Chemical inventory

I was wondering what everyone is doing for monitoring their chemical inventory. Not sure if this is only applicable to food-contact chemicals, sanitizers, hazardous chemicals or all chemicals used in Production? 

Insights appreciated

I do an annual inventory on all chemicals, and keep a registry based on that. Some people are going to come in here and say that's not often enough but read your code and do your risk analysis and you determine if it's often enough.

For food contact chems, sanitation and janitorial I do weekly. I believe my PnP says 'at least monthly' but we do it weekly for ordering purposes. 

Key here is to have a list and control every chemical in your plant, period. If there are new random chemicals, you have to close that loop and figure out why people are bringing unauthorized chemicals into your food plant. 

It's also pretty nifty to use your chemical registry and have whoever is in charge of SDS's make sure they are verifying you have the current SDS on file. That's another reason to keep a complete registry.