TMG product beside eggs and whole-grain bread

TMG vs choline: how the two differ and which fits

TMG and choline are not rivals for the same job. Choline is a nutrient the body uses for cell membranes, fat transport and nerve signalling. TMG (trimethylglycine, also called betaine) is a methyl donor that helps convert homocysteine back into methionine. The body can make TMG from choline, so the two overlap, but one does not replace the other. Which one fits depends on your diet, your blood results and your reason for looking at supplements.

This guide compares them on function, food sources, dose, side effects and who might consider each. It also covers the question behind the related searches: how TMG relates to folate.

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TL;DR

  • Choline is an essential nutrient from food. TMG is betaine, a compound the body makes from choline and uses as a methyl donor.
  • Choline addresses a possible dietary gap. TMG addresses a specific homocysteine or methylation rationale. Neither is better for everyone.
  • Check food and blood values first. Dutch guidance gives an adequate choline intake of 400 mg a day for adults, with weak underlying evidence.
  • TMG is dosed in grams in the research, and at 6 g a day it has raised LDL cholesterol in trials. Start low and ask a professional about your own situation.
  • Folate, TMG and choline all feed the same one-carbon pathway, so they are often discussed together. Review your whole supplement list before adding another product.

Table of Contents

What choline does in the body

Voedingscentrum describes choline as a nutrient that the body can make, although not everyone makes enough. It is part of cell membranes and matters for fat transport and for the transmission of signals between nerve cells.

That range of jobs explains why choline appears in claims about brain health and liver health. The claims often run ahead of the evidence. A choline product is a nutrient product. It is not a shortcut to a specific outcome.

Food sources and the 400 mg figure

Voedingscentrum lists eggs, meat, fish, whole-grain products, vegetables, fruit, fats and oils among the sources of choline. The adequate intake it shows for adults is 400 mg a day. It is 480 mg during pregnancy and 520 mg during breastfeeding.

The Dutch Health Council is cautious about this number. In its advice on nutrient norms for adults, choline’s adequate intake rests on weak evidence. It is not a target that proves supplements are needed. For most Dutch adults, the sensible first step is a look at the plate, not a capsule.

Why needs differ between people

Choline requirements are not the same for everyone. In a controlled depletion study, men and postmenopausal women were more likely than premenopausal women to develop signs of fatty liver or muscle injury on a low-choline diet. Oestrogen status and genetic variation played a part. For readers over 50, this is a reason not to assume that one dose suits everyone.

What TMG does in the body

TMG is the same molecule as betaine. The names are used interchangeably on labels and in research. Its best-known role is as a methyl donor. It lets the body convert homocysteine into methionine, a step that runs in parallel to the folate and vitamin B12 route.

That is why TMG is mostly discussed in connection with homocysteine, a marker linked to cardiovascular risk. An overview of TMG as a therapeutic supplement notes that TMG is used mainly for people with high homocysteine. It also describes the evidence for wider use in healthy people as mixed.

The cholesterol question

The most common question about TMG is whether it raises cholesterol. A Dutch-led analysis of four placebo-controlled trials in healthy people found that betaine at 6 g a day for six weeks raised LDL cholesterol by 0.36 mmol/l compared with placebo. Lower doses also moved LDL upward, but those changes were not statistically significant.

The same analysis looked at phosphatidylcholine, a form of choline. It did not show the same lipid signal. Anyone who has high LDL cholesterol or takes lipid-lowering medication should discuss TMG with a doctor before starting, and should ask for a lipid check after a few weeks at higher doses.

TMG and choline side by side

Criterion Choline TMG (betaine)
What it is Essential nutrient from food and from the body’s own synthesis Compound made from choline, also found in food
Main role Cell membranes, fat transport, nerve signalling Methyl donor in homocysteine remethylation
Typical rationale A possible gap in dietary intake A targeted homocysteine or methylation goal
Reference amount Adequate intake 400 mg a day for adults (Dutch guidance) Research doses are often in grams, not milligrams
Forms on labels Choline bitartrate, phosphatidylcholine, free choline Betaine anhydrous, labelled TMG
Main caution Needs vary with sex, menopause and genetics Higher doses have raised LDL cholesterol in trials

The practical distinction is not simply “methyl donor versus brain nutrient”. Both take part in related pathways. They overlap metabolically, but they are not interchangeable ingredients.

Is TMG a substitute for choline?

Partly in one pathway, not in general. TMG can donate methyl groups in the same homocysteine reaction that choline-derived betaine serves. It cannot replace choline’s structural job in membranes or its role in making phosphatidylcholine. If your concern is a low-choline diet, TMG does not solve it. If your concern is a raised homocysteine value, choline is not the usual first tool.

Where TMG and choline roles overlap and differ

One search result even argues that the body should receive upstream methylators such as choline rather than TMG, because TMG sits further downstream. That is one view. It shows that experts disagree and that the answer depends on your goal and your measurements.

TMG and folate

Many readers ask about TMG together with folate. The reason is that homocysteine can be recycled by two routes. One uses folate (with vitamin B12). The other uses betaine, which is TMG or the betaine made from choline. When one route is short of supply, the other carries more of the load.

