the long-term cancer risk, sassafras can cause immediate adverse effects. Some people experience allergic reactions ranging from mild skin rashes and hives to more serious symptoms like throat swelling, difficulty breathing, a racing heart, and swollen lymph nodes. Digestive symptoms including nausea, vomiting, and stomach cramps have also been reported.
In large amounts, safrole acts as a toxin that can damage the liver and central nervous system. The dose at which this occurs varies, but the concern isn’t limited to people drinking massive quantities. Regular consumption of even modest amounts is what regulators flagged as problematic, because safrole’s cancer-promoting effects are cumulative.
Safrole-Free Sassafras Products
Not all sassafras products are banned. Federal regulations allow safrole-free extract of sassafras to be used as a food flavoring. This extract is made by processing the root bark with dilute alcohol, concentrating the solution, diluting it with water, and then discarding the oily fraction that contains safrole. The resulting purified extract retains some of the characteristic sassafras flavor without the problematic compound.
This is what modern commercial root beer uses when it includes sassafras at all. If you’re looking for that distinctive earthy, slightly sweet sassafras flavor, safrole-free extracts are the legal and safer option.
Sassafras Leaves Are a Different Story
There’s an important distinction between sassafras root bark and sassafras leaves. Filé powder, a staple of Creole and Cajun cooking, is made from dried and ground sassafras leaves. Unlike the root bark, the leaves do not contain significant amounts of safrole. Filé powder is considered safe to eat and is widely used as both a thickening agent and a flavor enhancer, particularly in gumbo.
So while brewing tea from sassafras root bark puts you in contact with safrole, using sassafras leaves in cooking does not carry the same risk. The two parts of the same tree have very different chemical profiles.
The Bottom Line on Benefits
The honest answer to “what is sassafras tea good for” is that no proven health benefits justify the known risks. The traditional claims about blood purification, fever reduction, and pain relief were never confirmed through rigorous study, and the primary active compound in the root bark is a recognized carcinogen. If you enjoy the flavor, safrole-free sassafras extracts and sassafras leaf products like filé powder offer a way to get it without the safety concerns that prompted the FDA to pull sassafras bark from the food supply over six decades ago.