Do enzyme-based cleaners expire or degrade?

I have two cats and thus, I have enzyme cleaners. One is Nature’s Miracle and the other is Mirazyme. I’ve realized both are a couple of years old … but there’s nothing on the label about any expiration or use-by date or anything like that.

Do those enzymes degrade over time or lose their effectiveness?

From the website for Nature’s Miracle, “Our product has a 3 year shelf life. To decipher the lot number you take the first 2 numbers which represent the year it was made and the next 3 are the day of the year. For example: 10113 would mean it was made in April 2010 and is good through April 2013.”

when your cats stop getting clean then it’s time to get some new stuff.