For this reason, it's best to eat the dressing within a few days if you can. If you're using store-bought tzatziki and you choose the freshest-marked container you can find, you should be able to store it in the refrigerator for up to two weeks.

When does tzatziki sauce expire? Unopened, a store-bought tzatziki sauce can usually last up to two weeks past the printed date, as long as it's kept refrigerated. Once opened, however, it should be consumed within 3 to 7 days for the best quality.

Tzatziki is a salted yogurt and cucumber dip that's made of strained yogurt, shredded cucumber, olive oil, garlic, lemon juice, salt, and herbs. Authentic Greek tzatziki is most often made with sheep or goat yogurt, but my tzatziki recipe calls for regular full-fat Greek yogurt.