Question only for those of you who have ingested protein powder that's been kept too long: What were telltale signs (appearance-wise, taste-wise, smell-wise, et) that indicated it should have been thrown out?
Usually has a shelf life several years after expiration date. If it is clumpy that usually moisture got in the container. If there is a fowl smell, taste, or just doesn't look right then give it to a friend you don't like 🙂