Most people who take TMG with NMN start with a simple 1:1 ratio, such as 500 mg TMG with 500 mg NMN. This is not a proven clinical rule, but it is a practical starting point. 

TMG, also called trimethylglycine or betaine, may support methylation while NMN supports NAD+ production. Some people take less TMG, especially at lower NMN doses, while higher doses should be discussed with a healthcare professional.

NMN and TMG are popular in the healthy aging space, but the “perfect ratio” is not as settled as some supplement pages make it sound.

A better way to think about it is simple: NMN supports NAD+ metabolism, while TMG supports methyl-donor pathways. They work in different but connected areas of the body.

Key Takeaways:

• A common starting ratio is 1:1, such as 500 mg TMG with 500 mg NMN.

• This ratio is practical, not clinically proven as the best dose for every person.

• NMN helps support NAD+ levels, which are involved in cellular energy and repair.

• TMG provides methyl groups and may help support methylation and homocysteine metabolism.

How Much TMG Should You Take with NMN

A common TMG dose with NMN is 500 mg per day, especially if you are taking 500 mg of NMN.

Many people use a 1:1 ratio because it is easy to follow:

For most healthy adults, starting low is the safer move. You can begin with 250 to 500 mg of TMG and watch how you feel.

Some people tolerate TMG well. Others may notice stomach discomfort, nausea, loose stool, or a “wired” feeling when taking too many methyl-donor supplements at once.

Is the 1:1 NMN to TMG Ratio Proven?

The 1:1 NMN to TMG ratio is a practical supplement strategy, not a proven medical standard.

There are human studies on NMN. There are also human studies on betaine, which is another name for TMG. But there does not appear to be a strong human trial showing the exact best amount of TMG to take with NMN.

A more accurate answer is this: TMG may be useful for people who want extra methylation support while taking NMN, especially at moderate to higher NMN doses. But not everyone needs the same amount, and the research has not confirmed one perfect ratio.

Why People Take TMG with NMN

NMN stands for nicotinamide mononucleotide. It is a precursor to NAD+, short for nicotinamide adenine dinucleotide.

NAD+ is involved in many basic cell functions, including:

• Cellular energy production

• DNA repair pathways

• Mitochondrial function

• Healthy aging research

• Metabolic processes

As the body uses NAD+, it also produces nicotinamide, sometimes shortened to NAM. Nicotinamide can be recycled back into NAD+ through the salvage pathway, or it can be methylated and cleared through a pathway involving an enzyme called NNMT.

This is where TMG enters the conversation.

TMG provides methyl groups. These methyl groups are part of methylation, a normal biochemical process involved in DNA regulation, neurotransmitter metabolism, liver pathways, and homocysteine metabolism.

In plain English, think of methyl groups like small chemical tags the body uses to run certain processes. TMG is one source of those tags.

Does TMG Help NMN Turn Into NAD+?

Not directly. TMG does not “activate” NMN or turn NMN into NAD+. That wording is too loose.

A better explanation is this: NMN supports NAD+ production. TMG may help support methylation pathways involved in processing nicotinamide-related byproducts from NAD+ metabolism.

The body uses an enzyme called NNMT to methylate nicotinamide. This reaction uses SAM, short for S-adenosylmethionine, as a methyl donor and produces SAH, short for S-adenosylhomocysteine. 

Since SAH is related to homocysteine metabolism, some researchers and supplement users pay attention to methyl donors when using NAD+ precursors.

Still, this does not mean every person taking NMN automatically needs TMG. It means the pairing has a reasonable biochemical basis, but the exact dose is still not nailed down in human trials.

What Human Research Says About NMN

Human NMN research is still developing, but several studies give us useful dose context.

One study in 10 healthy Japanese men tested single NMN doses of 100 mg, 250 mg, and 500 mg. Researchers reported that single-dose NMN was well tolerated and that certain NMN metabolites increased in the blood in a dose-related pattern (1).

Another randomized, placebo-controlled study gave healthy older men 250 mg of NMN per day for up to 12 weeks. The study reported that NMN was well tolerated and increased whole-blood NAD+ and NAD+-related metabolites (2).

A 6-week study in amateur runners used 300 mg, 600 mg, and 1,200 mg of NMN per day. The study found improvements in ventilatory threshold during exercise training, with a dose-related pattern, but it did not show a change in VO2 max (3).

Another clinical study using 300 mg, 600 mg, and 900 mg of NMN daily reported increased blood NAD levels and good tolerability over the study period, with the authors noting stronger clinical response around 600 mg per day (4).

What Human Research Says About TMG

TMG is also called betaine. It has been studied for homocysteine metabolism, especially at gram-level doses.

One meta-analysis found that 4 to 6 grams of betaine per day lowered plasma homocysteine in healthy adults by about 1.23 μmol/L, or 11.8% from baseline (5).

That sounds useful, but there is a catch. Other research has reported that 6 grams per day of betaine may raise LDL cholesterol and triglycerides in some settings (6). 

