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For informational purposes only — not medical advice. Always consult a dermatologist for skin concerns.

Methylchloroisothiazolinone (MCI)

1% line markerAI-analyzed

INCI: МЕТИЛХЛОРИЗОТИАЗОЛИНОН

preservative

What it does

A potent preservative commonly used in rinse-off cosmetic products to inhibit the growth of microorganisms. It is often used in combination with Methylisothiazolinone.

Skin Concerns

May aggravate

sensitivityeczemarosacea

Safety & Science

Safety summary

Known to be a sensitizer, especially in leave-on products, and its use is restricted to rinse-off products at very low concentrations in many regions.

1% line marker

This ingredient is commonly used as a marker to identify where ingredients drop below 1% concentration on the label.

Found In Products

Related Ingredients

At a Glance

INCI Name: МЕТИЛХЛОРИЗОТИАЗОЛИНОН
Common Name: Methylchloroisothiazolinone (MCI)
Functions: preservative
Products: 2 products

For informational purposes only. This is not medical advice. Always patch test new products and consult a dermatologist for skin concerns.

Methylchloroisothiazolinone (MCI) — Skincare Ingredient Guide — Dermasift — Dermasift