I've been using this leave-in serum in conjunction with the pre-cleansing scalp resurfacing serum (twice a month) for about 3 months, and I'm thrilled with the results! My scalp feels remarkably calm, clean, and healthier. I appreciate that both serums are non-greasy, lightweight, and have a pleasant scent. As someone who doesn't wash their hair daily, I often experience itchiness, even when my scalp feels clean. This dynamic duo has effectively addressed this issue. Additionally, I've noticed that my other haircare products seem to work better when used in combination with these serums. The bottle is gorgeous, and the applicator makes it easy to apply on the scalp without dripping. Overall, I'm thoroughly impressed with the positive impact they've had on my scalp and hair health!