I purchased it at Ulta and used it for a while but now I found another one that i like more than this one. Glossy serums like this are a must-have for me because although i have lots of hair, it is thin and prone to breakage so i like to use a serum like this (low scent, no strong weird smell) to help hair strand glide over each other and have less frizz. This should last anyone more than 2 years easily. I’ve had it for close to 1 year. It still has plenty.