What a 3/5 rating means
On the comedogenic scale, a 3 is the moderate midpoint: tolerated by many, a possible trigger for congestion-prone skin. That puts Colloidal Sulfur squarely in the judgement-call zone, where your skin type and the product's formula decide the outcome.
One thing the number cannot tell you is concentration. Ingredients are listed in descending order, so Colloidal Sulfur near the end of a label is present in tiny amounts and matters far less than the same ingredient near the top.
About Colloidal Sulfur
It is an active ingredient included for a specific skin benefit. A traditional acne active that is itself moderately comedogenic (3) and quite irritating (4), so it can be a mixed bag for sensitive skin.
On a label it can read as Colloidal Sulfur, Colloidal Sulphur, Sulfur, Sulphur — worth knowing when you scan an ingredient deck.
Colloidal Sulfur in makeup and skincare
It is formulated into targeted treatments and some makeup-skincare hybrids. Its irritancy is rated separately at 4/5, which is worth noting for sensitive or reactive skin.
Lower-rated alternatives to Colloidal Sulfur
If you want a similar role with a friendlier comedogenic score, consider:
- Squalane — comedogenic rating 1/5 (Low risk).
- Niacinamide — comedogenic rating 0/5 (Low risk).