Evidence review · 5 studies cited
7 Things Research Shows About NMN After 40
Summary: What human NMN trials measured after 40, what moved, what didn't, and why NMN is paired with TMG.
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NMN is a NAD+ building block
NMN (nicotinamide mononucleotide) is a molecule your body can turn into NAD+, a coenzyme your cells use to make energy.
So the real question is simple: does swallowing NMN raise NAD+ in people? Several trials tested exactly that.
NAD+ rose 38% in 60 days
In a placebo-controlled trial of 66 adults aged 40 to 65, the NMN group's blood NAD+/NADH was up 11% at day 30 and 38% at day 60.
Placebo rose 14.3% by day 60. Note what was measured: a blood marker, not energy or mood.
Human RCT · Huang et al., Front Aging 2022
Blood NAD+/NADH vs baseline
Huang et al., Front Aging 2022. 66 adults aged 40 to 65, 60 days, NMN vs placebo.
Faster walking in older adults
In a 12-week trial of older adults, the NMN group finished a 4-meter walk faster than placebo and had higher blood NAD+. Sleep scores improved too.
Honest caveat: the main outcome, a stepping test, showed no difference. Walking and sleep were secondary results in one small study.
Human RCT · Morifuji et al., GeroScience 2024
The bigger picture is mixed
A 2025 meta-analysis pooled 12 randomized trials with 513 people. NMN reliably raised blood NAD+.
But most health markers, like fasting glucose and cholesterol, did not beat placebo. The authors warn that NMN's benefits may be exaggerated.
Meta-analysis of 12 RCTs · Zhang et al., 2025
Meta-analysis: 12 trials, 513 people
Zhang, Poon, Wong. Crit Rev Food Sci Nutr 2025;65(22):4382-4400.
Why TMG is paired with NMN
Your body clears leftover nicotinamide partly by methylation. In the walking trial, those methylated by-products rose with NMN.
TMG (betaine) is a methyl donor. In healthy adults, daily betaine lowered homocysteine, a methylation marker, within six weeks (Olthof 2003).
Human RCT (TMG only) · Olthof et al., J Nutr 2003
No combined trial yet
Every trial here tested NMN alone or TMG alone. We found no published human trial of the two combined.
So the pairing rests on each ingredient's separate evidence. Unproven as a pair is not the same as unproven at all.
Literature check · no combined NMN + TMG trial found
Trials tested daily use
Every trial above dosed people daily for weeks or months (see sources). None tested taking it now and then.
So the best format is the one you will actually take every day.
Design pattern across every trial cited
Convenience is part of consistency
The trials tested a daily habit, not an occasional one. The practical question is which routine you will keep.
One option: AgeAura Pure NMN + TMG NAD+ Complex puts NMN and TMG on one label, in one daily two-capsule serving.
Taking medication or managing a health condition? Check with your doctor first.
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