[This review was collected as part of a promotion.] I was excited to start Nugenix NMN for potential improvements in energy, cognitive function and / or sleep. After taking it regularly, I can't say anything concrete one way or another, good or bad. It had a truly neutral affect on me, which is honestly true of a lot of supplements, so I would not say that's typical of NMN. Just happens to not have had an impact on me.
The good news is there were no side effects. It could have been helping me internally without me knowing it, and luckily nothing negative to say about my experience.
They're pretty standard sized capsules. Not too big either in length or width. I'm not a fan of swallowing pills whole. These aren't as easy to take as a pain tablet, for instance, and they don't break down in the mouth with liquid like some do, but they were not too challenging to take.
I'd recommend giving this a try for your overall energy and health, as I've heard a lot of positive feedback about it, just nothing concrete to contribute from my end.