Thickeners

Bentonite: Comedogenic Rating & Safety Profile

Also known as: Bentonite Clay · Montmorillonite

A volcanic clay that absorbs sebum and impurities. The active ingredient in detoxifying clay masks.

Comedogenic

0/5

Safe

0 = won't clog pores · 5 = highly pore-clogging

Irritancy

1/5

Low Risk

0 = inert · 5 = often irritating

Function

Thickeners

Pregnancy

Generally considered safe

Vegan

Typically yes

Also Known As

Bentonite Clay, Montmorillonite

Quick verdict

Bentonite is a thickener with a safe comedogenic profile (0/5) and low risk irritancy (1/5). A volcanic clay that absorbs sebum and impurities. The active ingredient in detoxifying clay masks.

What is Bentonite?

Bentonite is a volcanic clay made primarily of montmorillonite — a layered silicate mineral that swells dramatically when wet. The negatively charged clay particles attract positively charged impurities and oil from the skin surface, which is why bentonite is the active ingredient in most 'detox' clay masks. It is one of the strongest oil-absorbing clays available.

Comedogenic Rating: What 0/5 Means for Your Skin

Bentonite is rated 0/5 comedogenic. It is a wash-off ingredient that helps clear pores rather than clogging them.

Benefits for skin

Strong oil absorption
Pulls impurities from pores
Calms active breakouts (short term)

Potential side effects & who should avoid it

Bentonite has a 1/5 irritancy rating. The main risk is over-drying — bentonite masks left on too long, or used too frequently, strip natural sebum and damage the skin barrier. Don't let the mask dry to a tight, cracked finish; wash off while still slightly damp.

Best for

Oily
Combination
Acne-prone

Avoid if

Dry skin
Sensitive skin
Eczema

How to use Bentonite safely

Use as a 5–10 minute mask 1–2 times per week. Mix with water just before use (clay activates on contact with moisture). Apply moisturiser and serum afterwards to support the barrier.

Commonly found in

Bentonite is in clay masks, cleansing powders and some powdered cleansers.

Found Bentonite in your skincare?

Paste the full ingredient list into our INCI Analyser to see how this ingredient interacts with everything else in the formula.

Frequently asked questions

Is bentonite comedogenic?

No — 0/5.

Is bentonite safe for sensitive skin?

Use sparingly. Sensitive skin should choose kaolin instead.

Can I use bentonite every day?

No — 1–2 times per week is the maximum for most skin types.

Should I let a bentonite mask dry completely?

No — this is when it pulls moisture from the skin and damages the barrier. Wash off while still slightly damp.

Other thickeners to know

Kaolin

The gentlest cosmetic clay. Mild oil absorption suitable for sensitive and combination skin.

Want the full picture on pore-clogging ingredients? Read our complete guide to comedogenic ingredients for the dermatology research behind the 0–5 scale and the full list of high-risk ingredients to avoid.

Sources

Written by ScanSkinAI Cosmetic Science Team · Last updated June 2026

This information is for educational purposes only. Always patch-test new products and consult a dermatologist if you have specific skin concerns.