NMN Supplements Personal Case Study

NMN (full name nicotinamide mononucleotide) is a precursor to NAD – a key molecule in cellular energy production. Recently, the awareness of NMN has increased dramatically, particularly due to the public admission by Harvard professor David Sinclair that it is part of his daily supplement regime. His reports of his own, and his father’s, positive experience with it certainly got me interested.

I’ve recently turned 50, so am definitely starting to feel the aches and pains of ageing, even though I do my best to keep in shape and (less successfully) eat and drink healthily. NMN therefore looks like an ideal candidate to try to see whether it makes a meaningful impact on my day to day living.

My plan is to try 1,000 mg (or 1 g) of NMN daily for one month, and track using a health app how I feel and see if there is any improvement in physical or mental health over that period. To provide more objective results, I’m also going to perform a before and after blood test with my regular provider, Medichecks*. See “trial protocol” below for more details.

This blog is sponsored by DoNotAge. They have generously provided a month’s supply of Pure NMN capsules. They did not request, and have not been given, any editorial input to this article.  The Live Forever Club will always provide independent and unbiased information about life extension.
FREE SHIPPING – DoNotAge has also kindly provided a free shipping code for all Live Forever Club visitors – just enter LIVEFOREVER when checking out.
You can see their range of NMN and resveratrol supplements in their online shop: https://www.donotage.org/shop

Issues covered in this blog post:

What Is NMN And What Does It Do?

NMN works at a very low level in the body’s metabolism. It’s doesn’t do anything exciting itself, like creating antibodies or fibres, it just recycles another molecule when it gets used up. That doesn’t sound very exciting, but when the molecule it is recycling is NAD, its importance becomes more apparent.

NAD (nicotinamide adenine dinucleotide) switches between its two forms, NAD+ and NADH, by accepting electrons (for example from food) and donating them to other processes. This supports many other crucial reactions in the cell that enable energy production and cellular signalling.

NAD+ helps to produce ATP via glycolysis, the citric acid cycle and the electron transport chain (inside mitochondria). Most cells in the body use approximately one billion ATP molecules every minute – so if there isn’t enough NAD around to replenish the ATP your cells start to die. That’s why NMN as a NAD booster, which increases energy metabolism, could be one of the most effective supplements available.

NAD also plays an important role in cellular signalling. One of the most critical is the maintenance of sirtuins which are involved in coordinating an array of crucial functions such as blood vessel growth, stem cell rejuvenation and DNA repair.

Why Does NAD Need Boosting?

NAD levels reduce with age2,3,5 resulting in mitochondrial dysfunction, glucose intolerance and cellular senescence to name just a few. Back in 2012, researchers at University of New South Wales4 examined the NAD content of skin tissue in humans of different ages. The results showed a pretty clear decline in NAD levels the older we get.

NAD reduction with age (males)

Looking at their best fit curve, I’d estimate the following levels measured in nanograms per milligram of protein (a nanogram is a millionth of a milligram):

AgeNAD+ (ng/mg)

I’m 50 – so my cells have about half the amount of NMN in them than when I was 20 – no wonder I only have half the energy!

This means that boosting the level of NAD with NMN has the potential to reverse some of this age-related decline1. So why not take NAD supplements instead of NMN (its precursor)? Two reasons. Firstly, even though there are plenty of articles out there explaining which foods are good sources of NAD, it doesn’t really matter as NAD in food is not able to get into your cells from the gut. Secondly, the NAD that is created in your body is constantly recycled. Unlike some vitamins that can’t be made by the body so have to be ingested every day, most NAD+ is refreshed in the NAD salvage pathway and it is the components of that (e.g. NMN) that need to be consumed to make it work efficiently.

However, nicotinamide mononucleotide is not only a long name, it is also a large molecule. That makes it difficult to get into cells and so it sometimes changes to a smaller molecule, nicotinamide riboside (NR) to allow it to enter a cell, where it chemically transforms back to NMN. Recent research has shown that this isn’t necessary for all cells (e.g. the small intestine of mice) and that most of the increase in NAD+ (for both NR and NMN) comes via the increase in nicotinamide (NAM) that increases the recycling of NAD+.

