Foods High in Betaine (TMG): Amounts and Real Portions

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Trimethylglycine occurs naturally in foods and is also called betaine, TMG or glycine betaine. Useful sources include several grain products, quinoa, leafy vegetables and beets. The amount depends on the food and its preparation, so a dry grain, a cooked serving and a vegetable juice cannot be compared by name alone.

There is another complication: some widely repeated food figures come from older measurements that were later corrected. A useful table should identify its source, preparation and portion rather than promise one exact amount in every plate.

A preparation-specific betaine food table

The examples below use the USDA Database for the Choline Content of Common Foods, Release Two (2008). They are legacy analytical estimates, not a current assay of every variety or brand. Betaine is a separate column from total choline.

Food and database entry	Betaine per 100 g	Example weighed portion	Estimated betaine in that portion
Toasted wheat germ, NDB 08084	410 mg	20 g	82 mg
Toasted wheat bran, NDB 08363	320 mg	15 g	48 mg
Beets, raw, NDB 11080	130 mg	80 g	104 mg
Beets, canned and drained, NDB 11084	260 mg	80 g	208 mg
Spinach, frozen, boiled and drained without salt, NDB 11464	110 mg	100 g	110 mg
Bulgur wheat, cooked, NDB 20013	83 mg	150 g	124.5 mg
Spaghetti, cooked and enriched without added salt, NDB 20121	68 mg	150 g	102 mg

Source: USDA Release Two, original tables. The calculation is mg per 100 g × portion weight ÷ 100. Portions are examples chosen for the arithmetic, not a prescription or standardized household serving.

Convert a food value into the portion you actually eat

The calculation is straightforward: betaine in the portion = betaine per 100 g × portion weight in grams ÷ 100. The difficult part is matching the right food entry and preparation state. A generous-looking nutrient value for a dry cereal is not the amount in a spoonful, and a raw entry cannot automatically describe a cooked serving.

These are examples, not standardized household serving weights or a therapeutic meal prescription. Portions are weighed as described in the entry. The source is the USDA Database for the Choline Content of Common Foods, Release 2; its separate betaine column must not be confused with total choline.

Why you may see very different numbers online

The original 2003 food analysis has a published correction, and the later USDA release explains that a technical analytical problem led to overestimation in some foods, including certain grains, seafood and spinach. [1] This is why we do not copy older high values into a new table without checking the corrected dataset.

The USDA release also warns about variation between plant varieties and growing conditions. A later cereal-food analysis found substantial differences across whole-grain fractions and food products. [2] The figures should help compare foods, rather than suggest that every 100-gram serving contains an identical laboratory-certified amount.

What about quinoa?

Quinoa is a relevant betaine source in cereal and plant-food analyses. The legacy USDA entry 20035 reports 630 mg per 100 grams for its quinoa entry, but it should not be relabeled as a cooked portion. Cooking adds water, and the concentration in a prepared meal depends on the food and method. The cereal-food study is useful additional context for variation in quinoa and grain products. [2]

A more recent plant-food paper also distinguishes glycine betaine from proline betaine, which is prominent in citrus. They are different compounds; a paper measuring one should not be silently cited as the amount of the other. [3]

A worked food example

Using the specific entries above, 150 grams of cooked bulgur contributes an estimated 124.5 mg, 100 grams of prepared frozen spinach contributes 110 mg, and 80 grams of raw beets contributes 104 mg. The total is approximately 339 mg betaine.

This is a composition estimate. It does not promise a particular blood concentration or homocysteine reduction. It also should not be converted into an instruction to eat a large amount of one food to imitate a gram-level research protocol.

Can food betaine affect the same metabolic pathway?

Small human crossover studies have compared food-based betaine with supplemental betaine. One used an approximately 800 mg/day betaine-rich diet and a supplement providing 0.5 grams twice daily for two weeks. Another examined acute food and supplement exposures. [4] [5]

These studies show that diet belongs in the discussion. They do not establish that every meal and capsule has identical effects, or that a numerical food estimate produces a guaranteed treatment response.

