OK to eat 6 month expired whey protein powder?

I stopped lifting weights for awhile and my protein powder expired. It was kept in my closet, so it has been in a cool and dark place. Also no moisture has gotten in so it hasn't clumped. I assume it might just start degrading a little and would still be fine to eat but wasn't sure. Internet search didn't really provide a definite answer. And since its derived from dairy. Has anyone eaten expired protein powder? Make you sick? Thanks.