I’ve received several Amika samples in my box recently. I describe my hair as aging, color treated, prone to frizziness and flyaways. When I got this sample I used about a quarter sized amount after shampooing and left it on a few minutes. I love how thick and concentrated it is. I rubbed it between my hands like a lotion before applying. It was very effective at smoothing and detangling my hair after one use. What was left of the tube, I used a tiny amount every morning on my dry hair to smooth the ends and temple area around my face when I wear my hair in a ponytail. It does the trick, even though it is not described as a leave-on product. I also love clean fresh scents and this has that. I just bought the 2 ounce tube from Birchbox. Hopefully it will last a long time. If you use it as a conditioner in the shower, it will go fast unless you are only applying it to your ends.