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 Squalane 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 Squalane near the end of a label is present in tiny amounts and matters far less than the same ingredient near the top.
About Squalane
It is a lightweight emollient chosen for slip without heaviness. The stable, hydrogenated form of squalene. Rated 0-1, lightweight, and one of the go-to fungal-acne-safe emollients. Do not confuse with squalene.
Squalane in makeup and skincare
It is a favourite in 'skin-friendly' foundations and lightweight moisturisers. Its irritancy is rated separately at 0/5, which is low.