It expires. I don't know at what point it becomes unhealthy/dangerous but infant formula is one of the few shelf-stable items that's illegal to sell past the us

It expires. I don't know at what point it becomes unhealthy/dangerous but infant formula is one of the few shelf-stable items that's illegal to sell past the use-by date. Many things are perfectly safe/stable past their 'sell by, best by, use by' dates (bottled water, most canned food) but I haven't read data on this specific item.