New Pepper Variety Could Help Manage Blood Sugar Spikes
Seoul, South Korea – A new variety of chili pepper, dubbed ‘Wonki 2,’ developed by researchers at the Rural Development Administration (RDA) in South Korea, is showing promise in helping to manage post-meal blood sugar levels. The innovation centers around the pepper’s leaves, which contain a significantly higher concentration of alpha-glucosidase inhibitors (AGIs) than traditional chili peppers, potentially offering a natural approach to blood sugar control. The RDA announced the expanded commercialization of ‘Wonki 2’ on March 4, 2026, with several companies already incorporating the pepper leaves into a range of food products.
For years, chili pepper leaves have been recognized in traditional medicine for their potential to mitigate blood sugar spikes after meals. This effect is attributed to AGIs, compounds that inhibit the breakdown and absorption of carbohydrates in the small intestine. AGIs are also found in pharmaceutical treatments for type 2 diabetes, highlighting their established role in glucose management. Recognizing this potential, the RDA initiated a comprehensive analysis of over 850 chili pepper genetic resources starting in 2005, ultimately leading to the development of ‘Wonki 2’ in 2020.
‘Wonki 2’ Demonstrates Enhanced Blood Sugar Control
According to the RDA, ‘Wonki 2’ pepper leaves exhibit an AGI activity level of 74.8%, which is two to five times higher than that of common chili pepper leaves. Kim Dae-hyun, head of the National Horticultural Research Institute at the RDA, stated that the AGI content in ‘Wonki 2’ is comparable to that of acarbose (80.2%), a commonly prescribed medication for managing blood sugar levels. Busan.com reported on these findings, detailing the extensive research conducted by the RDA.
Animal studies further support these findings. An eight-week study involving diabetic mice showed significant improvements across 11 diabetes-related indicators. Specifically, fasting blood glucose levels decreased by 13%, plasma insulin concentrations dropped by 24%, and insulin resistance index (QUICKI) increased by 3.8%. These results suggest that ‘Wonki 2’ pepper leaves could offer a substantial benefit in managing key metabolic parameters associated with diabetes. The RDA has completed both breed protection registration and patent registration for ‘Wonki 2’.
From Farm to Table: Expanding Commercial Applications
The RDA is actively working to expand the commercialization of ‘Wonki 2’ through several key initiatives. These include supporting pilot cultivation programs with local agricultural technology centers, establishing contracts with private seed companies, and transferring patent technology to food processing companies. To date, eight companies have secured licenses for the ‘Wonki 2’ variety, and eight others have licensed the patented technology. Yonhap News Agency reports that these companies are already producing over ten processed food products incorporating ‘Wonki 2’ pepper leaves, including teas, powders, noodles, tofu, and snacks.
A key advantage of ‘Wonki 2’ is the stability of its blood sugar-regulating properties even under high-temperature and dry processing conditions, making it suitable for a wide range of food applications. This versatility is expected to drive further innovation in the food industry and provide consumers with more options for incorporating this functional ingredient into their diets. The RDA is also emphasizing the potential for ‘Wonki 2’ to revitalize the chili pepper industry, offering new economic opportunities for farmers.
The Science Behind Alpha-Glucosidase Inhibitors
Alpha-glucosidase inhibitors (AGIs) work by slowing down the digestion of carbohydrates. This delayed digestion results in a more gradual release of glucose into the bloodstream, preventing the sharp spikes in blood sugar that can be detrimental to health, particularly for individuals with diabetes or insulin resistance. AGIs are a recognized therapeutic approach for managing type 2 diabetes, and their inclusion in dietary sources like ‘Wonki 2’ pepper leaves offers a potentially accessible and natural way to support healthy blood sugar levels.
Kim Dae-hyun emphasized that ‘Wonki 2’ represents a significant step forward in combining agricultural research with public health benefits. “Wonki 2 is the result of research that rediscovered the value of chili pepper leaves, considering both public health and farmer income,” he stated. The RDA plans to continue leveraging digital breeding technologies to develop more functional vegetable varieties that meet consumer demands and contribute to a healthier population.
The RDA’s commitment to expanding research in this area is expected to yield further advancements in functional food development. The agency is actively exploring ways to optimize cultivation practices and enhance the AGI content of ‘Wonki 2’ through ongoing breeding programs. The long-term goal is to make ‘Wonki 2’ a widely available and affordable ingredient for consumers seeking to proactively manage their blood sugar levels.
The next step in the rollout of ‘Wonki 2’ will be the continued expansion of pilot programs with local agricultural centers, providing farmers with the resources and training needed to successfully cultivate the new variety. The RDA will also be closely monitoring consumer feedback on the initial range of ‘Wonki 2’ products to inform future product development and marketing strategies.
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