What Is Steviol Glycosides/Reynoutria Japonica Root Extract?
Steviol Glycosides/Reynoutria Japonica Root Extract is a plant-derived blend that combines roots from Japanese knotweed (Reynoutria japonica) with purified sweet-tasting molecules called steviol glycosides obtained from stevia (Stevia rebaudiana). Japanese knotweed is naturally rich in resveratrol and other phenolic compounds, while stevia roots supply the antioxidant steviol glycosides. The idea of pairing these two came from food science where both plants were already valued for their stability and protective qualities, leading cosmetic chemists to explore the mix for skin care.
To make the ingredient, manufacturers harvest and clean the roots, then dry and grind them into a coarse powder. Each plant is extracted separately in water or a gentle alcohol solution to pull out the active molecules. The steviol glycosides are further isolated and refined through filtration and crystallization. Finally, the knotweed root extract and the steviol glycosides are blended in a specific ratio and standardized so every batch delivers consistent antioxidant power.
You will most often see Steviol Glycosides/Reynoutria Japonica Root Extract in serums, anti-aging creams, day and night moisturizers, sheet masks and soothing after-sun gels. Formulators appreciate its plant-based story and its ability to shield the formula and the skin from everyday oxidative stress.
Steviol Glycosides/Reynoutria Japonica Root Extract’s Cosmetic Benefits/Uses
The main reason brands add this ingredient is its strong antioxidant activity, which helps protect both the product and the skin from free radical damage triggered by UV light and pollution. This support can translate into a brighter, more even-toned complexion and may slow the appearance of fine lines linked to environmental stress.
Who Can Use Steviol Glycosides/Reynoutria Japonica Root Extract
This antioxidant blend is gentle enough for most skin types, from oily to dry and even sensitive, because it is water based and free of heavy oils or known irritants. Very reactive or highly sensitised skin should still go slow at first, simply because any new botanical can be unpredictable on such skin.
The ingredient is plant derived with no animal by-products, so it fits vegan and vegetarian lifestyles.
Current research and traditional use give no reason for concern during pregnancy or while breastfeeding, yet safety data are limited. This is not medical advice and anyone who is pregnant or nursing should check with a doctor before adding new skincare.
It does not make skin more prone to sunburn and is classified as non photosensitising. Standard daytime sunscreen habits are still encouraged for overall skin health.
Potential Side Effects/Adverse Reactions
Responses to topical Steviol Glycosides/Reynoutria Japonica Root Extract differ from person to person. The points below outline potential, though uncommon, reactions when the ingredient is used in a properly formulated product.
- Mild redness or stinging, usually short lived
- Dry patches if layered with many other astringent actives
- Allergic contact dermatitis in those sensitive to knotweed or stevia family plants
- Interaction with strong exfoliating acids, possibly heightening overall sensitivity
If any irritation, swelling or rash appears stop using the product and consult a healthcare professional.
Comedogenic Rating
Rating: 0. Steviol Glycosides/Reynoutria Japonica Root Extract is a lightweight water soluble antioxidant blend with no fatty acids or films that could clog pores. It sits on the skin surface, neutralises free radicals and then rinses away or absorbs without leaving residue, making it highly unlikely to block follicles.
Because of this non clogging profile it is generally suitable for acne-prone or breakout-prone skin.
No data suggest it worsens fungal acne or interacts with common acne treatments, but purity of the final formula and the other ingredients paired with it will ultimately determine how pore friendly the finished product is.
Summary
Steviol Glycosides/Reynoutria Japonica Root Extract is mainly used for its antioxidant talent which helps shield skin and the formula from damaging free radicals generated by sunlight and pollution. It achieves this by donating electrons to unstable molecules, essentially calming them before they can harm collagen or trigger dullness.
The blend is still a niche addition in skincare, mostly found in newer clean beauty lines angling for plant powered freshness, so you may not spot it on every shelf yet.
Current safety data show low irritation risk, no photosensitivity and virtually no comedogenicity. As with any new skincare ingredient it is sensible to patch test first to make sure your skin agrees with it.