BHT (Butylated Hydroxytolulene)
What is it:
A fat-soluble anti-oxidant and preservative in foods, cosmetics, and industrial compounds.
Why it's a risk:
- When the body metabolizes BHT, it creates free radicals in your body that can create damage to cell's DNA (Source, Source)
- One study found that it works both to promote and inhibit tumors, depending on what other chemicals are present in the body. (Source)
- Is known to be an estrogen mimicker. (Source)
- Is known to penetrate the skin (Source)
- Carries a small risk of skin sensitization or allergic reaction (Source)
Types of products it's in:
Lipstick, eyeshadow, lip gloss, foundation, moisturizers, lip balm
A few brands that use BHT:
Some ingredients I'm kind of on the fence about. This is not one of them. This is definitely an ingredient that I personally avoid, especially because of its risk of being a xenoestrogen, because it's fat soluble, and because it's proven to be absorbed through the skin.