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 Hada Labo Goku-Jyun Alpha Lifting & Firming Lotion 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 Medik8 Retinol 3 Tr Mixa Hyalurogel Light RCMA Foundation Beauty Pie Superactive Capsules Pure Double Vitamin C & Vitamin E 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 Gokujun Cleansing Oil Rouses Point Pharmaceuticals Tretinoin Cream 0.025% Avon Planet Spa Radiant Gold Face Mask Tarte Amazonian Clay Full Coverage Airbrush Foundation L'Oreal Paris Elvive Extraordinary Clay Rebalancing Conditioner Neutrogena Ultra Sheer Face & Body Dry Touch Sunscreen Lotion Spf 50 Nivea Lip Butter (Blueberry Blush) QV Lip Balm Avene Triacnéal Expert Fresh Seaberry Moisturizing Facial Oil Hada Labo Tokyo Gentle Hydrating Cleanser L'oreal Age Perfect Micellar Water Mature Skin Neostrata Skin Active Retinol + Nag Complex Vanicream Moisturizing Skin Cream Avene D-Pigment Light Avene Retrinal 0.1 Intensive Cream Ducray Keracnyl Repair Cream Lipidol Cleansing Face Oil Nu Skin Ap-24® Anti-Plaque Fluoride Toothpaste PCA Skin Pigment Gel Safi Oxywhite Pembersih Muka Cerah Sempurna Unguento Gualavit Vichy Neovadiol Magistral Day Cream Avene Cleanance Hydra Soothing Cream BeautyBioscience R45 The Reversal 3-Phase Skin Transforming Treatment Bio-Oil Specialist Skincare Oil Boots Simply Sensitive Eye Make-Up Removal Lotion Dove Go Fresh Cool Moisture Body Wash Emma Hardie Brilliance Facial Oil Hada Labo Gokujyun Face Wash Neutrogena Facial Cleansing Bar Obagi C Fx C-Therapy Night Cream Olay Olay Total Effects 7 In 1 Anti-Aging Moisturiser Spf 15 Sephora Supreme Cleansing Oil Skinfood Black Sugar Mask Wash Off Exfoliator