Weekend Wondering: What does it mean if a product advertises itself as “oil free”?

In this post, on coco-caprylate caprate, John asks: I see coco-caprylate appearing in a lot of “oil-free” moisturizers. What constitutes an “oil-free” moisturizer? It seems to me a lot of them use oil-derived ingredients anyway.  This is a great question, and the answer really is “I don’t know.” I don’t buy cosmetic products from stores, … Read more