Methylisothiazolinone (MI) is a synthetic preservative commonly used in skincare and personal care products to prevent the growth of bacteria and fungi. It is a potent biocide that works by disrupting the cell membrane of microorganisms, preventing them from reproducing and causing contamination. It is synthesized through a chemical process using various starting materials, including chloroacetic acid and methylamine. These starting materials are typically derived from petrochemical sources.

• Effective preservation: Methylisothiazolinone is highly effective in preventing the growth of bacteria and fungi, making it a popular choice for preserving cosmetic products and ensuring their safety for use.

• Wide compatibility: Methylisothiazolinone is compatible with a wide range of cosmetic formulations and ingredients, making it a versatile preservative option for various skincare and personal care products.

• Long-lasting: Methylisothiazolinone is known for its long-lasting effects, which means that a small amount of the preservative can provide protection to the product over an extended period.

However, Methylisothiazolinone has been associated with skin irritation, allergic reactions, and contact dermatitis, particularly in people with sensitive skin. For this reason, some manufacturers have started to use alternative preservatives or reduced the concentration of Methylisothiazolinone in their products. If you have a history of skin sensitivity or allergies, it is advisable to check the ingredient list of your skincare products to avoid any potential adverse reactions.