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Diazolidinyl Urea

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What-it-does: preservative

Details

An antimicrobial preservative that helps your products not to go wrong too quickly. It works especially well against bacteria, specifically gram-negative species, yeast, and mold.

Somewhat controversial, it belongs to an infamous family of formaldehyde-releasers. That is, it slowly breaks down to form formaldehyde when it is added to a formula. We have written more about formaldehyde-releasing preservatives and the concerns around them at Dmdm Hydantoin, but do not get too scared, those are more theories than proven facts.

As for Diazolidinyl Urea itself, a study from 1990 writes that at concentrations up to 0.4%, it was a mild cumulative skin irritant, but the CIR (Cosmetic Ingredient Review) reviewed it in 2006 and found that, in concentrations of <0.5%, it is safe as used, as the amount of formaldehyde released will be smaller than the recommended limit (of less than 0.2%).

All in all, it is up to your personal decision and skin sensitivity. 

Show me some proof

  • Liebert, M. A. "Final report on the safety assessment of diazolidinyl urea." J. Am. Coll. Toxicol 9 (1990): 229-245.

Products with Diazolidinyl Urea

Forever Aloe Ever-Shield Deodorant Stick Laca Loción Con Adn Marino Spatagonia Agua Termal Thursday Plantation Aloe Vera Gel iNova Pharmaceuticals ReTrieve Cream with Tretinoin Idraet Serum Hialuronico Metrin Reactivating Gel Monu Gentle Toner Monu Rosewood Reviving Mist Natural Concepts Aloe Post Wax Skin Soother Needs Face Água Micelar OXY Emergency Wash PROSACEA Medicated Rosacea Gel SunSense Anti-Ageing Face Spf 50+ Sunscreen Tiger balm Neck & Shoulder Rub Urisec 22% Urea Cream standard. Lactic Acid 5% Toner With Aha Toner CULLUN Tropical Bio-Toning Essence Celuflex AR Serum De Alta Potencia Derma V10 Stimulating Eye Roll On With Caffeine DermaVix Anti Aging Formula HydroSkinCare Ha² Serum Lagos Celluflex C Serum Alta Potencia Lidherma Fórmula jabón liquido Luron Soothing Aloe Vera Gel Monu Clarifying Toner OXY Deep Pore Acne Vanishing Treatment Skin V.2.0 Niacinamide Serum SunSense Anti-Ageing Face Violetta Good Night Bimaio Serum Hialurónico Puro Cathy Doll Toner Essence Caviahue Serum C Dermaglin Refreshing Peeling Mask Dr. Sensitive Intensive Glutathione Glow Serum Erha X Aqua Re-Fresh Hydrating Face Mist Idraet Glycolic Acid Peel Idraet Mousse Cleanser Idraet Vitamin C Night Serum JAN MARINI Skin Zyme Face Mask Kaya Purifying Toner Laca Bruma Equilibrante Laca Gel De Limpieza Protector Laca Gel Fortalecedor Con Biotina Lagos Celluflex H High Potency Serum / De Alta Potencia MELAO B3 Serum Mannine Health Benethelium Hydrolic Acid And Beta-glucan Mario Badescu Hair Rinsing Conditioner Siluma Micellar Water Stephanie Beaute Aftershave Freshness Gel Sandalwood