NMN + TMG pairs NMN, which raised blood NAD levels in small human trials, with TMG, a methyl donor. For beginners in the US, four things matter most: what each compound is, what studies actually measured, how the label dose compares with study doses, and why trials judged results at 30 to 60 days or later.
1. What NMN and TMG Are, and Why They Are Paired
NMN is short for β-nicotinamide mononucleotide. In randomized human trials, NMN taken by mouth raised NAD levels in the blood (Yi 2023; Igarashi 2022). Blood NAD is the main marker that most NMN studies tracked.
TMG stands for trimethylglycine. It is also sold as betaine anhydrous. Its principal roles are as an osmolyte and as a methyl donor. As a methyl donor, it works in the methionine cycle, mainly in the liver and kidneys (Craig 2004). In plain terms, it hands off methyl groups. For example, betaine donates methyl groups to homocysteine to form methionine (Zeisel 2003).
Why pair them? The reason comes from biochemistry. An enzyme called NNMT uses SAM (S-adenosylmethionine) as a methyl donor to turn nicotinamide (NAM) into methylnicotinamide. That step produces SAH, a precursor of homocysteine (Li 2024). The idea is that NMN leads to NAM, that clearing NAM draws on methyl groups, and that TMG can help supply them.
Be clear about the limit. This is a mechanistic rationale, not a proven clinical benefit. No published human trial has tested NMN + TMG against NMN alone. Wellness Nest explains the reasoning in more depth in NMN and TMG together: why the pairing matters.
You also get betaine from food. Among the highest sources per 100 g are wheat bran (1,339 mg), wheat germ (1,241 mg), spinach (645 mg), pretzels (237 mg), shrimp (218 mg) and wheat bread (201 mg) (Zeisel 2003).
2. What the Human Research Measured, and What It Did Not
Most NMN trials are small and short. They measured blood markers, some physical tests and safety. Here is a study-by-study view.
| Study | Who took part | NMN dose | Length | Main result |
|---|---|---|---|---|
| Yi 2023 | 80 healthy middle-aged adults | 300, 600 or 900 mg/day | 60 days | Blood NAD up (highest at 600 and 900 mg); six-minute walk improved; HOMA-IR unchanged |
| Yoshino 2021 | Postmenopausal women with prediabetes, overweight or obese | 250 mg/day | 10 weeks | Muscle insulin sensitivity and signaling increased |
| Igarashi 2022 | Healthy older men | 250 mg/day | 6 or 12 weeks | Blood NAD+ up; nominal gait speed and grip changes; no body-composition effect |
| Liao 2021 | 48 trained runners | 300, 600 or 1,200 mg/day | 6 weeks | Ventilatory-threshold measures up at 600 and 1,200 mg; VO2max and peak power unchanged |
| Fukamizu 2022 | 31 healthy adults aged 20-65 | 1,250 mg/day | Up to 4 weeks | No changes beyond physiological variation; no severe adverse events |
| Yamaguchi 2024 | 11 healthy middle-aged men | 250 mg/day (2 × 125 mg) | 8 weeks | Open-label, no placebo; NAD+ in blood mononuclear cells up |
Some points matter for beginners:
- Blood NAD went up. In Yi 2023, blood NAD rose significantly in all NMN groups at day 30 and day 60. Industry co-sponsored that trial.
- Some physical tests moved, some did not. Six-minute walking distance improved vs placebo in Yi 2023. In Liao 2021, VO2max itself did not change. In Igarashi 2022, the gait speed and grip results were only nominally significant, and the authors said they "should be validated in larger studies."
- Some metabolic markers did not change. HOMA-IR, a measure of insulin resistance, did not differ from placebo in Yi 2023. Yoshino 2021 did find higher muscle insulin sensitivity, but only in one specific group of women.
- Short-term safety looked acceptable. Single doses of 100, 250 and 500 mg caused no significant clinical symptoms or changes in heart rate, blood pressure or oxygen saturation over 5 hours in 10 healthy men (Irie 2020). The NMN supplier funded the 1,250 mg Fukamizu trial and employed its authors.
What the research did not measure: the pairing. Every trial above tested NMN. None tested NMN + TMG against NMN alone.
3. The Label Dose vs the Doses in Studies
The label of AgeAura Pure NMN + TMG NAD+ Complex says to take 2 capsules daily. Each 2-capsule serving contains:
- 500 mg β-nicotinamide mononucleotide (NMN)
- 250 mg betaine anhydrous (TMG)
- 100 mg trans-resveratrol (Polygonum cuspidatum)
- 150 mg quercetin (Sophora japonica)
- 50 mg apigenin
- 1 mg spermidine (from wheat germ extract)
- 400 mcg DFE folate as L-5-MTHF (L-methylfolate)
The capsule is vegetable cellulose.
