No, methylisothiazolinone is not a hormone. It is a preservative and antiseptic used in a variety of consumer products, including cosmetics, personal care products and household cleaners. It is a synthetic chemical that does not occur naturally in the human body.

Hormones are produced by glands in the body and transported to target cells through the bloodstream chemical messenger. They regulate a wide range of bodily functions, including growth, development, metabolism and reproduction.

Methylisothiazolinone is not a hormone and does not have any of the same role. It is a toxic chemical that can cause skin irritation, allergic reactions, and other health problems.