I've never found another product that has soothed my acne as well as this mask. I can see a huge difference as soon as I wipe the mask off. It almost looks like I don't have acne!
Very perishable and must be kept in the refrigerator. Though this is a great indicator that there are no preservatives, it also means you might not get your moneys worth before it goes bad. It also smells like garlic which is a strange scent for a cosmetic, but it doesn't really bother me especially because of how good the mask is.
I use the "use by" date as more of a guideline. Use your best judgment for when you think your mask has actually gone bad.