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What-it-does: preservative

Official CosIng Information


This totally unpronounceable ingredient (let’s take a shortcut: MCI) is a super effective preservative with both antibacterial and antifungal effects that works at very low concentrations. 

The bad news with it though is that it can sensitize the skin easily (it’s a so-called non-fragrance allergen). It’s not permitted to be used alone, but only with its BFF, methylisothiazolinone (MI), another icky preservative. Together they have a broad spectrum antimicrobial effect but are permitted to be used only in rinse-off products (under 0.0015%).

Products with Methylchloroisothiazolinone

Dove Go Fresh Face Cleanser Bruno Vassari Extra Rich Cleansing Foam Cotton Tree Baby Wipes Non Parfum Skin doctors Instant Eyelift Dermotivin Original SSCPL Herbals Detan Face Pack G&G teint uniforme Lightening Beauty Oil Living proof No Frizz Conditioner Montarbo Skincare Advanced Exfoliating Cleanser V05 Detox With Micellar Water Purifying Shampoo Aesop Purifying Facial Cream Cleanser Bruno Vassari Scrub & Mask Dr. C. Tuna Tea Tree Series Face Wash MBH DERMACARE Oil Control Acne Cleanser Natio Pore Unclogging Face Scrub Schauma 7 Трав Smartly Unscented Gentle Facial Cleanser Softsoap Crisp Clean Antibacterial Liquid Hand Soap Aesop Amazing Face Cleanser Asepxia Acne Facial Cleanser Dr Sebagh Serum Repair Dr. Teal's Shea Butter & Almond Oil Body Wash Himalaya Herbals Purifying Neem Foaming Face Wash Skin B5 Acne Control Cleansing Mousse Suave Ocean Breeze Shampoo Clarins Pure Melt Cleansing Gel Herbal Essences Hello Hydration Moisturizing Conditioner With Coconut Essences Himalaya Herbals Puryfing Neem Face Wash Joelle Ciocco Lotion Lactee/Perfecting Lotion Lotus Herbals Safe Sun Uv Screen Matte Gel With Spf 50 TRESemmé Botanique Nourish + Replenish With Coconut Milk & Aloe Vera Conditioner Aesop Fabulous Face Cleanser Derma Essentia Anti Dandruff Shampoo John Frieda Luxurious Volume Core Restore Protein-Infused Clear Conditioner Pantene Daily Moisture Renewal Conditioner Aunt Jackie's Don'T Shrink Flaxseed Elongating Curling Gel Aussie Deep Treatment 3 Minute Miracle Moist Dr. Medica Dermatological Anti-Acne Cleanser Echosline Color Up Regenerating Color Mask Formula 10.0.6 Best Face Forward Daily Foaming Cleanser Freeman beauty Cleansing Apple Cider Vinegar Clay Mask + Scrub Freeman beauty Detoxifying Charcoal + Black Sugar Frieda FRIZZ EASE Miraculous Recovery Deep Conditioner Head & Shoulders Classic Clean Shampoo Head and Shoulders Green Apple Anti- Dandruff Shampoo Olay Professional Prox Anti-Aging Exfoliating Renewal Facial Cleanser Pantene Pro V Full & Strong Shampoo Perricone MD Citrus Brightening Cleanser Perricone MD High Potency Classics Nutritive Cleanser Pureen Baby Head To Toe Wash With Pro-Vitamin B5 & Vitamin E