Betaine (Trimethylglycine)

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Also indexed as:

TMG

Betaine (trimethylglycine) functions very closely with choline, folic acid, vitamin B12, and a form of the amino acid methionine known as S-adenosylmethionine (SAMe).^{1, 2} All of these compounds function as "methyl donors." They carry and donate methyl molecules to facilitate necessary chemical processes. The donation of methyl groups by betaine is very important to proper liver function, cellular replication, and detoxification reactions. Betaine also plays a role in the manufacture of carnitine and serves to protect the kidneys from damage.³ Betaine is closely related to choline. The difference is that choline (tetramethylglycine) has four methyl groups attached to it. When choline donates one of these groups to another molecule, it becomes betaine (trimethylglycine). If betaine donates one of its methyl groups, then it becomes dimethylglycine.

Where is it found?

Dietary sources of betaine include fish, beets, and legumes. Betaine is most widely available as betaine hydrochloride (betaine-HCl), but that form is used primarily as a source of hydrochloric acid for people with hypochlorhydria (low stomach acid). The forms used specifically to provide betaine are betaine citrate and betaine aspartate. These forms have also been used to improve liver function.

Health Concerns

Betaine has been used in connection with the following conditions (refer to the individual health concern for complete information):

Rating	Health Concerns
	Alcohol-induced fatty liver Hepatitis (nonalcoholic steatohepatitis) Homocysteine (high)
	Atherosclerosis
Reliable and relatively consistent scientific data showing a substantial health benefit. Contradictory, insufficient, or preliminary studies suggesting a health benefit or minimal health benefit. An herb is primarily supported by traditional use, or the herb or supplement has little scientific support and/or minimal health benefit.

Deficiency Symptoms

Who is likely to be deficient?

Betaine is not an essential nutrient, and thus no deficiency state exists.

Dosage

How much is usually taken?

For people with alcohol-induced fatty liver, the recommended amount for betaine citrate or betaine aspartate supplementation is 1,000 to 2,000 mg three times daily. Lower amounts are often used as nutritional support for general liver health, although use of betaine in this manner has not undergone clinical research.

Side Effects

Are there any side effects or interactions?

No side effects with betaine at recommended levels have been noted.

At the time of writing, there were no well-known drug interactions with betaine.

References

1. Selhub J. Homocysteine metabolism. Annu Rev Nutr 1999;19:217-46 [review].
2. Barak AJ, Tuma DJ. Betaine, metabolic by-product or vital methylating agent? Life Sci 1983;32:771-4 [review].
3. Chambers ST. Betaines: their significance for bacteria and the renal tract. Clin Sci 1995;88:25-7 [review].

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Last Review: 09-01-2007

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