There is a very important reason why we offer this in two separate products and not just one. By separating the two products, a standalone NAD+ Booster and a powerful and pure Sirtuin activator, you'll be able to supplement your body when it needs it most. Sirtuins are most active while you sleep, making it crucial to take any kind of sirtuin activator at night, before you go to bed. Why? Because both Pterostilbene and Resveratrol have a half-life of 3-4 hours. So, taking it in the morning really doesn't let you get the full experience - making you miss out on the good stuff. Now, NAD+ works best and is recommended to be taken in the morning so that you have high energy levels throughout the entire day. Nicotinamide Riboside has been proven to elevate NAD+ level within 8 hours5 and stay elevated for upto 24 hours. But when the two ingredients are combined into one, one or the other must sacrifice efficacy due to not supplementing at the appropriate time.