I am so please to see such a great NMN from Drs Hope. I know this product is from a NSF cGMP certified quality manufacturer. I’ve used other products like this but this one has been my preference. It’s much more value than other options out there and seems to be very high quality. I notice an overall sense of well being, increase in mood, energy level through out the day, sleep, and metabolism. Highly effective. It’s one of those items you don’t know you need until you take it! Grab it and try it out.