Herbal tea is any drink made by steeping plant material in hot water, as long as it doesn’t contain leaves from the Camellia sinensis plant. That single plant is the source of all “true” teas: black, green, white, oolong, and pu-erh. Everything else, from chamomile to peppermint to rooibos, is technically not tea at all. The more precise term is “tisane,” though “herbal tea” has become the standard label on store shelves.
Why Herbal Tea Isn’t Actually Tea
The distinction is botanical. True tea always comes from Camellia sinensis, a shrub native to East Asia. The different types you see (black, green, white) are all the same plant processed in different ways: more oxidation produces black tea, less produces green, and minimal processing yields white. They all contain caffeine because the plant itself produces it.
Herbal teas skip that plant entirely. They’re made from dried fruits, flowers, roots, bark, seeds, or leaves of other plants. The word “tisane” traces back through French to the Greek word ptisanē, meaning “crushed barley,” reflecting the long history of steeping various plants in water as folk medicine. Today the two terms, herbal tea and tisane, are used interchangeably.
What Goes Into Herbal Tea
Nearly any edible plant material can become an herbal tea. What varies is which part of the plant you use, and that affects both flavor and how you prepare it.
- Flowers: Chamomile, hibiscus, lavender, jasmine, and wild bergamot. These tend to produce lighter, aromatic brews.
- Leaves: Peppermint, spearmint, lemon balm, raspberry leaf, and rooibos. Raspberry leaf tea has a long history of use for colds and sore throats.
- Roots and rhizomes: Ginger, turmeric, licorice root, and valerian. In India, ginger tea is traditionally made by steeping peeled, grated rhizome with cinnamon in boiling water.
- Seeds and bark: Cinnamon bark, fennel seed, and slippery elm bark. These tougher materials need more heat and time to release their flavor.
- Fruits and berries: Rosehip, dried apple, elderberry, and lemon peel. Fruit-based blends are naturally sweet and often caffeine-free.
Many commercial herbal teas combine several of these categories in a single blend, pairing something floral like chamomile with something warming like ginger.
The Caffeine Question
Most herbal teas contain zero caffeine, which is one of their biggest selling points. But there are notable exceptions. Yerba mate, made from the leaves of a South American holly plant, averages about 78 milligrams of caffeine per cup, roughly the same as a cup of green tea. Guayusa, another holly species from the Amazon, contains caffeine at concentrations nearly identical to Camellia sinensis tea (around 2.9 to 3.2% by weight). Both are sold as herbal teas or tea alternatives, but they will absolutely keep you up at night if you drink them before bed.
If you’re choosing herbal tea specifically to avoid caffeine, stick with options like chamomile, peppermint, rooibos, or hibiscus. If a product contains yerba mate, guayusa, or guarana, treat it like regular tea or coffee in terms of stimulant effects.
How to Brew Different Types
There are two basic preparation methods, and which one you use depends on what part of the plant you’re working with.
For delicate parts like leaves, flowers, and dried fruits, use an infusion: boil water, remove it from the heat, pour it over the herbs (about one teaspoon per cup), cover, and let it steep for 5 to 10 minutes. Covering the cup matters because it traps volatile oils that would otherwise evaporate, taking flavor and aroma with them.
For tougher materials like roots, bark, and seeds, use a decoction. Place the ingredients in cold water, bring it to a gentle boil, then simmer for 10 to 30 minutes depending on how dense the material is. Cinnamon bark and dried ginger root, for example, need that sustained heat to break down their structure and release flavor. If you simply poured hot water over a chunk of dried ginger and waited five minutes, you’d get a fairly bland cup.
Active Compounds in Popular Varieties
Herbal teas aren’t just flavored water. The plants they come from contain bioactive compounds that give each variety its characteristic effects.
Chamomile’s calming reputation comes from a group of compounds including the flavonoid apigenin, along with other plant chemicals like quercetin and luteolin. These interact with receptors in the brain that promote relaxation, which is why chamomile is the go-to recommendation for a before-bed drink.
Peppermint gets its cooling sensation and digestive benefits primarily from its essential oils, while its leaves also contain rosmarinic acid, a compound with anti-inflammatory properties found across the mint family.
Rooibos, a South African plant, contains a unique antioxidant called aspalathin that isn’t found in any other food source. Aspalathin and a related compound called nothofagin make up more than 90% of the beneficial plant chemicals in rooibos tea. Unfermented (“green”) rooibos contains roughly three times the total antioxidant content of the more common fermented (“red”) version, so if antioxidant content matters to you, look for green rooibos specifically.
Drug Interactions Worth Knowing About
Because herbal teas contain active compounds, some can interfere with medications. This is easy to overlook since most people think of herbal tea as harmless, but the interactions can be meaningful.
Chamomile, one of the most widely consumed herbal teas, may reduce the effectiveness of oral contraceptives and can interact with blood-thinning medications like warfarin. Goldenseal tea poses a higher risk: it inhibits two major enzymes responsible for metabolizing more than half of common pharmaceutical drugs, and has been shown to reduce blood levels of the diabetes medication metformin by about 25%. Ginkgo biloba tea increases the risk of major bleeding when combined with warfarin. St. John’s wort is one of the most interaction-prone herbs available, affecting a wide range of medications including antidepressants, birth control, and drugs used after organ transplants.
Even something as common as green tea (which is technically a true tea, not herbal) can reduce the effectiveness of certain blood pressure and cholesterol medications at high doses. The broader point applies to herbal varieties too: if you take prescription medications and drink herbal tea daily, it’s worth checking whether your specific combination poses a problem.
How Herbal Tea Is Labeled and Regulated
In the United States, herbal teas occupy an unusual regulatory space. When sold as a simple beverage, they’re regulated as food. But when a product makes claims about health benefits, it can fall under the Dietary Supplement Health and Education Act of 1994, which means it’s regulated as a dietary supplement instead. Dietary supplements have different labeling requirements, including a “Supplement Facts” panel rather than a standard “Nutrition Facts” label.
This distinction matters because dietary supplements don’t require FDA approval before they go to market. The manufacturer is responsible for ensuring safety, but there’s no pre-sale testing requirement. So when you pick up a box of herbal tea that says “supports immune health” on the front, that claim hasn’t been verified by the FDA. The ingredient list on the side panel is your most reliable source of information about what’s actually in the cup.