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.
Quick facts about Bentonite
Safe
0 = won't clog pores · 5 = highly pore-clogging
Low Risk
0 = inert · 5 = often irritating
Thickeners
Generally considered safe
Typically yes
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
Other thickeners to know
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.
Written by ScanSkinAI Team · Last updated May 2026
This information is for educational purposes only. Always patch-test new products and consult a dermatologist if you have specific skin concerns.