I've never heard that they do. Are you scared if it DOES have an expiration date? How would it not having an expiration date make you feel better?
It will go bad in short time. That's the beauty of DIY.

 

They have a code on the bottom of every box, but I have no idea if it says something about the date. You could e-mail them about that, maybe the code is similar to the Clinique/Estee Lauder manufacture date system.

 

I emailed the company and they told me there is no exp date. Odd and they also don't tell you when it was manufactured. A member on MUA states that the C+E ferulic is good for a month once it's opened.

 

Skinceuticals is more stable then, their 15 AOX+ is hasn't changed color after more then 3 months.