Best For Skin Types
All, Dry, Sensitive
Addresses
Usage Frequency
Daily
What Is Stevia Rebaudiana Leaf Extract?
Stevia rebaudiana leaf extract is derived from the leaves of the stevia plant, native to South America. The extract is typically produced through aqueous, ethanolic, or glycol-based methods, each yielding different concentrations of active compounds. In skincare formulations, it functions primarily as a skin conditioning agent and emollient.
The extract contains polyphenols, flavonoids, and proteins that contribute to its biological activity. The specific composition varies depending on the extraction method used, with glycol-aqueous extracts generally containing higher levels of beneficial polyphenolic compounds such as ferulic and rosmarinic acid derivatives.
How It Works
Stevia leaf extract conditions the skin through emollient action, forming a protective layer that reduces transepidermal water loss. This helps maintain skin hydration and suppleness over time.
The antioxidant activity comes from its polyphenolic and flavonoid constituents, which can neutralise free radicals in laboratory assays. However, the extent to which these compounds penetrate and function effectively within the skin barrier in real-world skincare use remains an area where evidence is still developing.
Clinical Evidence & References
Laboratory studies show that stevia leaf extracts—particularly those prepared using glycol-aqueous or ethanolic methods—demonstrate significant antioxidant activity against DPPH and ABTS free radical models. The extracts are also rich in polyphenols including ferulic and rosmarinic acids, compounds known to have antioxidant potential.
However, most published evidence comes from in-vitro (test tube) research rather than clinical trials on human skin. In-vivo studies specifically evaluating the skincare benefits of stevia extract in formulated products are limited, so claims about its efficacy should be viewed as provisional pending further research.
How to Use
Stevia leaf extract is typically incorporated into serums, creams, and moisturisers as part of a broader formulation. It works well in combination with other conditioning and antioxidant ingredients. Use as directed by your product's instructions, generally as part of your daily skincare routine alongside a broad-spectrum sunscreen for optimal antioxidant protection.
Safety & Precautions
Frequently Asked Questions
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