How long are my esmi products good for? Most of your esmi products have a shelf life of 2 years unopened, but 1 year once opened! So this means if you open your Hyaluronic Hydrating Serum after 1 year & 8 months, you only have 2 months to use it! So don't stock up too much 😉 But there are some exceptions within the range, so send us a DM if you are ever unsure!