- What It’s Used In: Dry Cleaning
- Problems Caused: Cancer, Central Nervous System Depressant
This is actually one of the few dangerous ingredients on our list known mostly for how harmful it is to humans than what it assists us with. While it is often used in dry cleaning products, we now don’t see it used nearly as much. The International Agency for Research on Cancer classifies it as a Group 2A Carcinogen. Tetrachloroethylene is mostly known as a central nervous system depressant, which is alone is enough to dislike its use. But it also dissolves fats from the skin, causing skin irritation. Due to issues surrounding it, the National Institutes of Health has several health and safety guidelines for its use.