I ordered a bottle of Restore Vitamin C Serum last year, just to try it. The pump on the bottle let out just the perfect amount for my face. It felt so smooth going on, not greasy or sticky. After a couple of weeks, I began to notice my skin more smooth and my complexion was clearer. Now, after a year of use, at age 72, I can actually say I have fewer wrinkles! One bottle lasts a long time; I’d say about 4 months from twice/day application. It’s an amazing product!!