NMN: 500 mg. This falls inside the range that trials tested. The range starts at 250 mg (Yoshino, Igarashi, Yamaguchi), runs through 300 to 900 mg (Yi), and goes up to 1,250 mg (Fukamizu). Irie 2020 tested 500 mg as a single dose. In Yi 2023, blood NAD was highest in the 600 and 900 mg groups, so 500 mg sits below those top groups. For a fuller breakdown, see how much NMN per day: what trials used.
TMG: 250 mg. This is where beginners should adjust their expectations. Usual dietary betaine intake is roughly 0.5 to 2 g per day. In healthy adults, 1.5, 3 and 6 g per day for 6 weeks lowered fasting homocysteine by 12%, 15% and 20% vs placebo (Olthof 2003). At 4 g per day or more, a meta-analysis found homocysteine fell by 1.23 µmol/L (McRae 2013).
Those high doses also had a trade-off. At 4 g per day or more, total cholesterol rose by 0.34 mmol/L (Zawieja 2021). A larger 2022 meta-analysis found higher total cholesterol (+14.12 mg/dL) and LDL (+10.26 mg/dL), lower homocysteine (-1.30 µmol/L), and no effect on triglycerides, HDL, fasting glucose, CRP, liver enzymes or blood pressure (Ashtary-Larky 2022).
The 250 mg of TMG in this product is far below every one of those amounts. It is below even usual dietary intake. Do not expect homocysteine lowering from 250 mg. Also, do not assume the cholesterol finding applies at 250 mg. No trial tested 250 mg.
4. How Long People Give It Before Judging
Trials did not judge NMN after a few days. Their checkpoints were:
- Day 30 and day 60 (Yi 2023)
- 6 weeks (Liao 2021)
- 8 weeks (Yamaguchi 2024)
- 10 weeks (Yoshino 2021)
- 6 or 12 weeks (Igarashi 2022)
To match the time frames that researchers used, think in terms of 30 to 60 days at minimum. Think 10 to 12 weeks for a fuller window. Also remember that blood NAD is a lab measure, not a feeling. Many study outcomes came from lab tests or timed physical tests, not from how participants felt.
Keep a simple log. Write down what you care about before you start, take the label dose on a fixed schedule, and check in at the same points the trials used. Our guide on how long NMN takes to work, week 1 to 12 goes week by week.
NMN + TMG Cost and Where to Buy in the US
NMN is legal to sell as a supplement in the US. On September 29, 2025, FDA responded to a Natural Products Association citizen petition and confirmed that NMN is lawful in dietary supplements. FDA found NMN was marketed as a supplement in the US as early as 2017 (NPA).
Wellness Nest sells AgeAura Pure NMN + TMG NAD+ Complex for $69.95 as a one-time purchase. Subscribe & save options on the product page are:
- 1 bottle every 4 weeks at 15% off
- 3 bottles every 12 weeks at 14% off
- 6 bottles every 24 weeks at 14% off
The product page says the capsules are non-GMO and vegan, made in a USA cGMP-certified partner facility, with no artificial fillers or preservatives. It also has a 90-day money-back guarantee. For other popular Wellness Nest products, see the Wellness Nest best sellers page.
Who Should Wait or Ask a Doctor First
The product page lists who should talk to a doctor before use:
- People who are pregnant or nursing
- Anyone under 18
- Anyone taking medication
- Anyone managing a medical condition
It also states that the product is not a medicine and does not replace medical care.
Check the allergen line too. The product contains wheat, because its spermidine comes from wheat germ extract. The label also says it is free from gluten, soy, dairy, fish and shellfish. If you avoid wheat, read the label and ask your doctor first.
Keep the evidence in view as well. The trials were small, short and mostly in healthy adults. Some had industry funding. Dietary supplements are not FDA-approved to treat, cure or prevent disease.
If you decide to wait on NMN for now, you can browse the Wellness Nest best sellers instead.
Frequently Asked Questions
Is NMN legal to buy in the US?
Yes. On September 29, 2025, FDA confirmed that NMN is lawful in dietary supplements. It did this in response to a Natural Products Association citizen petition.
Do I need TMG if I take NMN?
No study shows that you do. The pairing rests on a mechanistic rationale about methyl groups. No published human trial has tested NMN + TMG against NMN alone.
Will 250 mg of TMG lower my homocysteine?
Do not expect it to. Homocysteine fell at 1.5 to 6 g per day of betaine. The 250 mg in this product is below even usual dietary intake, and no trial tested 250 mg.
What time of day did trials give NMN?
Yi 2023 gave NMN once daily. Yamaguchi 2024 gave it once daily before breakfast. The product label says 2 capsules daily.
How soon should a beginner judge results?
Trials checked results at day 30 and day 60, and at 6 to 12 weeks. A fair test is the label dose taken daily for that window. Many measured changes, such as blood NAD, show only in lab tests.
About the Author
Dr. Marcus Hale — Dr. Marcus Hale is the resident health researcher behind Wellness Nest's editorial team, translating peer-reviewed sports-nutrition and longevity research into practical daily guidance for US readers.
