Science
Mechanism of Action
This extract fortifies the skin's natural moisture barrier, effectively preventing trans-epidermal water loss and safeguarding against external aggressors. Its active compounds, primarily steviol glycosides, function as potent humectants, drawing and retaining moisture to deeply hydrate the skin. Beyond hydration, it exhibits retinoid-like activity, fostering skin regeneration by increasing gene expression and stimulating dermal protein synthesis to visibly reduce wrinkles. Rich in phenolic compounds and flavonoids, it delivers robust antioxidant protection, combats oxidative stress, and calms inflammation, while its natural steroid alcohols provide astringent action, helping to refine pores and regulate oil production. It also supports improved skin cell activity, boosts elasticity, prevents wrinkle formation, and can help to lighten hyperpigmentation, contributing to a more even and youthful complexion.
Research
Clinical Evidence
High confidence5%
Key findings
- 01 In a gel formulation, demonstrated a significant improvement in skin hydration by 20% after 28 days and 24% after 14 days compared to untreated skin. Its moisturizing effect was observed to be three times more potent than glycerin.
- 02 A cream formulation at 5% concentration was most effective in preserving dermal collagen and preventing degradation induced by UVB exposure in male Wistar rats, with 2.5% also showing protective benefits. In a human clinical trial, a 5% stevia gel applied for 21 days visibly enhanced skin hydration, brightness, and smoothness, while also reducing the appearance of fine wrinkles and mild acne.
Transparency
Dusting Analysis
Clinical studies demonstrate measurable efficacy at concentrations as low as 1% for hydration benefits, and up to 5% for comprehensive anti-aging and protective effects, indicating that it is typically incorporated at active levels rather than solely for 'dusting' purposes.
The Formula
Formulation
Stability
Stevia Rebaudiana Leaf/Stem Extract exhibits robust pH stability, with extracts typically processed and remaining stable across a pH range of 5.5 to 7.5. It also demonstrates excellent heat stability, facilitating its incorporation into various heated formulations.
Safety
Safety Profile
While the Cosmetic Ingredient Review (CIR) has not specifically reviewed this ingredient, high-purity steviol glycosides are FDA Generally Recognized As Safe (GRAS) for food use. For cosmetic applications, it is generally regarded as highly safe, with no reported side effects or allergies. SkinSAFE categorizes it as 'Teen SAFE', 'Baby SAFE', 'Eyelid SAFE', and 'Irritant Free'. Although some in vitro studies suggested potential cytotoxicity and irritation from high concentrations of certain ethanolic and glycol-aqueous extracts, topical formulations at 2.5% and 5% have been proven safe and non-toxic in both animal and human studies, inducing no skin irritation.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Stevia Rebaudiana Leaf/Stem Extract is a valuable, multi-functional ingredient offering significant clinical benefits in hydration, anti-aging, and skin barrier health with a strong safety profile across all skin types.
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