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BHT

Also-called-like-this: Butylated Hydroxy Toluene
What-it-does: antioxidant, preservative

Details

It's the acronym for Butylated Hydroxy Toluene. It's a common synthetic antioxidant that's used as a preservative.

There is some controversy around BHT. It's not a new ingredient, it has been used both as a food and cosmetics additive since the 1970s. Plenty of studies tried to examine if it's a carcinogen or not. This Truth in Aging article details the situation and also writes that all these studies examine BHT when taken orally.

As for cosmetics, the CIR (Cosmetic Ingredient Review) concluded that the amount of BHT used in cosmetic products is low (usually around 0.01-0.1%),  it does not penetrate skin far enough to be absorbed into the bloodstream and it is safe to use in cosmetics.

Products with BHT

Theraskin Theracne Barra CTS CHEMICAL INDUSTRIES Ret-Avit Cream 0.05% Cordes Vas July Facial Mask Neutrogena Ultra Sheet Dry Touch Spf 55 Sunmax sensitive fps 50 Vivier Corrector 2 Apostrophe Tretinoin Aveeno Ultra-Light Sensitive Skin Mineral Sunscreen Bath & Body Works White Tea And Ginger Shower Gel Farmax Protetor Solar Sunless Fps 15 GSK Stieva-A Cream Hedge & Hedge Pharmaceutical LLP Tretinoin Cream USP Hollywood By Dr. Rey Anti-Aging Facial Creme L'Oreal Micellar Water Complete Cleanser Normal To Oily Skin Mandom Petroleum Jelly Nizoral Ketoconazole Anti Dandruff Shampoo Ortho Dermatologics Altreno (Tretinoin) Lotion, 0.05% Peter Thomas Roth Acne Clearing Wash Rogaine Hair Regrowth Treatment Shu Uemura Rouge Unlimited Matte Valeant Biacna Value by Midwood Vitamin E Moisturizing Skin Oil 4,000 I.U asap Anti-Ageing Night Cream Bath & Body Works Dark Kiss Body Lotion Bath & Body Works Teakwood 2-In-1 Hair + Body Wash Becca Zero No Pigment Glass Highlighter For Face + Lip Dermage Improve C 10 Sérum Dr. Sheth Moringa & Vitamin C Cleansing Oil Elizabeth Arden Retinol Ceramide Capsules Equate Micellar Water Garnier Micellar Cleansing Water For Dry, Sensitive Skin Hada Labo Unscented Hada Labo Tokyo Anti-Aging Face Mask Mantecorp Epidrat Calm Mensome Retinol Nivea Moisture Sun Lotion Spf 50 OVALE Micellar Cleansing Water Brightening For Acne Skin Obagi Tretinoin Gel Usp 0.05% Vaseline Moisturising Jelly Cocoa Butter Vivier Sunscreen Lotion SPF 30 Votre Peau Bare It All Facial Make Up Remover Avene Deep Moist Lotion Avon Skin So Soft Dry Oil Spray Bath & Body Works Beautiful Day Shower Gel Bath & Body Works Dark Kiss Shower Gel CTS CHEMICAL INDUSTRIES Ret-Avit Gel 0.05% Dermacol Make-Up Cover Garnier Micellar water with vitamin c Good Vibes Radiant Glow Face Serum - Rose Hip Hada Labo Goku-Jyun Alpha Lifting & Firming Lotion