NAD Benefits and Side Effects: The Human Data, and 5 Bottles Ranked
Updated on Oct 6, 2026
Medically reviewed by Dr. Sara Alisha Khan, MD, PGDMLE— Written by Dr. Sara Alisha Khan, MD, PGDMLE
Updated on Oct 6, 2026
Table of contents
What NAD+ did in human trials, at what dose, and which bottle gives you that dose with proof.
You've read that NAD+ falls with age. You've seen the benefit lists, and the side-effect threads under them. Maybe you've tried a bottle already.
The NAD benefits and side effects worth your time are the ones measured in people, at a dose you can buy.
We make one of these.
So we held five bottles to the same checks we built ours to pass. First what the trials found. Then the checks and the ranking.
NAD benefits and side effects
NAD+ is the molecule your cells use to turn food into energy. It falls with age in human tissue.
Most capsules hold NMN or NR, the two raw materials your cells turn into NAD+. All five bottles here do.
Benefits, as measured.
Side effects, as measured. In those trials, NMN was well tolerated up to 900 mg a day, with no adverse effects seen at 250 mg over 12 weeks. NR was well tolerated at up to 1,000 mg a day over 8 weeks.
NAD+ given by IV or injection is a different route. This page covers capsules.
The benefits and the safety data both came at a dose. Hold every bottle to it.
What most labels leave out
Every bottle here holds a trial-range dose. The gaps are in the proof.
A trial tested a pure compound. "Pure" on a label is a word. 99% is a number a lab can check.
The side effects a label can't rule out are the ones that come from what else is in the capsule. Heavy metals. Microbes. A lab report shows which batch you got and what it carried.
If it does nothing for you, the guarantee decides what it cost.
A trial dose gets you to the right shelf. The proof picks the bottle.
The 5 checks that matter
Use these on any bottle, ours included.
Ties go to the lower cost per day.
How the top 5 compare
| Product | Trial dose | Purity % | Lab report | Full label | Refund | Passed | Key dose | Cost/day |
|---|---|---|---|---|---|---|---|---|
| Omre NMN + Resveratrol Our pick |
✓ | ✓ | ✓ | ✓ | ✓ | 5 of 5 | 500 mg NMN | $2.30 |
| Nutricost NMN | ✓ | – | – | ✓ | ✓ | 3 of 5 | 500 mg NMN | $0.73 |
| Life Extension NAD+ Cell Regenerator and Resveratrol Elite | ✓ | – | – | ✓ | ✓ | 3 of 5 | 300 mg NR | $1.50 |
| Tru Niagen 300mg | ✓ | – | ✓ | ✓ | – | 3 of 5 | 300 mg NR | $1.63 |
| Elysium Basis | ✓ | – | ✓ | ✓ | – | 3 of 5 | 250 mg NR | $2.17 |
Swipe the table sideways to see every column →
One-time price ÷ servings per bottle, at time of writing, checked Oct 2026.
The 5 best bottles, ranked
Our pick is Omre NMN + Resveratrol, the only one of the five that passes all five checks.
1. Omre NMN + Resveratrol: Passes all five checks
"After one week I noticed the increased energy and stamina. At 74, I need both."
Patricia H., verified buyer
500 mg of NMN a day sits inside the range that raised blood NAD+ and was well tolerated in human trials.
The purity is printed as a number. The lab report sits one click from the buy button. You can check the label against the lab before you spend a cent.
Every batch is tested twice: the raw ingredients, then the finished capsules. 500 mg of micronized resveratrol is paired with it, with BioPerine® for absorption.
See the formula that passes all five checks →2. Nutricost NMN: Trial dose under $1 a day
3. Life Extension NAD+ Cell Regenerator and Resveratrol Elite: Year-long returns, report on request
4. Tru Niagen 300mg: NSF seal, sealed returns only
5. Elysium Basis: NSF-certified NR, all sales final
The proof behind our #1
Is Omre legit? Check it yourself.
Every batch is third-party tested twice, for dose, purity, heavy metals and microbes. The report is on the product page.
Made in the USA in a GMP-certified, FDA-registered facility.
Omre was founded by a doctor, for his family. Dr. Pedram Kordrostami trained in London and practiced in the NHS.
Also mentioned in Forbes · Yahoo Life · GQ · Healthline
Fortune named it the Best Vegan NMN Supplement of 2026.
HSA/FSA eligible, with a 30-day money-back guarantee.
The feeling is real. So is the proof. Asked what changed, reviewers chose "more energy" most, 280+ times, then "less brain fog," 175+ times.
"I've been taking NMN for one month, and I'm feeling better, more energetic, already." — Joseph S., verified buyer
See the lab report on the product page →
Questions before you buy
Does NAD have side effects?
In the human trials of capsules, NMN was well tolerated up to 900 mg a day, with no adverse effects seen at 250 mg over 12 weeks. NR was well tolerated up to 1,000 mg a day. Stop and contact a healthcare professional if you notice an unwanted reaction.
Can I take it with my medications?
If you take prescription medication, ask your doctor first, especially blood thinners, since resveratrol is in the formula. Do not use it if you are pregnant, nursing or under 18.
Are NMN benefits the same as NAD+ benefits?
