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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

CTS CHEMICAL INDUSTRIES Ret-Avit Cream 0.05% ASAP Anti-Ageing Night Cream Ortho Dermatologics Altreno (Tretinoin) Lotion, 0.05% Peter Thomas Roth Acne Clearing Wash Valeant Biacna Elizabeth Arden Retinol Ceramide Capsules Hada Labo Unscented Hada Labo Tokyo Anti-Aging Face Mask Avene Deep Moist Lotion CTS CHEMICAL INDUSTRIES Ret-Avit Gel 0.05% Dermacol Make-Up Cover Hada Labo Goku-Jyun Alpha Lifting & Firming Lotion Hado Labo Anti-Aging Hydrator Glysomed Eczema Control Glytone Rejuvenating Mini Peel Gel Love beauty and planet Tropical Hydration Shower Gel Coconut Oil & Ylang Ylang 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 Avon Heavenly Hydration Facial Oil Bioderma Atoderm Lip Balm Catrice Prime And Fine Poreless Blur Primer Dove Go Fresh Face Cleanser Medik8 Retinol 3 Tr Mixa Hyalurogel Light NYX Slip Tease Lip Lacquer RCMA Foundation SEKKISEI MYV Concentrate Oil Simple Replenishing Rich Moisturiser Youth Lab CC Complete Cream SPF 30 AOA Studio Paw Paw:Glow Baby Highlighter-Super Glow Abdiibrahim Acnelyse Beauty Pie Superactive Capsules Pure Double Vitamin C & Vitamin E Serum Carotone Caro Tone Black Spot Corrector Garnier Pure Active Sensitive Anti-Blemish Clarifying Toner Hada Labo Goku-Jyun Alpha Serum Le Labo Bergamote 22 Body Oil Le Labo Iris 39 Body Oil Le Labo Jasmin 17 Body Oil Le Labo Labdanum 18 Body Oil Le Labo Neroli 36 Body Oil Le Labo Oud 27 Body Oil Le Labo Patchouli 24 Body Oil Le Labo Rose 31 Body Oil Le Labo Thé Noir 29 Body Oil Le Labo Vetiver 46 Body Oil Le Labo Ylang 49 Body Oil