What Exactly Is Rooibos Tea?
Often called 'red bush tea', rooibos is not a true tea in the traditional sense as it doesn't come from the Camellia sinensis plant like black or green tea. Instead, it's a herbal infusion, or tisane, made from the fermented leaves of the Aspalathus linearis
shrub, which grows exclusively in South Africa's Cederberg region. There are two main types: the more common 'red' rooibos, which is fermented (oxidized) and has a rich, slightly sweet flavour, and 'green' rooibos, which is unfermented and has a grassier taste. A huge part of its growing appeal is that it's naturally caffeine-free and low in tannins, the compounds that can sometimes cause bitterness in black tea and may interfere with iron absorption.
The Heart Health Connection
The wellness buzz around rooibos centres on its potential cardiovascular benefits. The primary claims suggest that regular consumption may help improve cholesterol levels, lower blood pressure, and protect against oxidative stress—a key factor in the development of heart disease. These potential benefits are largely attributed to the unique profile of antioxidants found in the rooibos plant, which are quite different from those in green or black tea. While traditional use has long pointed to its health-giving properties, modern science is now beginning to investigate these claims more formally.
Meet Aspalathin: A Unique Antioxidant
Much of the scientific interest in rooibos is focused on its powerful antioxidants, especially a rare compound called aspalathin. Aspalathin is a flavonoid found in significant amounts only in the rooibos plant. Antioxidants are vital because they help protect the body's cells from damage caused by unstable molecules called free radicals. This cellular damage, known as oxidative stress, is linked to inflammation and various chronic diseases, including heart conditions. Research suggests aspalathin may have antidiabetic potential and could help protect blood vessels from inflammation linked to high blood sugar levels, a major concern for cardiovascular health. While red rooibos contains these compounds, the unfermented green rooibos boasts a much higher concentration of aspalathin.
What the Science Says So Far
It's important to approach the health claims with a balanced view, as much of the research is still emerging. However, some human studies have shown promising results. A notable clinical trial involving 40 adults at risk for cardiovascular disease found that drinking six cups of rooibos daily for six weeks significantly improved their lipid profiles. Specifically, it lowered levels of 'bad' LDL cholesterol and triglycerides while increasing 'good' HDL cholesterol. Another study suggested that rooibos may act as a natural angiotensin-converting enzyme (ACE) inhibitor, similar to how some blood pressure medications work, by helping to relax blood vessels. However, a 2023 review of 18 human studies concluded that while some results on lipid profiles and antioxidant status are positive, the evidence is not yet sufficient to make broad health recommendations due to variations in study design and the small number of participants. More robust research, including larger and longer-term trials, is needed to confirm these effects definitively.
How to Brew the Perfect Cup
One of the best things about rooibos is how easy and forgiving it is to prepare. Unlike green tea, which can become bitter if over-steeped, rooibos has very low tannin levels, so you can infuse it for a long time to get a richer flavour. For a hot brew, simply use one to two teaspoons of loose-leaf rooibos or one teabag per cup. Pour boiling water over the leaves and let it steep for at least 5 to 7 minutes, though longer is fine if you prefer a stronger taste. It's delicious on its own but also pairs well with a slice of lemon, a dash of honey, or a splash of milk. For a refreshing iced tea, brew it strong, let it cool, and pour over ice, or simply cold brew it in a pitcher of water in the fridge overnight.
