On a lot of makeup and beauty products, they put the shelf-life on it, sort of like the recycling symbol. It looks like a little circular dish with a number on the inside, standing for how many months after purchase it'll be good for.
That being said, the sliquid products I have don't have that. :/ I wish they did! Especially because this one is organic, I would imagine it would expire faster than other products. I would toss after a year, but if anything changes in consistency or texture before then, it's probably done for.