In the Netherlands, researchers at UMC Utrecht have studied these nutrients together. Their prospective study on dietary folate, betaine and choline intake in women examined cardiovascular disease risk across all three.

For your own decisions, this means:

  • Folate, B12, choline and TMG are linked, so a high homocysteine value does not point automatically to TMG.
  • A 2025 Maastricht University analysis of 16,267 European participants found only weak to moderate links between what people eat and the blood levels of these nutrients. A diet review alone cannot tell you where you stand.
  • A blood homocysteine result, interpreted by a doctor, is more informative than a longevity claim on a label.

How to choose: five questions

  1. What is the goal? A dietary gap points to food and, where needed, choline. A raised homocysteine value points to a conversation about folate, B12 and TMG.
  2. What does your diet contain? Eggs, fish, meat, whole grains and vegetables already supply choline. If you eat few animal products, a review is more useful than a guess.
  3. Do you have a blood value? Without a homocysteine result, you are choosing blind.
  4. What else do you take? Combining several products can duplicate ingredients.
  5. Who is it for? Dose, sex, menopausal status and medication all matter.

Reading the label

A common mistake is to compare milligram numbers as if they measured the same thing. Choline bitartrate, phosphatidylcholine and free choline deliver different amounts of actual choline per milligram. TMG is betaine. Compare the declared active amount and the form, not the capsule weight.

What about choline for fatty liver?

People also ask which choline supplement is best for fatty liver disease. A 2025 randomised controlled study in patients with non-alcoholic fatty liver disease gave phosphatidylcholine 2,400 mg a day for 12 weeks on top of conventional care. The group of 39 showed improvements in liver fat, fibrosis, liver enzymes and triglycerides compared with 40 controls on conventional care alone.

This is early, disease-specific evidence. The authors asked for larger and longer studies. It does not make phosphatidylcholine the best choice for everyone with fatty liver. If you have a liver diagnosis, this is a conversation for your doctor, not a product choice.

Older adults and caregivers: the complexity risk

For older adults, the larger risk is rarely picking the wrong methyl donor. It is product complexity. The Dutch annual overview of supplements from the UMC Utrecht information centre points out that supplements can contain a wide range of ingredients, from vitamins and minerals to herbs and stimulants. Labels may not fully reflect what is inside, and several products together can duplicate ingredients.

If you buy for a parent or partner, bring the full list of medication and supplements to a pharmacist or GP before adding TMG or choline. That includes anything bought online.

Our perspective

We sell TMG, so we state our view plainly. We do not think TMG is a better choice than choline in general. They answer different questions.

Choline belongs first in the food conversation. If the diet is varied and includes eggs, fish and whole grains, we see no reason to treat 400 mg as a supplement target. The Dutch guidance itself describes the evidence behind that number as weak.

TMG belongs in a narrower conversation: homocysteine and methylation. This is also where it connects to our other products. People who take NMN, for example, often look at methylation support alongside it. We explain that reasoning in our article on TMG and NMN together.

Our practical rules are these:

  • Know your starting point. A blood value and a diet review come before a purchase.
  • Start low. Our guide to starting TMG at 0.5 to 1 g covers safety and testing for Dutch users.
  • Match the dose to the goal. Our page on TMG dosing from 500 mg to 4 g explains how.
  • Read the label for the active amount. We publish our formulations openly, and our products are vegan and assembled in the Netherlands.

— Jord

Where TMG fits in a routine

If you and your doctor decide TMG is relevant, the form matters less than consistency and a sensible dose. Our Vivetus® Trimethylglycine (TMG) capsules come as 60 capsules of 500 mg. The 500 mg size lets you build up in steps instead of starting at a gram-level dose. You can also read how the compound works in our guide to the methylation mechanism and the 3 to 6 g dose range, or see the full Vivetus® range. Orders over €50 ship free.

Vivetus® Trimethylglycine (TMG) - 60 capsules - 500mg

Common mistakes

  • Assuming more is better. Homocysteine is a marker, not a score to push as low as possible.
  • Taking TMG to fix a choline gap. The two do different jobs.
  • Ignoring folate and B12. They share the pathway.
  • Starting at a gram-level dose. Higher doses carry the LDL signal seen in trials.
  • Stacking products without a list. Duplicates are easy to miss.

FAQ

Is TMG the same as betaine?

Yes. TMG, trimethylglycine and betaine anhydrous are names for the same molecule. Betaine HCl is a different product, sold for another purpose, so check which one a label states.

What foods are good sources of choline?

Voedingscentrum names eggs, meat, fish, whole-grain products, vegetables, fruit, fats and oils. Together these cover the 400 mg adequate intake for most people who eat a varied diet. Pregnancy and breastfeeding raise the figure to 480 and 520 mg a day.

Can I take TMG and choline together?

They are often combined in practice, and the body makes TMG from choline anyway. The question is whether you need both. Ask a pharmacist or doctor to check the combination against your medication, especially if you have high cholesterol or a liver condition.

Should I take TMG with folate?

The two work on the same homocysteine pathway by different routes. Whether you need either depends on your homocysteine, folate and B12 values. Ask your GP for these tests before you decide.

Sources

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