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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 SSCPL Herbals Detan Face Pack Bruno Vassari Scrub & Mask Natio Pore Unclogging Face Scrub Asepxia Acne Facial Cleanser Dr Sebagh Serum Repair Himalaya Herbals Purifying Neem Foaming Face Wash Skin B5 Acne Control Cleansing Mousse Suave Ocean Breeze Shampoo Clarins Pure Melt Cleansing Gel Himalaya Herbals Puryfing Neem Face Wash Joelle Ciocco Lotion Lactee/Perfecting Lotion Lotus Herbals Safe Sun Uv Screen Matte Gel With Spf 50 Lotus Herbals Safe Sun Uv Screen Matte Gel With Spf 50 And Pa+++ TRESemmé Botanique Nourish + Replenish With Coconut Milk & Aloe Vera Conditioner Aesop Fabulous Face Cleanser 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 Echosline Color Up Regenerating Color Mask 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 tgin Honey Miracle Hair Mask Arctic Fox Hair Color Corine de farme Conditioner Living proof Restore Mask Cocona care Hair Conditioner Freeman beauty Exfoliating Pink Grapefruit Facial Scrub Organic Care Shampoo Dry Nourish Peter Thomas Roth Mega Rich Conditioner SSCPL Herbals Mix Fruit Cleansing Milk Urban Skin Rx Ph Balance All Skin Toner Aesop Purifying Facial Exfoliate Paste Clinique City Block Purifying Charcoal Cleansing Gel Joelle Ciocco Lotion Aromatique/Botanical Lotion Real Techniques Brush Cleansing Gel Aesop Classic Conditioner Aiken Micellar Cleansing Gel For Face & Body Clarins Gentle Foaming Cleanser With Cottonseed "Normal/Combination Skin" Joelle Ciocco Creme Emulsionnante/Gentle Cleansing Cream Joelle Ciocco Eyelisse/Eye Lip Contour Cream MALIN + GOETZ Grapefruit Face Cleanser Obey Your Body Mineraux Purifying Gel Peel Olay Luminous Brightening Cream Cleanser Urban Veda Rose & Botanics Daily Reviving Facial Wash