NMN is the step before NAD+. The NMN benefits measured in trials are NAD+ benefits: blood NAD+ rose, and in one trial six-minute walk distance improved against placebo.
Why pay more than a cheaper bottle?
Nutricost is $0.73 a day and passes three checks. Life Extension is $1.50 and passes three. Omre is $2.30 and passes all five, with the lab report to show for it. In our last customer survey, 93% said evidence matters more to them than price.
Do I have to subscribe?
No. One bottle is $69, one time. Autoship & Save takes 5% off a monthly bottle, 10% off a 3-month supply, or 20% off a 6-month supply. Cancel, skip or pause anytime.
The bottom line
Take the dose the trials took. Then make the brand prove it's in the capsule.
Omre NMN + Resveratrol is the only one of the five that passes all five checks. 500 mg of NMN sits inside the trial range. Its lab report is on the product page. It's backed by a 30-day money-back guarantee.
Choose your supply below, one-time or Autoship & Save ↓
- DMDaniel M.Verified BuyerReviewingNMN + ResveratrolI recommend this productAge Range 55-64Gender MaleHow Longevity Helped? More EnergyRated 5 out of 5 stars3 years agoThis stuff changed my life!!!!!
Ok, this was recommended to me by my doctor - yes, you heard that right! My actual doctor told me to start taking this - This EXACT brand! Because it has the Resvirotrol (spelling?) also in it which she said was important.
Normally I don’t go for these types if things but I trust my doctor implicitly so I ordered it.
I’ve been taking two pills per day for one month now… let me tell you what’s been happening to my body…
I’m a 56 year old guy - I workout a lot - I’m a retired Airline Pilot and I’ve always been I pretty good shape but this stuff has rocketed me into a new sphere of training I though I had left behind 35 years ago! Yes, it’s that good!
Since taking this stuff my workouts last 50% longer and they’re at least 50% more intense!!! I’m not exaggerating!!!!! Even my wife has noticed! I lift heavier, my hikes are way longer and I don’t experience DOMS afterwards.
Somehow I have more energy during the day and it lasts all day. Mind officially blown!!!
This stuff works! I am SO grateful that my doc recommended this to me… it’s not cheap! But I’ll be buying this forever!
BTW - I’m not paid or endorsed in any way by these guys or their company! I don’t know them in any way and I have zero connection to them other than getting my order in the mail from them. (Shipping was not extremely fast though - that sucked).
This stuff is amazing!!!!! Anyone reading this - try it! You can thank me later.
D.M.
- ALANDREW L.Verified BuyerReviewingNMN + ResveratrolI recommend this productAge Range 65+Gender MaleHow Longevity Helped? More EnergyRated 5 out of 5 stars2 years agoLiving more!
Great product I feel full of energy now that I’m taking NMN
- EMEileen M.Verified BuyerReviewingNMN + ResveratrolI recommend this productAge Range 45-54Gender FemaleHow Longevity Helped? More EnergyRated 5 out of 5 stars3 years agoStaying youthful!
I’ve been told I don’t look my age at 53, I do take care of myself from the inside out! I’m adding this NMN+RESVERATROL to my regimen to staying youthful & more. I have been taking a month now & plan on sticking to it♥️
- CLCheryl L.Verified BuyerReviewingNMN + ResveratrolI recommend this productAge Range 55-64Gender FemaleHow Longevity Helped? More Energy, Easy dosingRated 5 out of 5 stars2 years agoRenewed Energy and Life Force
I was told I have autoimmune Hashimoto's in 2020 after I got COVID at 56 years old. I can't even begin to tell you how bone numbing and cell deep my fatigue was, and even worse, NOTHING helped. Not medication, doctors, handfuls of supplements, acupuncture, or Reiki. I could barely get off my couch or out of my bed just to purchase a few groceries , or take a shower. I thought that was going to be my life, forever, which dropped me into depression and a feeling of utter hopelessness. I researched and researched on my own and decided I'd give one more thing a shot, and that was OMRE's Resveritrol and NMN. Within 5 days of taking my first two pills, after being so ill for three years, I had the energy to get out of bed, take a shower, and I actually cooked myself a meal. Within two weeks, I could do that, AND mow my yard, or work a normal day without having to take a nap. Best of all, I actually WANTED to get up, where prior to taking the supplements, I didn't even want to wake up, let alone try to do anything more than just breathe. This supplement gave me a large portion of my life back. I still have a few “down days†a month because Hashimoto's doesn't just go away, but those days are days where all I do is take a nap, and resume my normal life straight away after it. Yes, they are on the expensive side (and being on a low fixed retirement income, hard to afford), but the benefits far, far outweigh the price. I couldn't recommend trying something more than I do this…
- SEstephen e.Verified BuyerReviewingNMN + ResveratrolI recommend this productAge Range 55-64Gender MaleHow Longevity Helped? Easy dosingRated 5 out of 5 stars2 years agoLongevity and energy
I bought these after reading others reviews and the independent testing that’s been done. I follow David Sinclair and his approach for longevity and health.
It’s early days, just over a month so far I feel good, my skin appears clearer and I don’t appear to have any side affects.
I’ll continue with the capsules.