I must start this review by saying they didn’t have Jason’s “Thin to thick” as a choice, but this product deserves a review because it actually works! I chose the bottle that looks the most like the one I am going to review. I will post a photo of the Thin to thick shampoo and conditioner I am reviewing. I was skeptical about this until I used some of my Mom’s while I was visiting over Christmas a couple years back. Wow! I couldn’t see a difference in thickness right away, but I left the conditioner in while I moved on to cleansing my body, and there was a pleasant surprise! A cool tingling sensation. Oh, did I mention the intoxicating smell? After the beautiful shine, softness, and smell of this shampoo and conditioner, I knew I was going to order some. I’ve been using it ever since, and it works! My hair stopped falling out so much in the shower, and actually began filling back in. I’m 43, and had undergone surgery. No matter the cause, if you have thin hair, try Jason’s “Thin to Thick.” You will not be disappointed. However, it takes about three weeks to see a noticeable difference. Happy shampooing!