Rooibos Extract Boosted Sunscreen Performance in Lab Tests
Researchers have demonstrated that adding red rooibos extract to synthetic sunscreens increases UV protection.
Updated on Sept. 28, 2026 in Botany
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Researchers in Malaga, Spain, found that incorporating red rooibos extract into cream bases containing octinoxate and avobenzone significantly improved sun protection performance. This research-stage development improved SPF ratings and stabilized chemical filters against UV degradation in laboratory testing on plastic plates.
Why it matters
The findings suggest that plant-based additives could allow manufacturers to reduce the concentrations of synthetic chemicals in sunscreen products. By leveraging antioxidant properties of fermented leaves, this approach aims to enhance both efficacy and stability in modern formulations.
The red rooibos extract raised the SPF of the base cream from 15.43 to 27.24 at a 2.5% concentration. Additionally, the extract slowed the rate of SPF degradation by 50% compared to the control and increased immune defense protection by 56%.
The players
Rooibos Plant
A South African shrub known for high antioxidant content and its use in traditional infusions and dietary supplements.
The details
Researchers applied sunscreen mixtures to rough-surfaced plastic plates to simulate skin-like textures and used a spectrometer—an instrument that measures the intensity of light—to quantify UV transmission. The study found that fermentation during the processing of rooibos leaves oxidizes specific compounds into forms that more effectively absorb UV radiation. Beyond UV absorption, the extract acted as a stabilizer, preventing the synthetic filters octinoxate and avobenzone from breaking down twice as quickly as they did in the control group.
Timeline
2025: A study identified that skin bacteria break down urocanic acid, which has an SPF of 1.58.
- 2026-09-28
Researchers published findings on the efficacy of rooibos extract in sunscreen formulations.
The Tech Race
This research follows a broader trend in cosmetic science to optimize traditional UV filter performance through natural additives rather than solely relying on increasing synthetic concentrations. It sits within the competitive field of ingredient stabilization, where the search for more durable formulations remains a primary focus.
Consumers cannot yet purchase sunscreens containing these specific rooibos formulations, as the study was restricted to controlled laboratory settings. Future availability remains dependent on further testing to determine if these results translate to safe, effective protection on human skin.
The takeaway
This study demonstrates that botanical extracts can function as stabilizers for synthetic UV filters, potentially allowing for more efficient cream compositions. Future developments will likely involve clinical trials to verify whether these laboratory gains in SPF stability hold true in human subjects.
Further reading
For more on plant-based chemical advancements, explore our latest coverage in Botany.
Source note: This article includes information reported by Earth.
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