Homocysteine Support

TMG (Betaine) and Methylation Support

TMG (betaine) is a methyl donor involved in normal homocysteine metabolism. Here is a plain-English guide to what it does.

By Cardio Guardian Editorial TeamReviewed by Cardio Guardian Editorial TeamPublished July 3, 20264 min read

TMG — short for trimethylglycine, and also known as betaine — is a compound that donates a methyl group in the body’s methylation cycle, which is part of how the body supports healthy homocysteine metabolism. Here is the simple version of what that means, without any disease claims.

What TMG is

TMG occurs naturally in foods; its other name, betaine, comes from beets, where it was first identified. The body also makes betaine from choline. As a supplement ingredient, it is a nutrient, not a medication.

What a “methyl donor” does

Think of the methylation cycle as a small recycling loop. Within it, TMG donates a methyl group that helps convert homocysteine back into methionine — one of the steps that keeps homocysteine metabolism running normally. That donation is why TMG is grouped with the active B vitamins on a label. To see how these pieces fit into the product, read about the science behind the formula.

TMG and choline

TMG and choline are related: the body can convert choline into betaine, and both are involved in normal methylation. That connection is why you will sometimes see them discussed together.

What Cardio Guardian includes

Cardio Guardian provides 500 mg of TMG (betaine anhydrous) in each 3-capsule daily serving, alongside active B6, methylfolate, and methyl-B12 — the nutrients that work together in the methylation cycle.

The bottom line

TMG is a methyl donor with a clear role in the methylation cycle that supports healthy homocysteine metabolism already within a normal range. It is one part of a broader formula, and nothing here is medical advice.

Frequently Asked Questions

What is TMG?

TMG (trimethylglycine), also called betaine, is a compound that acts as a methyl donor in the body's methylation cycle.

What does TMG do in the body?

It donates a methyl group that helps recycle homocysteine, supporting healthy homocysteine metabolism already within a normal range.

How much TMG is in Cardio Guardian?

Each 3-capsule daily serving provides 500 mg of trimethylglycine (betaine anhydrous).

References & Further Reading

1. National Institutes of Health — Office of Dietary Supplements: Choline
2. National Institutes of Health — Office of Dietary Supplements: Folate
3. National Institutes of Health — Office of Dietary Supplements: Vitamin B12