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Polygonum Aviculare Extract

Also-called-like-this: Knotgrass Extract, Elix-IR
What-it-does: antioxidant, emollient


A flavonoid-rich plant extract coming from knotgrass that is claimed to protect the skin from both UV and Infrared damage.  By now it's pretty well-known that UV-light is the number one external skin-aging factor, however, *sigh* it looks like UV is not the only kind of light that causes bad things to happen to the skin.

Infrared light (760 nm to 1 mm) is the spectral band above visible light and there is some research concluding that it can accelerate skin aging via multiple mechanisms, one of them being the stimulation of the production of evil collagen-destroying enzymes called matrix metalloproteinases (MMP).

Therefore, protecting the skin from infrared light is probably a meaningful thing to do even though there are currently no proven ways to do so. As for Knotgrass Extract, we only have the manufacturer's claim that says it can inhibit Cathepsin G, an enzyme involved in photoaging and thus modulating the origin of sun and infrared induced MMP production.

The manufacturer also did in-vivo tests to show that a 2% Elix-IR lotion, used twice a day for 28 days can increase skin firmness (by 11.9%) and elasticity (by 4.8%) and visibly reduce the appearance of wrinkles (by 20%) and smoothes the surface of the skin.

Show me some proof

  • Cho, Soyun, et al. "Effects of infrared radiation and heat on human skin aging in vivo." Journal of Investigative Dermatology Symposium Proceedings. Vol. 14. No. 1. Elsevier, 2009.

Products with Polygonum Aviculare Extract

Hey Honey 911 Pro Gel MUKTI Vitamin Booster Vital C Elixir LILAH B. Aglow™ Face Mist Kristina Holey + Marie Veronique Soothing B3 Serum Kristina Holey + Marie Veronique Intensive Repair Serum DRMTLGY Universal Tinted Moisturizer Spf 46 Live Clean Face Mineral Sunscreen Spf 45 Oumere UV-R SkinMedica Essential Defense Everyday Clear Broad Spectrum Spf 47 Your Best Face (YBF-Skincare) Nourish Eye Cream NIOD Survival 0 SkinMedica Neck Correct Cream DRMTLGY Broad Spectrum Spf 45 DRMTLGY Universal Tinted Moisturizer Spf 46 Live Clean Baby Mineral Sunscreen Spf 45 SkinMedica Lumivive Algotherm Crème De Vie Marine Beverly Hills MD Repair + Reverse Daily Serum™ Noreva Bergasol Expert 50+ Fluid Cream Invisible Finish Skin Medica Skinmedica Total Defense + Repair Spf 50 Water-Resistant SkinMedica SKINMEDICA TOTAL DEFENSE AND REPAIR SPF 34 Kristina Holey + Marie Veronique Barrier Restore Serum Smith Total Sunscreen Spf50+ Pa+++ AlumierMD Moisture Matte Broad Spectrum Sunscreen Spf 40 Bandi Pre-D3 Advanced Moisturising Cream Spf 50 Go-To Zincredible Spf15 Tinted NIOD Survival 10 Noreva Bergasol Expert 50+ Cream - Invisible Finish Very High Protection RoC Multi Correxion Revive + Glow Daily Serum Alba Botanica Sport Mineral Sunscreen Fragrance Free Lotion Spf 45 Alba Botanica Sport Mineral Sunscreen Spf 45 Biologique Recherche Sérum Matriciel Visage Go-To Zincredible Spf15 (Untinted) Suncros Sunscreen Beauty Counter Touchup Skin Concealer Pen Jafra Revitalize Gentle Cleansing Milk Jurlique UV Defence Lotion Spf50 NIOD Survival 20 NIOD Survival SPF 30 Estée Lauder Resilience Multi-Effect Tri-Peptide Face And Neck Creme SPF 15 MAKE Beauty Succulent Skin Gel Darphin Ideal Resource Restorative Bright Eye Cream Equilibra Aloe Crema Solare Viso Spf 50+ Sundaze C-Shells Spf 30 Trufora Day Serum 85 Coola Full Spectrum 360° Sun Silk Drops Organic Face Sunscreen Spf 30 Ava Isa Pure Untinted Ultra Matte Spf 45 Sunscreen Chame Watery Gentle Uv Shield Spf50+ Pa++++ Coola Organic Spf 30 Full Spectrum 360° Sun Silk Drops Dermaction plus by watsons Water Drop Cream