Betaine, choline and beetroot nitrate are different

The body can make betaine from choline, but choline has other important functions. A betaine number should not be counted as the same amount of dietary choline. A recent controlled feeding analysis also examined plasma choline and betaine as indicators of choline intake; that was a choline-intake experiment, not a trial prescribing TMG for a health outcome. [6]

Beets contain more than betaine. Nitrate-focused beetroot studies therefore cannot establish that a plain TMG capsule lowers blood pressure. Our blood-pressure guide keeps those ingredients separate.

Does a low database value mean the food has no value?

No. A betaine ranking describes one compound, not the nutritional quality of the whole diet. A food may contribute fiber, protein, minerals or other nutrients without being high in betaine. Choosing meals by one nutrient’s rank can also encourage unrealistic portions of concentrated dry foods.

Missing composition data are another limitation. A blank betaine field should not be treated as a laboratory-confirmed zero. Likewise, a zero displayed for a small serving can result from rounding. Check whether the source measured the compound and which database entry the app is using.

Is there a daily betaine requirement to meet?

TMG does not have an established recommended daily allowance that every adult must reach from food plus supplements. The body can also make betaine from choline, although choline retains other essential functions. A food intake estimate therefore cannot diagnose a betaine deficiency or establish a capsule requirement. ^{[7] [8]}

Food and supplement comparisons should stay tied to an outcome. In a small randomized crossover study of eight men, a betaine-rich diet supplying about 800 mg/day and a supplement of 500 mg twice daily were studied over 14 days. Both affected circulating betaine and the post-methionine-load response, but that does not make the meal pattern a demonstrated disease-prevention treatment. ^[4]

What if you avoid wheat?

The corrected table includes non-wheat options such as the specified beet and spinach preparations. You do not need to add wheat germ or bran if wheat is unsuitable for you. Keep the exact food and portion visible, rather than assuming another grain has the same value or using a legacy dry-quinoa figure for a cooked bowl.

For a measured capsule product, the amount is easier to count, but the choice still depends on a reason to supplement. A gram used in a homocysteine trial is not an established daily food requirement. The homocysteine guide explains that distinction.

Preparation and database version belong beside the number

A food-composition value is an analytical estimate for a particular food description. Raw spinach, boiled spinach and a mixed spinach dish have different water contents and preparation histories. A higher concentration per 100 g after cooking can reflect water loss rather than creation of betaine. Use the matching entry and keep the portion calculation visible.

Food analyses identify whole-grain fractions and quinoa among relevant sources, but the amount contributed by a normal meal also depends on the portion actually eaten. Source versions and corrections matter when online tables disagree by large amounts. A precise-looking number without an identifiable preparation or database entry is not the stronger estimate. ^[2]

The eight-person food-versus-supplement experiment measured acute betaine and homocysteine responses. It helps show that food-derived betaine is biologically available. It does not establish that a calculated meal replaces a clinical regimen or prevents disease. ^[5] Food variety and a concentrated capsule should therefore be judged for their actual purposes rather than made into gram-for-gram substitutes.

Food first or a measured capsule?

A varied diet supplies nutrients and foods with broader roles than a single ingredient. A supplement offers a declared amount that is easier to count, but does not replace the whole diet or create a universal need for TMG.

If you prefer a capsule for a defined reason, the DoNotAge Pure TMG review explains the 500 mg unit and daily serving. Read the dosage guide when comparing food estimates, capsule amounts and the different exposures studied in research.

Sources and next steps

Browse the complete 415-publication TMG Data Center for the original studies, methods, disclosures and limitations. The numbered references below identify the sources used for this article; the full library also retains supporting and null evidence.

Continue by question: TMG Supplement: Benefits, Dosage, Safety and Research · TMG Dosage Guide: Study Doses and Capsule Calculations · TMG for Homocysteine: Dose, Results and Limitations · TMG and MTHFR: Methylation, Folate and B12 Explained.

Our recommended TMG product

DoNotAge Pure TMG — 5/5 editorial rating

Our first choice for a straightforward single-active capsule: 500 mg TMG per capsule, a vegan capsule and 60 or 366 capsules. The score assesses the formula, label clarity and practical product choice; clinical evidence is judged separately.

Read the full evidence-led review · View at DoNotAge. Use BB10 for 10% off eligible standalone products; confirm current checkout terms.

Affiliate disclosure: Biohack Blueprint may earn a commission from qualifying purchases. This is a desk-based editorial recommendation, not an independent batch assay or a promise of a health outcome.