I have started using this product only 2 weeks ago and only in the morning. I apply 3 layers. It has the consistency of a toner so it is easy to layer. My skin is usually sensitive and often reactive and my barrier is currently compromised. I have already seen improvement in hydration and brightness. The 2% niacinamide is just the right amount. As for the anti-aging property of the ginseng, it will be a longer term process. I adore the natural smokey aroma of this product. I have already purchased a back up as I no not want to be without it.