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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

Valeant Biacna Elizabeth Arden Retinol Ceramide Capsules Avene Deep Moist Lotion Hada Labo Goku-Jyun Alpha Lifting & Firming Lotion Glysomed Eczema Control Neutrogena Body Oil - Light Sesame Formula SkinCeuticals Retinol 1.0 Maximum Strength Refining Night Cream The Ordinary Retinol 0.2% In Squalane The Ordinary Retinol 0.5% In Squalane The Ordinary Retinol 1% In Squalane Vichy Neovadiol Magistral Elixer Avene Antirougeurs Calm Soothing Repair Mask Dove Go Fresh Face Cleanser Medik8 Retinol 3 Tr Mixa Hyalurogel Light RCMA Foundation Simple Replenishing Rich Moisturiser Abdiibrahim Acnelyse Beauty Pie Superactive Capsules Pure Double Vitamin C & Vitamin E Serum Garnier Pure Active Sensitive Anti-Blemish Clarifying Toner Hada Labo Goku-Jyun Alpha Serum Neutrogena Deep Moisture Night Cream Neutrogena Ultra Sheer Face & Body Stick Sunscreen Spf 70 Revolution Skincare Fine Line Correcting Serum - 0.2% Retinol Rohto Hada Labo Gokujyun Cleansing Oil Rouses Point Pharmaceuticals Tretinoin Cream 0.025% Vivant Skin Care Derm-A-Gel Level 1 Wetcode Night Repair Aqua-Light Ampoule Avene Ysthéal Eye And Lip Contour Care Avon Planet Spa Radiant Gold Face Mask Clear skin by Avon Loción Tónica Facial Astringente Elizabeth Arden Eight Hour® Cream Skin Protectant Fragrance Free Olay Refreshing Gel Cleanser Tarte Amazonian Clay Full Coverage Airbrush Foundation L'Oreal Paris Elvive Extraordinary Clay Rebalancing Conditioner L'oreal Bi-Phase Micellar Water All Skin Types Max Love Batom Gloss Latex Menta Neutrogena Ultra Sheer Face & Body Dry Touch Sunscreen Lotion Spf 50 Nivea Lip Butter (Blueberry Blush) QV Lip Balm Aiken Micellar Cleansing Gel For Face & Body Chanel Le Blanc Targeted Brightening Spot Corrector Txc Fresh Seaberry Moisturizing Facial Oil Fresh Seaberry Skin Nutrition Booster Hada Labo Tokyo Gentle Hydrating Cleanser L'oreal Age Perfect Micellar Water Mature Skin Neostrata Skin Active Retinol + Nag Complex QEI+ Purifying Golden Soap Revolution Fast Base Stick Foundation Vanicream Lite Lotion