Does Re-Lyte Immunity expire?

Re-Lyte Immunity doesn't expire, but it has a "best by" date that's two years after the time it's manufactured.

Re-Lyte Immunity doesn't expire, but it has a "best by" date two years after its manufacture. We know all the "best by," "use by," "sell by" terminology you see on products can get confusing, so here's a quick explanation of what that means:
A "best by" date is different from an expiration date. It means that after this date, Re-Lyte Immunity may begin to decline in flavor and effectiveness, but it's still safe to use.