If NMN sometimes transforms into NR first, is NR is taking nicotinamide riboside an alternative? David Sinclair reports (in Lifespan) that he finds NMN more stable and observed some benefits in mice using it that weren’t seen with NR. I’ll probably do another blog later to discuss the differences as these aren’t the only options – Dave Asprey says (in Super Human) that he takes NAD+ intravenously, though that’s at the extreme end of treatments.

NMN Food Sources

Researchers at the Washington University School of Medicine6 looked into how much NMN is in common foods and reported the values below. I’ve added the third column to show how much of each food you’d have to eat to consume the same amount as I’m taking as a supplement. Even for the highest concentration food, soybeans, you’d need to take in over 50 kg per day – so I think it’s fair to say that that’s not a realistic alternative to supplements.

Foodmg/100 g-Foodkg of food to obtain 1 mg NMN
beef (raw)0.06–0.42

Trial Protocol

I was hoping to include a section on who is taking what, which would also help advise me on the best dosage. Unfortunately, apart from David Sinclair, very few people are public on what they are taking – let alone making any recommendations. Likewise, I’m sharing my experience of the latest anti-ageing supplement to help inform your personal choice – no recommendations, just information. There’s a disclaimer at the bottom of every page, but sometimes it’s worth repeating.

Dr. Sinclair takes 1 g at breakfast every day. I’ve decided to split that dose between morning (with breakfast) and evening (with dinner), so my regimen is 500 mg twice a day12. Some people have reported NMN keeping them awake if they take it in the evening, so I’ll consider moving the second dose forward if necessary.

Also, just to be safe, I’ll be ramping up the dosage, taking 500 mg (at breakfast) for the first 2 weeks, followed by 3 weeks at full 1,000 mg dose. Total trial duration = 5 weeks.

NMN supplied by DoNotAge (certificate of analysis states > 99.5% nicotinamide mononucleotide)

Note: the supplements are kept in the fridge for the duration of the trial. This is important as otherwise it can degrade into nicotinamide (NAM)7 – which has been shown inhibit sirtuins – the exact opposite of what we’re trying to achieve with NMN.

Testing will be a combination of blood analysis, home testing and self-assessment.

Blood analysis
Start and end
Medichecks* Well Man UltraVit Blood Test (no fasting)
Blood pressure
Omron IntelliSense M6* Comfort Blood Pressure Monitor
Peak flowWeekly
Omron BF508* Body Composition and Body Fat Monitor
Self-assessment, tracked using MoodScope (initial plan was Cara Care app but MoodScape is provides a quantitative score)

How NMN Supplements Could Affect My Body

What changes should I look out for at the end of my trial? Research in mice1 has reported a long list of beneficial effects on various physiological functions:

  • reduced age-related inflammation (inflammaging)
  • increased insulin sensitivity
  • improved eye function
  • improved liver function
  • reduced kidney damage
  • blood vessel damage reversal
  • telomere maintenance
  • reversed muscle atrophy
  • improved exercise performance

The big question still, and this will only be answered with a large-scale human trial, is whether these benefits transfer to humans. On this low budget, personal trial I won’t be able to check all of those functions, so I’m picking some that I can try to monitor the impact on myself.

I’m a regular runner, with every session logged in a spreadsheet - old-school I know! After a few years of improvement I know have a reasonably consistent pace for short and medium distances, so it will be very interesting to see if that changes over the trial. Though I’m not expecting the results that David Sinclair saw in his mice – they ran for so long the tracking computer hit a bug as it hadn’t been programmed to support mice running more than 3 kilometres!

One effect not on the list above is general energy levels – but that’s probably because you can’t ask a mouse how it is feeling. I tend to feel a bit tired most afternoons when working and sometimes sneak in a 5-10 minutes “power nap”. It will be really interesting to see if this urge to snooze goes away.

