Do chemical peels have expiration dates? I'm looking at bottles and these don't have labels. Do these lose potency over time?

As a general rule for any chemical peels: they do last quite a while but they also lose potency especially after being opened. Make sure to keep the bottles out of sunlight. I toss bottles of peeling solutions that have been in the shelf for a year. Devise a way on labeling your peels.

In addition, make sure that the bottles are sealed tightly. Oxidation reaction occurs every time the peels are exposed to oxygen.

I rather figured they lost some of their potency, but couldn't find it listed anywhere.None of my bottles have expiration dates. One place actually said they were good forever! I also am aware of the sunlight issue and making sure they are closed tightly! I appreciate your reply!