Rooibos is an herbal tea, not a “true” tea. It comes from a completely different plant than black, green, white, or oolong tea. While all of those are made from the leaves of the Camellia sinensis plant, rooibos is made from a shrub called Aspalathus linearis, a member of the legume (pea) family that grows only in a small region of South Africa. It contains zero caffeine naturally and has a mild, slightly sweet flavor that won’t turn bitter no matter how long you steep it.
A Different Plant Entirely
Rooibos (pronounced “ROY-boss”) means “red bush” in Afrikaans. The plant is a flowering shrub in the Fabaceae family, which makes it more closely related to chickpeas and lentils than to any tea plant. It grows exclusively in the Western and Northern Cape provinces of South Africa, particularly in the rugged Cederberg mountain region, where harsh, drought-prone conditions create the specific environment the plant needs. Attempts to cultivate it elsewhere have largely failed.
The needle-like leaves and stems of the plant are harvested, cut, and then either oxidized or dried immediately, depending on the type of rooibos being produced. Small-scale farmers in the region typically work plots of one to five hectares, often organized into cooperatives.
Red Rooibos vs. Green Rooibos
There are two varieties of rooibos on the market, and the difference comes down to processing rather than plant variety. Red rooibos, the far more common type, goes through an oxidation step (sometimes called fermentation) after harvesting. The cut leaves and stems are bruised and left to oxidize in the open air, which turns them a rich reddish-brown and develops the tea’s signature warm, honeyed aroma.
Green rooibos skips oxidation entirely. The freshly cut plant material is dried quickly with hot air in a closed unit to halt the natural oxidation process. The result is a lighter-colored tea with a grassier, more mineral taste. Green rooibos also retains higher concentrations of certain antioxidants, since oxidation breaks some of them down.
Why It’s Naturally Caffeine-Free
Unlike decaffeinated teas, which start with caffeine and have it removed through chemical or water processing, rooibos never contains caffeine in the first place. The Aspalathus linearis plant simply doesn’t produce it. This makes rooibos a genuinely caffeine-free option rather than a reduced-caffeine one, which is a meaningful distinction for people avoiding caffeine during pregnancy, for children, or for evening drinking.
Rooibos is also notably low in tannins, at roughly 4.4 percent compared to much higher levels in black and green tea. Tannins are the compounds responsible for the dry, astringent mouthfeel and bitterness you get when you oversteep regular tea. Because rooibos has so few of them, you can leave it steeping for 10 minutes or more without any bitterness developing. That forgiving nature makes it one of the easiest teas to brew.
What’s in It
Rooibos contains a unique set of plant compounds not found in Camellia sinensis teas. The two most abundant are aspalathin and nothofagin, both classified as dihydrochalcones. Together, these two compounds make up more than 90 percent of the metabolites detected in rooibos infusions. Green rooibos contains significantly more of both, since oxidation converts aspalathin into other compounds like orientin and isoorientin.
These compounds function as antioxidants, meaning they help neutralize reactive oxygen species in the body. Aspalathin in particular has drawn research interest for its effects on blood sugar regulation. In lab and animal studies, it increased glucose uptake in muscle cells and stimulated insulin secretion from pancreatic cells in a dose-dependent manner. It also appears to target enzymes involved in fat metabolism, which may explain why rooibos consumption has been associated with improved blood sugar control in some studies.
A systematic review of human studies found that regular rooibos consumption was linked to meaningful improvements in cholesterol markers. Participants saw LDL (“bad”) cholesterol drop from an average of 4.6 to 3.9 mmol/L, triglycerides fall from 1.7 to 1.2 mmol/L, and HDL (“good”) cholesterol rise from 0.9 to 1.2 mmol/L. Rooibos also increased plasma levels of total polyphenols and reduced markers of oxidative damage to fats in the blood.
Nothofagin, the other major compound, has shown diuretic and kidney-protective properties in research, linked to its ability to improve antioxidant capacity and increase nitric oxide availability, which helps blood vessels relax.
How It Tastes and How to Brew It
Red rooibos has a naturally sweet, slightly nutty flavor with hints of vanilla and caramel. It lacks the grassy bite of green tea or the malty depth of black tea. Many people drink it plain, though it also takes well to milk and honey. Green rooibos tastes lighter and more herbaceous, closer to a mild green tea but without the bitterness.
For brewing, use freshly boiled water and steep for five to six minutes, though you can go longer without penalty. If you’re drinking rooibos specifically for its antioxidant content, some evidence suggests using slightly lower temperatures (around 80°C or 175°F, similar to green tea brewing temperature) may preserve more of the heat-sensitive compounds. Use about one teaspoon of loose leaf rooibos per cup, or one tea bag.
How It Compares to True Tea
- Caffeine: Rooibos has none. Black tea has 40 to 70 mg per cup, green tea 20 to 45 mg.
- Tannins: Rooibos contains about 4.4 percent tannin. Black tea ranges from 11 to 20 percent.
- Bitterness: Rooibos doesn’t become bitter with long steeping. Black and green tea turn noticeably astringent after three to five minutes.
- Plant family: Rooibos is a legume. Tea is from the Theaceae family.
- Origin: Rooibos grows only in South Africa. Camellia sinensis is cultivated across Asia, Africa, and South America.
- Unique compounds: Rooibos contains aspalathin and nothofagin, which are not found in any true tea.
Technically, calling rooibos a “tea” is a convenience. In the strictest sense, only drinks made from Camellia sinensis leaves are tea. Everything else, including rooibos, chamomile, peppermint, and hibiscus, is a tisane or herbal infusion. But in everyday language, rooibos tea is universally understood and perfectly acceptable.