Started using in January after my husband bought me the serum for Christmas. I purchased the shampoo and conditioner. I have used since the beginning of Jan. I have very fine, flat hair. Both shampoo and conditioner smell beautiful and you need a very small amount to make a good lather, cover your hair. I am still only half way through my bottles- I only have shortish hair. My hair has much more volume and is soft and looks thicker. I also no longer wash my hair every day, No need. It no longer is flat as a pancake and looking really greasy. Excellent . I use the serum daily though . As a result even my hair dresser has noticed a difference. Thank you