Science
Mechanism of Action
Trapa japonica peel extract operates on multiple levels to enhance skin health. Its primary actions include potent free radical scavenging and reduction of reactive oxygen species (ROS), providing strong antioxidant protection. It actively contributes to anti-aging by stimulating human dermal fibroblast proliferation, boosting collagen production, and inhibiting matrix metalloproteinases (MMPs) that degrade collagen. Furthermore, the extract demonstrates anti-adipogenic properties by limiting lipid accumulation and ROS during preadipocyte differentiation. It is also noted for its ability to alleviate inflammation, soothe the skin, improve conditions like atopy, regulate sebum secretion, and contribute to skin brightening. Related species also suggest anti-inflammatory, antimicrobial, and tissue regeneration properties conducive to wound healing.
Research
Clinical Evidence
High confidenceN/A
Key findings
- 01 Demonstrated strong dose-dependent antioxidant activities in vitro, achieving 92.4% DPPH radical scavenging at 100 µg/mL (0.01%) and 94.6% ABTS radical scavenging at 1000 µg/mL (0.1%). Initial activity was observed at 10 µg/mL (0.001%).
- 02 Inhibited lipid accumulation and reactive oxygen species production during the differentiation of 3T3-L1 preadipocytes in vitro.
- 03 Trapa japonica fruit extract increased collagen production by 33% at 1 µg/mL (0.0001%) in vitro. A fermented extract (FTJ) further boosted collagen by 63% at the same concentration. A peptide derived from the fermented extract (PEP) applied at 0.5% in an eye cream showed anti-aging effects in an 8-week clinical study, inhibited TNF-α-induced mRNA expression of MMPs, and promoted wound recovery in human keratinocyte (HaCaT) cells.
- 04 Topical application of a 5% w/w methanolic extract ointment of Trapa natans peel significantly enhanced wound contraction by 58.86% on day 20 in an excision wound model in rats.
Transparency
Dusting Analysis
No data suggests this ingredient is commonly 'dusted' or used at ineffective percentages merely for claims.
The Formula
Formulation
Stability
The extract demonstrates good stability across a broad pH range, specifically showing stability at pH 2.5 and 8.5, based on studies with the related Trapa natans L. peel extract. Its composition is versatile, containing both water-soluble phenolic compounds and oil-soluble non-polar constituents like triterpenoids and steroids, with a notable abundance of water-soluble compounds.
Safety
Safety Profile
While not formally reviewed by CIR, SkinSAFE classifies Trapa Japonica (Water Chestnut) Extract as 'Irritant Free', 'Fragrance Free', 'Paraben Free', and safe for sensitive areas including baby and eyelid use. Paula's Choice describes it as 'Generally non-irritating'. Acute toxicity studies on the related Trapa natans peel extract observed no mortality or adverse effects at doses up to 2000 mg/kg in Wistar rats, indicating a favorable safety profile.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Trapa japonica peel extract is a valuable multi-functional ingredient, clinically shown to deliver potent antioxidant and anti-aging benefits, while also offering broad skin compatibility and a favorable safety profile.
Related
Similar Ingredients
Finding similar ingredients…
References
Sources