What a 1/5 rating means
On the comedogenic scale, a 1 sits at the safe end of the scale — clogging is unlikely for most people. That places Glyceryl Stearate in the range most people, including many with acne-prone skin, tolerate well.
One thing the number cannot tell you is concentration. Ingredients are listed in descending order, so Glyceryl Stearate near the end of a label is present in tiny amounts and matters far less than the same ingredient near the top.
About Glyceryl Stearate
It is an emulsifier, the ingredient that keeps a product's oil and water phases from separating. The plain (non-self-emulsifying) grade is a gentle, low-risk emulsifier at 1/5, though it is a stearic-acid ester and so is often avoided in strict fungal-acne routines.
On a label it can read as Glyceryl Stearate, Glyceryl Stearate Nse, Glyceryl Monostearate — worth knowing when you scan an ingredient deck.
Glyceryl Stearate in makeup and skincare
It quietly stabilises most cream foundations, lotions, and moisturisers. Its irritancy is rated separately at 0/5, which is low.
If you deal with fungal acne (malassezia folliculitis) rather than ordinary clogged pores, note that Glyceryl Stearate is among the fatty-acid or ester-type ingredients that community sources commonly avoid — a separate concern from its comedogenic score, and one with weaker evidence behind it.