I won this along with a pack in a giveaway! Thank you! I've used it a few times, so I'm writing a review. I left it in a warm room for a few days without realizing it had to be refrigerated, but so far there doesn't seem to have been any noticeable changes. I've been storing it in the refrigerator since then. Refrigerated products tend to have a strong smell, but this one doesn't have much of a smell, and the serum itself is moisturizing. It blends well with my skin whether I use it morning or night, and it's easy to use! The dropper handle feels a bit wrinkled because it's stored at a low temperature, but this is within acceptable limits as it doesn't affect the liquid. I haven't had any skin irritation since I started using it, and it's been comfortable to use. I'm adding it to my list of serums for this spring and summer!!