The tree itself is not sassafras poisonous in any way you need to fear in the yard. You can touch the leaves, prune the branches, and grow one without a single worry. The real concern lives in the concentrated oil pressed from the roots and bark. It does not live in the plant you walk past every day.
So handle the tree freely. Rake its mitten-shaped leaves in fall and snap a twig to smell that root-beer scent. You can plant it as a shade tree with no gloves and no fuss at all. None of that puts anything harmful into your body. The plant is safe to grow and safe to stand near.
The trouble starts with a compound called safrole. This is the aromatic oil that gives sassafras its sweet, spicy smell. It sits in high amounts inside the root bark, where the scent is strongest. When you press or steep that bark to pull the oil out, you concentrate the one part of the tree that raises a real health flag.
The National Toxicology Program lists safrole as reasonably anticipated to be a human carcinogen. In feeding studies it caused liver tumors in two separate rodent species, rats and mice. That double result is why regulators treat it as a real risk and not a maybe.
That ruling is why safrole counts as a safrole carcinogen in the eyes of public health agencies. The data did not come from one odd lab result. Two rodent species grew liver tumors after eating safrole. That double signal is what pushed the compound onto the official watch list. The molecule itself is the problem, not the tree that holds it.
Some people worry the bark is sassafras poisonous to the touch, but that is not how safrole works. The compound has to be pulled out and swallowed in real amounts to matter. Brushing against the bark or breathing the scent does nothing to you. Your skin is not a doorway for it. Eating a strong root extract is the only path that builds up a meaningful dose.
The response from regulators was direct. The FDA banned safrole from food back in 1960. That is why you no longer find true sassafras in commercial root beer. The soda still tastes the same as it always did. Makers just switched to safrole-free flavorings decades ago. So the version on store shelves carries none of the old risk.
Here is the part that surprises people. Safrole is not unique to sassafras at all. It shows up in small amounts in cinnamon, nutmeg, and black pepper. Those three spices sit in nearly every kitchen drawer. The average person already takes in an estimated 0.3 mg of safrole a day from normal food. That tiny background trace has never been the worry.
Dose is the whole story here. A pinch of nutmeg on a latte gives you a trace amount. A strong brew made from raw root bark gives you far more than that. The danger climbs with how much concentrated safrole you swallow. It does not climb just because the molecule touches your plate. Tiny background amounts are a normal part of eating.
For real sassafras safety, keep two ideas apart in your head. Growing, touching, and pruning the tree carries no danger at all. Enjoy it in the landscape and let kids climb it. Drinking concentrated extracts from its root is the part that calls for care. The whole risk lives in what you consume, not in what you plant.
So the short answer holds up well. The tree is friendly and the oil is the catch. Want the full rundown on brewing the root into a drink? The safety steps and limits live in the dedicated sassafras tea question. There is room there to cover the steeping details right and to walk through how much is too much.
Read the full article: Sassafras Tree: Leaves, Uses and Safety