Alanene transferaseLiver
Blood analysis
BilirubinLiverBlood analysis
Blood pressure
HeartHome test
Cholesterol ratioHeart
Blood analysis
CRP - High sensitivityInflammation
Blood analysis
DiabetesBlood analysis
Blood analysis
Mental energy
Eye tiredness
Eye functionSelf-assessment
Peak flowLung
Home test
Sleep quality
Blood analysis
Home test

Most biomarkers are being measured objectively so should reflect any genuine physical effects of taking NMN. The only exception is mood which is susceptible to the placebo effect – I can’t deny that I’m quite excited to be trialling it, so I’ll do my best to take that into account when judging my mood.

What Are The Risks?

Although there have not been many human trials with NMN, given the number of people already taking it as a supplement I think if there was a serious risk of acute injury that this would have been noticed by now. But it’s worth looking a bit deeper into any possible health risks.

Generally speaking, in mice studies the animal models have suffered no adverse reactions or toxic effects. With anti-ageing treatments there is always the possibility of increasing the risk of cancer – as most improvements to cellular activity apply across the board, to good and bad cells alike. Although no increase in cancer incidence has been no observed in mice studies, one concern is that for certain types of cancer (pro-inflammatory senescent cell tumour growth) boosting NAD+ may help already established tumours to grow. This is a low risk which I am prepared to take for the much greater chance of an improvement to overall health, and therefore a reduced risk of all other types of cancer.

There has been a very basic human safety trial carried out by Keio University School of Medicine8. This small trial involved 10 healthy men aged between 40 and 60 years old orally taking small doses (100, 250, or 500 mg) at least one week apart. They concluded that it did not cause any significant deleterious effects.

Shin-ichiro Imai, at Washington University School of Medicine, is currently performing a more detailed placebo-controlled study11 with 30 people, 15 of which will be taking 250 mg of NMN per day for 8-10 weeks. I’ll post news of the results of that on the website when available.

As my initial trial is only for month, I would hope to catch and serious issues before any potential damage is done by reviewing the end-of-trial blood analysis.

Risk assessment done… let’s get on with the trial!

My Results

Obviously, I can’t complete this until the end, but I will provide updates if I notice any significant changes (e.g. to energy or fitness) in the interim.

Remember, this is a N-of-1 trial so none of the results will be statistically significant – there could be other reasons to trigger any observed changes, including simple random variation. But hopefully if you’re thinking about taking NMN supplements, this will give you food for thought.

Make sure you’re subscribed to the newsletter, or are following the club on one of the social networks, to make sure you hear how the trial is goes.

Make sure you’re subscribed to the newsletter, or are following the club on one of the social networks, to make sure you hear how the trial is goes.

Week 3 Update

So this is my first week at full dose – 500 mg with breakfast, and same again late afternoon – total 1 gram per day. Yesterday I forgot to take it in the afternoon so took it an hour before I went to bed, which some people have reported makes it difficult to sleep. It’s possible it had a very small negative effect on dozing off, but I’d had a mid-week social so might have just been that. I’ll try to do a couple more tests over the next week or so.

Otherwise, still pretty much the same. Still full of energy, and feels like I’m not so tired after a bit of weekend gardening. I have had a couple of micro-naps (sub-5 minutes) – but the difference being I’ve not had a background urge for one all day, just felt like a quick recovery shut-eye after a particularly intense bit of mental work. It will be very interesting to see if I go back to feeling tired after the end of the trial – I’ll be doing a supplemental report about a month afterwards.

Four to five days into the full dose, I did feel like I had slightly bulgy eyes and that I was whizzing around a bit too fast, but checked my blood pressure and that was looking OK. Days six to seven (today) have been better.

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Week 2 Update

A similar report to last week – definitely feeling like I have more energy and eyes don’t feel tired anymore. I’ve just done a home blood pressure check and it’s the highest it has been for 4 months – it does vary quite a bit, but one to watch.

The strange running sweat incident hasn't repeated itself (but I only do 1 long run a week, so still monitoring) though I did do a personal best (PB) for 8 miles off-road. As always, could be a coincidence, but I’ve lots of running data for the months before the trial so will be interesting to see if the average increases for the duration.

If these improvements are statistically significant then they should really firm up over the next few weeks as I’m about to increase my daily dose to the full 1,000 mg (1 gram).