That does not mean a lower 500 mg dose will have the same effect. It does mean high-dose TMG should not be treated like harmless candy.

This is why a moderate NMN and TMG ratio makes more sense than “take as much as possible.”

Do You Really Need TMG with NMN?

You do not automatically need TMG with NMN.

TMG may make more sense if:

• You take a moderate or higher NMN dose

• You already focus on methylation support

• You have been advised to support homocysteine metabolism

• You take other NAD+ precursors and want a more balanced stack

• You want a simple methyl-donor pairing with your NMN routine

TMG may be less necessary if:

• You take a low NMN dose

• You already get methyl donors from other supplements

• You take methylfolate, methyl B12, SAMe, choline, or other methylation products

• You are sensitive to methyl-donor supplements

• Your clinician has told you to avoid certain methylation supplements

The honest answer is not flashy, but it is more useful: some people may benefit from pairing NMN with TMG, but the best dose depends on the person.

When Should You Take TMG and NMN?

Many people take NMN and TMG in the morning. That schedule makes sense because NMN is linked to cellular energy pathways, and some users prefer not to take it late in the day. TMG can be taken at the same time or with a meal.

A simple routine may look like this:

If your supplement label gives different instructions, follow the product directions. If you take medications or have a health condition, check with a healthcare professional before adding NMN, TMG, or other NAD+ support supplements.

Possible Side Effects and Safety Notes

NMN appears well tolerated in several short-term human studies, but long-term research is still limited.

Some people report:

• Headache

• Digestive discomfort

• Nausea

• Sleep changes

• Feeling overstimulated

TMG can also cause side effects in some people, especially at higher doses.

Possible TMG side effects include:

• Upset stomach

• Nausea

• Loose stool

• Body odor changes

• Restlessness in methyl-sensitive people

Be more careful with NMN and TMG if you:

• Are pregnant or breastfeeding

• Have kidney or liver disease

• Have high LDL cholesterol or high triglycerides

• Take prescription medication

• Have a cancer history

• Use several methyl-donor supplements already

• Have been told you have methylation-related concerns

This is not because NMN or TMG are automatically risky. It is because supplement stacks can get messy fast. Two capsules here, one powder there, a B-complex on top, and suddenly your “simple routine” looks like a chemistry shelf.

Best NMN to TMG Ratio for Most People

For many healthy adults, the most practical NMN to TMG ratio is: 500 mg NMN with 500 mg TMG That gives you a clean 1:1 ratio without jumping into high-dose TMG. If you take 250 mg NMN, 250 to 500 mg TMG may be enough.

If you take 1,000 mg NMN, some people use 500 to 1,000 mg TMG, but it is smart to be more cautious at that level. Higher is not always better, especially if you are stacking TMG with B vitamins, choline, SAMe, or other methylation supplements.

A Simple Rule of Thumb

Use this simple rule: Start with a 1:1 ratio only if your NMN dose is moderate, such as 500 mg per day. For higher NMN doses, you do not always need to match TMG gram for gram. A 500 mg TMG dose may still be a reasonable starting point.

For lower NMN doses, start lower. That gives you room to adjust without overdoing it.

Final Words

Most people who take TMG with NMN use 500 mg TMG with 500 mg NMN as a practical starting point. The 1:1 ratio is popular because it is simple, not because human studies have proven it is the perfect ratio.

NMN may support NAD+ levels, while TMG may support methylation and homocysteine metabolism. That makes the pairing reasonable, but not mandatory for everyone.

Start low, keep the routine simple, and avoid treating higher doses as automatically better.

For those building a simple NAD+ support routine, Omre NMN + Resveratrol offers 500 mg NMN, 500 mg micronized trans-resveratrol, and 5 mg BioPerine in a third-party tested formula. 

It can be a good fit if you want NMN in a clean, research-informed supplement without creating an overly complicated stack.

References:

(1) Irie J, et al. Effect of oral administration of nicotinamide mononucleotide on clinical parameters and nicotinamide metabolite levels in healthy Japanese men. Endocrine Journal. 2020.

(2) Igarashi M, et al. Chronic nicotinamide mononucleotide supplementation elevates blood nicotinamide adenine dinucleotide levels and alters muscle function in healthy older men. NPJ Aging. 2022.

(3) Liao B, et al. Nicotinamide mononucleotide supplementation enhances aerobic capacity in amateur runners. Journal of the International Society of Sports Nutrition. 2021.

(4) Yi L, et al. The efficacy and safety of β-nicotinamide mononucleotide supplementation in healthy middle-aged adults. Frontiers in Nutrition. 2023.

(5) McRae MP. Betaine supplementation decreases plasma homocysteine in healthy adult participants: a meta-analysis. Journal of Chiropractic Medicine. 2013.

(6) Olthof MR, et al. Effect of homocysteine-lowering nutrients on blood lipids: results from four randomized, placebo-controlled studies in healthy humans. PLOS Medicine. 2005.

(7) Sun W, et al. Nicotinamide N-methyltransferase: a novel therapeutic target for metabolic syndrome. Frontiers in Pharmacology. 2024.