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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 Telepoint family Rose Scented Hand Soap Helena Professional Hair Gel Bruno Vassari Extra Rich Cleansing Foam Cotton Tree Baby Wipes Non Parfum Skin doctors Instant Eyelift St. Botanica Argan Oil Ultra Nourishing Body Wash Caviahue Serum C Dermotivin Original SSCPL Herbals Detan Face Pack G&G teint uniforme Lightening Beauty Oil Oxecure Facial Liquid Cleanser not your mother's Curl Talk Activating Mousse not your mother's Curl Talk Curl Activation Mousse Arvea Gel Aloe Vera Fancy Handy Face Cleansing Foam Rice Oil Geniol Shampoo Argan Living proof No Frizz Conditioner Montarbo Skincare Advanced Exfoliating Cleanser Old Spice Swagger Body Wash Prodermic Mega Tonic Suave Daily Clarifying Conditioner Suave Tropical Coconut Infused With Extract & Vitamin E Conditioner Suave Waterfall Mist Conditioner V05 Detox With Micellar Water Purifying Shampoo Aesop Purifying Facial Cream Cleanser Alluskin Purifying Cleanser Bruno Vassari Scrub & Mask Cat Makeup Lagrimas De Unicórnio Curatio Fash X Face Wash Dr. C. Tuna Tea Tree Series Face Wash Love beauty and planet Coconut Water & Mimosa Flower Conditioner 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 St. Botanica Strawberry and vitamin E nourishing Body Wash TAYLOR OF OLD BOND STREET Sandalwood Shaving Cream Aesop Amazing Face Cleanser Asepxia Acne Facial Cleanser Bali Ixora Aroma Body Lotion Dr Sebagh Serum Repair Dr. Teal's Shea Butter & Almond Oil Body Wash Himalaya Herbals Purifying Neem Foaming Face Wash Ivory Clean Body Wash Natura Conditioner Control De Oleosidad Pears Pure And Gentle Cleansing Face Wash Skin B5 Acne Control Cleansing Mousse Suave Ocean Breeze Shampoo