I’ve tried to determine whether it’s better to take it all in one go (like David Sinclair) does, or to spread it out. There’s not much information around (unsurprising given the lack for studies in humans) though one supplier recommends not splitting doses below 300 mg. The argument for and against seems to revolve around possibly needing a high enough level to overcome metabolism and to get it into the cells, versus using too much in one go might result in it being flushed away before it can be incorporated.

A review of research into the biology of NAD+ intermediates suggests that the NMN doesn’t last that long in the blood stream13, so I’m going to stick with my original plan of split dose. Though I’m now going to take the second dose late afternoon so that (i) it reduces the risk of sleep problems, and (ii) it might give a boost to my early evening exercise.

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Week 1 Update

One week in, so too early to make any real assessment (especially with only one trial participant) but thought I’d report back on my subjective evaluation so far. Definitely too early to even look at first week home tests (blood pressure, peak flow, etc).

I’m currently on half dose (500 mg) so wouldn’t expect to feel any effects, though I have to say that from day 1 I think there’s been a slight increase in my energy levels. I’ve got used to a background yearning for a snooze – almost from the time I wake up I’d be happy to have 5 minutes with my eyes closed on the sofa, not that I often took one. But from day 1 of my NMN trial that urge seems to have receded.  On the first day I put it down to the excitement of starting on the supplements, but a week on and I still feel the same. It’s like the feeling when, after thinking a cold has passed for a few days, it really does go away and you remember what a clear head really feels like. That’s the sensation I have now.

Another positive is my eyes. I don’t think I can see any better than before (that would be a very quick response) but I’m not feeling the need to scrunch them up so often or really concentrate to focus on something. One to watch (pun intended!).

Now for the downsides. I’ve noticed a few aches that I didn’t have before – almost like muscle bruises. It could be coincidence or somehow the cells are making themselves known, but will be interesting to see if that goes away. Also, on my weekend run I had a hot and sweaty period 3-4 miles in, as if I was running in a heatwave. It was hot, but not that hot. Again, it might be coincidence, and I’ll note if it happens again.

Overall, I’m happy with the way things are going, and am looking forward to increasing my dose next week to see if I notice any more changes.

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1Long-Term Administration of Nicotinamide Mononucleotide Mitigates Age-Associated Physiological Decline in Mice - Cell Metabolism 2016

2Why NAD+ Declines With Age – LEAF

3Why NAD+ Declines during Aging: It’s Destroyed – Cell Metabolism 2016

4Age-Associated Changes In Oxidative Stress and NAD+ Metabolism In Human Tissue – PLOS ONE 2012

5In vivo NAD assay reveals the intracellular NAD contents and redox state in healthy human brain and their age dependences – PNAS 2015

6NMN Is Present in Various Types of Natural Food - Long-Term Administration of Nicotinamide Mononucleotide Mitigates Age-Associated Physiological Decline in Mice (Table 1) – Cell Metabolism 2016

7Why keeping NR & NMN supplements cold is crucial - David Sinclair on FoundMyFitness

8Effect of oral administration of nicotinamide mononucleotide on clinical parameters and nicotinamide metabolite levels in healthy Japanese men - Endocrine Journal 2020

9Telomere Dysfunction Induces Sirtuin Repression that Drives Telomere-Dependent Disease - Cell Metabolism 2019

10NAD+ in Aging: Role of Nicotinamide Riboside and Nicotinamide Mononucleotide - FoundMyFitness (YouTube)

11Effect of "Nicotinamide Mononucleotide" (NMN) on Cardiometabolic Function (NMN) - ClinicalTrials.gov

12NMN dosage recommendations (split above 300 mg) – New You Cell Renew

13NAD+ intermediates: The biology and therapeutic potential of NMN and NR - Yoshino, Baur, & Imai - Cell Metabolism 2018

Mentioned in this blog post:

Academic David Sinclair - Harvard professor on ageing and co-founder of several biotechnology companies

Company DoNotAge - On a mission is to extend healthy lifespan for as many people as possible

Academia University of New South Wales (UNSW) - Public Research university.

Academia Washington University School of Medicine‘s


Age Reversal in Mammals – Has This Now Been Achieved?

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