Comparison

L-Citrulline vs TMG (Trimethylglycine)

Both are commonly considered for heart health and energy. Here is how they compare and how to choose.

By the Vital Matrix Editorial TeamReviewed by the Vital Matrix Research TeamLast updated June 25, 2026
L-CitrullineA superior nitric oxide booster that outperforms arginine for pumps and endurance.TMG (Trimethylglycine)A methyl-donor cousin of glycine for homocysteine, liver, and power.
Category
Amino Acids
Amino Acids
Evidence
Moderate
Moderate
Best for
Energy, Recovery, Heart health
Heart health, Energy, Liver health
Top benefit
Raises nitric oxide more effectively than arginine
Lowers homocysteine
Typical dose
6–8 g citrulline malate (2:1) or 3–4 g pure L-Citrulline, 30–60 min pre-workout
2.5 g/day for performance; 3–6 g/day studied for homocysteine
Timing
30–60 minutes before exercise
With meals; performance studies often split it into two daily doses
Main caution
GI discomfort at high doses
Fishy body odour at high doses

How to choose

Choose L-Citrulline if your focus is recovery. Choose TMG (Trimethylglycine) if you care more about liver health. Both are reasonable options for heart health and energy.

Can you take them together?

L-Citrulline and TMG (Trimethylglycine) have no notable direct interaction, so they can generally be taken in the same routine. They are compared here because they are often considered for the same goals.

Frequently asked

What is the difference between L-Citrulline and TMG (Trimethylglycine)?

L-Citrulline is a superior nitric oxide booster that outperforms arginine for pumps and endurance. TMG (Trimethylglycine) is a methyl-donor cousin of glycine for homocysteine, liver, and power.

Should I take L-Citrulline or TMG (Trimethylglycine)?

Choose L-Citrulline if your focus is recovery. Choose TMG (Trimethylglycine) if you care more about liver health. Both are reasonable options for heart health and energy.

Can I take L-Citrulline and TMG (Trimethylglycine) together?

L-Citrulline and TMG (Trimethylglycine) have no notable direct interaction, so they can generally be taken in the same routine. They are compared here because they are often considered for the same goals.

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