Question About Supp Expiration Dates

I have a tub of anabolic state inducing post workout powder, and a bottle of creatine pills that have been sitting around my place for awhile. They’re both about 3 months past their “Best By” dates. Is there any problem with still using them, if I don’t wait any longer? I don’t have the money right now to replace them.

Note: Three months past “Best By” date, not “Expired after” date.

Thanks to anyone who can give me some feedback.

If they are unopened they should still be fine.