My wpi smells kinda funny it's 100% pure whey protein isolate and is smelling kinda weird .
What does out of used by date wpi do does it still work or what ?
Its going sour. Like milk in a way. If it tastes fine you should be fine. I wouldn't let it go too far past the expiration date though. Maybe 6 months at most.
If you are worried I wouldn't eat it. The shelf life of most protein powders is about 12 months, perhaps a little longer. If it smells bad it has gone sour (microbial growth), like milk or any other dairy product.