The Health Benefits of Rooibos Tea: What Science Says

Beyond the Cup: What Makes Rooibos Special

Rooibos (Aspalathus linearis) has been consumed in South Africa for centuries, long before it became a trendy café ingredient. The indigenous Khoisan people of the Cederberg region were the first to harvest and brew it, valuing it for both its taste and its perceived healing properties.

Today, science is catching up with tradition. A growing body of research has explored the bioactive compounds in rooibos and their potential effects on human health. Here's what we know — and what we're still learning.

Rich in Unique Antioxidants

Rooibos contains several powerful antioxidants, including two that are particularly noteworthy:

Aspalathin — found almost exclusively in rooibos, this flavonoid has shown significant antioxidant activity in laboratory studies. Research published in the Journal of Agricultural and Food Chemistry found that aspalathin can help protect cells from oxidative stress, which is linked to ageing and chronic disease.

Nothofagin — another flavonoid unique to rooibos, nothofagin works alongside aspalathin to combat free radicals. A 2019 review in Molecules highlighted its potential anti-inflammatory and cardioprotective properties.

What This Means in Practice

Antioxidants help neutralise free radicals — unstable molecules that can damage cells over time. While the body produces its own antioxidants, dietary sources provide additional support. Rooibos offers a caffeine-free way to boost your daily antioxidant intake without the jitteriness of green tea or the acidity of coffee.

Heart Health and Cardiovascular Support

Several studies have examined rooibos's effects on cardiovascular health markers:

A 2011 study published in the Journal of Ethnopharmacology found that adults who drank six cups of rooibos daily for six weeks showed significant improvements in their lipid profiles — specifically, reduced LDL ("bad") cholesterol and triglycerides, while HDL ("good") cholesterol increased.

Research from Stellenbosch University has also shown that aspalathin may help inhibit the enzyme ACE (angiotensin-converting enzyme), which plays a role in regulating blood pressure. This is the same mechanism targeted by common blood pressure medications, though the effect from rooibos tea is considerably milder.

The Bigger Picture

These findings are promising but preliminary. Most studies have been small-scale, and the effects are modest compared to pharmaceutical interventions. Rooibos isn't a replacement for heart medication — but as part of a balanced diet, it may contribute to cardiovascular wellness.

Blood Sugar Regulation

Aspalathin has attracted particular attention for its potential effects on blood sugar metabolism. A study in Phytomedicine demonstrated that aspalathin could improve glucose uptake and insulin secretion in laboratory models.

Animal studies from the South African Medical Research Council have shown that rooibos extract can help reduce blood sugar spikes after meals and improve insulin sensitivity. Human clinical trials are still limited, but the early evidence is encouraging enough that several research groups are pursuing larger studies.

For people managing blood sugar levels — or simply looking to reduce the metabolic impact of their daily beverages — rooibos offers an interesting caffeine-free option that won't spike glucose the way sweetened coffees and energy drinks can.

Bone Health

A lesser-known benefit of rooibos involves bone health. Rooibos contains several minerals important for bone density, including manganese, calcium, and fluoride.

Research published in the Journal of Food Science identified that certain polyphenols in rooibos — including orientin and luteolin — may promote osteoblast activity (the cells responsible for building new bone) while inhibiting osteoclast activity (the cells that break bone down).

This is particularly relevant for:

• Post-menopausal women at higher risk for osteoporosis
• Older adults looking to maintain bone density
• Anyone who has replaced dairy-heavy coffee drinks with plant-based alternatives

Skin Health and Anti-Ageing

Rooibos has long been used topically in South Africa for skin conditions, and modern research is beginning to validate this traditional use.

The antioxidants in rooibos — particularly aspalathin and nothofagin — have demonstrated protective effects against UV-induced skin damage in laboratory studies. A 2015 paper in Mutation Research found that rooibos extracts could reduce DNA damage caused by ultraviolet radiation.

Alpha-hydroxy acids naturally present in rooibos are also used in skincare products. Drinking rooibos regularly provides these compounds from the inside out, potentially supporting skin elasticity and reducing oxidative damage over time.

Digestive Comfort

Rooibos is naturally low in tannins — the compounds in regular tea and coffee that can cause stomach upset, especially on an empty stomach. This makes rooibos gentler on the digestive system.

Additionally, rooibos contains several antispasmodic compounds that may help ease digestive cramping. South African parents have traditionally given diluted rooibos to infants with colic — a practice that, while anecdotal, speaks to its gentle nature.

The absence of caffeine is another digestive advantage. Caffeine stimulates gastric acid production, which can aggravate conditions like acid reflux and gastritis. Rooibos provides none of that stimulation, making it suitable for people with sensitive stomachs.

Naturally Caffeine-Free (Not Decaffeinated)

This distinction matters more than most people realise. Decaffeinated coffee and tea go through chemical or water-based processes to remove caffeine, but trace amounts always remain (typically 2–15mg per cup). The decaffeination process can also alter the flavour and strip away beneficial compounds.

Rooibos is inherently caffeine-free. The Aspalathus linearis plant simply doesn't produce caffeine, which means:

• Zero caffeine, guaranteed — not "up to 97% removed"
• No chemical processing to strip caffeine
• All beneficial compounds remain intact
• Safe at any time of day, for any person, at any life stage

What the Science Doesn't Say (Yet)

Honesty matters here. While the research on rooibos is promising, much of it comes from in vitro (test tube) and animal studies. Human clinical trials are still relatively few, and the ones that exist tend to be small.

We can't say rooibos "cures" or "prevents" anything. What we can say is that it contains bioactive compounds with demonstrated health-relevant properties, and that drinking it regularly is a pleasant, risk-free way to add those compounds to your diet.

The research landscape is expanding. Several South African universities are running larger human trials, and interest from European and Asian researchers is growing. We'll update this article as significant new findings emerge.

Making Rooibos Part of Your Routine

Whether you brew it as a traditional cup of tea or pull it as an espresso shot through your machine, the health compounds are present in both preparations. Espresso-style brewing may actually extract higher concentrations of certain antioxidants due to the pressure and temperature involved, though comparative studies are still limited.

At Rooibrew, we grind our rooibos specifically for espresso extraction — which means you get the health benefits of rooibos in a form that fits the modern coffee ritual. A daily Rooibrew shot or red latte is a simple, enjoyable way to incorporate these compounds into your routine.

The science is still writing the full story of rooibos. But what we know so far suggests that this humble South African plant has a lot more to offer than just a nice cup of tea.