All Ingredients
32

Methylchloroisothiazolinone

High Concern

Quick verdict

High concern

Methylchloroisothiazolinone skin safety dashboard

Methylchloroisothiazolinone scores 32/100 across 1 product analyses. The most important acne and irritation checks are summarized first.

Comedogenic rating

5/5

High pore-clogging risk signal for acne-prone skin.

Fungal acne concern

Higher

Review the full formula before using on Malassezia-prone skin.

Pregnancy concern

Review

Ask a clinician before using during pregnancy or nursing.

Skin types to avoid

Acne-prone, Oily, Sensitive

Based on pore-clogging and irritation risk signals.

What is Methylchloroisothiazolinone and why is it used?

We're still generating a detailed description for Methylchloroisothiazolinone. Check back shortly - or scan a product containing this ingredient to speed things up.

Will Methylchloroisothiazolinone clog my pores? (Comedogenic Rating)

Comedogenic Risk: 5/5

Methylchloroisothiazolinone has an estimated comedogenic risk of 5/5 based on GlowLens ingredient scoring across 1 product analyses. A higher number signals a stronger pore-clogging tendency for acne-prone skin. This is informational, not medical advice.

Known Side Effects and Allergies: how concerning is Methylchloroisothiazolinone?

High Concern

Methylchloroisothiazolinone currently scores 32/100, which places it in a higher-concern band overall. The main practical consideration is skin irritation, sensitivity, or breakouts in formulas where it appears alongside other potentially irritating ingredients. This is informational, not medical advice.

Is Methylchloroisothiazolinone safe for pregnancy?

While our analysis gives Methylchloroisothiazolinone a safety score of 32/100 with a high concern level, we recommend consulting your healthcare provider about any cosmetic ingredients during pregnancy or nursing. GlowLens provides general safety assessments - pregnancy-specific advice should come from your doctor or midwife.

Final Verdict: who should be most cautious with Methylchloroisothiazolinone?

Acne-prone, oily, and reactive skin types may want to be more cautious with Methylchloroisothiazolinone, since it carries a stronger pore-clogging signal. Other skin types generally have less to weigh. This is informational, not medical advice.

How we rate this ingredient

Rating sourced from official regulatory and scientific databases.Confidence: HighLast reviewed Jun 13, 2026
1 products analyzed containing MethylchloroisothiazolinoneAnalyze a new product

Found in 1 Products

32

Power stick for her

high

A powerful preservative and known contact allergen that can cause significant skin sensitization in some individuals.

Showing all 1 of 1 products

Frequently Asked Questions

What is Methylchloroisothiazolinone and why is it used?
We're still generating a detailed description for Methylchloroisothiazolinone. Check back shortly - or scan a product containing this ingredient to speed things up. Across 1 products in our database, Methylchloroisothiazolinone appears in various formulations. Use our free skincare ingredient checker to see how it interacts with other ingredients in specific products.
Will Methylchloroisothiazolinone clog my pores? (Comedogenic Rating)
Methylchloroisothiazolinone has an estimated comedogenic risk of 5/5 based on GlowLens ingredient scoring across 1 product analyses. A higher number signals a stronger pore-clogging tendency for acne-prone skin. This is informational, not medical advice.
Known Side Effects and Allergies: how concerning is Methylchloroisothiazolinone?
Methylchloroisothiazolinone currently scores 32/100, which places it in a higher-concern band overall. The main practical consideration is skin irritation, sensitivity, or breakouts in formulas where it appears alongside other potentially irritating ingredients. This is informational, not medical advice.
Is Methylchloroisothiazolinone safe for pregnancy?
While our analysis gives Methylchloroisothiazolinone a safety score of 32/100 with a high concern level, we recommend consulting your healthcare provider about any cosmetic ingredients during pregnancy or nursing. GlowLens provides general safety assessments - pregnancy-specific advice should come from your doctor or midwife.
Final Verdict: who should be most cautious with Methylchloroisothiazolinone?
Acne-prone, oily, and reactive skin types may want to be more cautious with Methylchloroisothiazolinone, since it carries a stronger pore-clogging signal. Other skin types generally have less to weigh. This is informational, not medical advice.