Another update 12/8/21: I have been taken 300mg each morning for a few months now. Over the last three weeks I've been noticing a decline in energy, sleep and clarity. It made me wonder if I started to build a tolerance or plateau and need to increase dosage over time. I decided to add an additional 150mg to my original 300mg dosage yesterday morning. I didn't really notice anything till I woke this morning. I had a little more energy waking up, a little more clarity, and slightly better mood. I had more vivid dreams too. I will say that life has been quite busy of late, and I have been eating quick and easy packaged snack food (mostly processed grains) that doesn't agree with normal my anti-inflammation/anti grain diet. This is causing painful inflammation which could be causing increased fatigue, brain fog, and low mood. That said, I might have stayed good at the 300mg dose if I was eating better. Hopefully I can get off this merry-go-round after the holidays and go back to eating right and back to my 300mg, as these are expensive. Still they are worth it. Adding this with my AIP diet, I experienced so much more strength and energy. Not a shaky energy, more like heighten motivation to take on the day and do more. For a time I was working out every morning and beginning to quickly see results in muscle tone. Something I haven't seen in a long while, and something that isn't supposed to be so easy after 40. I think I just messed things up with eating pizza and grains the past few weeks. Thankfully adding on the 150mg is helping a little.

First Update: this is definitely working. It's subtle but I noticed results the first week of taking it. I've been taking this for three weeks now and definitely see a difference in my energy levels. I am getting more done. My thoughts are more organized. I seem to be more motivated as well. Which is huge. I was taking this last year and stopped because I thought they were giving me headaches but I haven't had any headaches in the three weeks I have been taking this at full 300mg dose. I think the headaches may have been from taking it with Pterostilbene. Not sure. I will have to experiment with the Pterostinbene again and report back. I wish I never stopped taking it, as the results are accumulative I'm sure. I spent most of the spring and summer tired/uninspired; and this was in my drawer the whole time. Live and learn. Definitely worth a try.

Original review: I was taking this last year everyday sometimes every other day for a few months and slowly, started to notice more energy, vitality and increased strength endurance. It's a subtle experience over time. Unfortunately, I also noticed that it gave me headaches sometimes. So I started using half the dose. I purchased some empty gelatin capsules and would fill them with half the powder from the NR capsule. This seemed to help lessen the headaches but was a hassle. Eventually I stopped taking them altogether. Not making the connection until now (4 months later) i went from taking power yoga classes everyday to twice a week. I seem to have more brain fog, less muscle strength and increased fatigue. I don't think I fully appreciated how well these worked because it's so subtle. It's not like you feel it working (like a caffeine rush). Now I'm back to repurchase and see if I can get back the strength, vitality, and clarity I experienced last year. Will definitely update to confirm results. The headaches I got with this could have also been from coupling with other supplements so will experiment there. My advice would be to maybe start with 150mg and work your way up from there.

Me encanta la presentación, los sellos que tiene y la calidad del producto.

I started with 100mg for few days and increased to 200mg. I noticed not as tired. I bought a new bottle 300mg after I finished 100mg bottle and took 300mg. I feel tire again. I also let my mom tried it and it helped with her energy. It's strange that 100mg bottle works but not 300mg bottle. I'll finish the bottle and see if it helps.

A very good health product, my whole family and I have been using it for 6 years. I hope the packaging can be simpler to lower the price and give users more benefits.

The marketing and glossy packaging of this product is reminiscent of the kind of thing you would expect to see with a worthless miracle cure supplement sold through a multi-level marketing get-rich-quick pyramid scheme. Whoever is advising the company to take this approach is doind a great diservice to the real science that may lie behind NR.

"NAD levels fall 65% as you age! Niagen boosts NAD levels 40 - 50%." Copying big pharma's use of relative values that sound impressive but that most people don't have the skills to understand. Using their ad chart showing a max NAD level at age 30 -- let's call that value 100 -- declining to a minimum at age 70 -- let's call that value 1 -- a 70 year old man may very well increase his NAD level 50% to a whopping and hardly noticeable 1.5.

That said, there is an abundance of legitimate research on the potential benefits of NR supplementation. This product appears to be the best available and likely worth a trial run. After one month of 300mg/day I've personally noted a definite improvement in sleep quality and possibly a percieved increase in exercise tolerence. I plan to continue using and experiment with a slightly higher dose for one more month.