# Betaine Anhydrous (TMG)

**Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/betaine-anhydrous-tmg
**Data Source:** Hermetica Superfoods Ingredient Encyclopedia
**Updated:** 2026-03-18
**Evidence Score:** 8 / 10
**Category:** Other
**Also Known As:** N,N,N-trimethylglycine, TMG, Glycine betaine, Trimethylammonioacetate, Lycine, Oxyneurine, Abromine

## Overview

Betaine anhydrous (trimethylglycine) functions as a methyl donor and osmolyte, supporting cellular hydration and [energy metabolism](/ingredients/condition/energy). It increases muscle creatine levels through methionine recycling pathways, enhancing power output and strength performance.

## Health Benefits

- Enhances power output by increasing muscle creatine levels, which fuels explosive movements. This results in improved performance in high-intensity activities. - Supports hydration and cell volumization, leading to better muscle pumps and endurance. - Boosts strength by promoting protein synthesis, which aids in muscle growth and repair. - Reduces fatigue by lowering homocysteine levels, improving overall [energy metabolism](/ingredients/condition/energy). - Enhances [cognitive function](/ingredients/condition/cognitive) by supporting neurotransmitter synthesis, which improves focus and mental clarity. - Promotes heart health by supporting healthy homocysteine levels, reducing [cardiovascular risk](/ingredients/condition/heart-health). - Improves [body composition](/ingredients/condition/weight-management) by supporting fat loss while preserving lean muscle mass.

## Mechanism of Action

Betaine anhydrous donates methyl groups to homocysteine via betaine-homocysteine methyltransferase (BHMT), regenerating methionine for creatine synthesis. As an osmolyte, it maintains cellular fluid balance by accumulating in cells during dehydration stress. The increased methionine availability enhances creatine phosphate stores, fueling the ATP-PCr energy system during high-intensity exercise.

## Clinical Summary

Multiple randomized controlled trials with 12-23 participants show 2.5g daily betaine increases power output by 17-25% and total training volume by 6.5% over 1-2 weeks. A 6-week study demonstrated 4% increases in bench press power and 5% improvements in squat power with 1.25g twice daily. However, some studies show minimal effects on [body composition](/ingredients/condition/weight-management), and research is limited by small sample sizes and short durations.

## Nutritional Profile

Betaine Anhydrous (TMG) is a trimethyl derivative of the amino acid glycine (chemical formula: C5H11NO2, MW: 117.15 g/mol). It is not a macronutrient source — zero protein, fat, or carbohydrate contribution at typical supplemental doses. Key bioactive compound: trimethylglycine at 100% concentration in anhydrous form (no water of crystallization). Typical supplemental doses range from 1,500–6,000 mg/day, with 2,500 mg/day being the most studied ergogenic dose. Contains three methyl groups per molecule, making it a potent methyl donor in one-carbon [metabolism](/ingredients/condition/weight-management). Acts as an osmolyte, stabilizing intracellular water balance at physiological concentrations of approximately 1–5 mM in human tissues. Naturally found in beets (~150–300 mg/100g fresh weight), spinach (~600–645 mg/100g), quinoa (~390 mg/100g), and wheat germ (~1,240 mg/100g). No significant vitamin or mineral content in isolated supplement form. Bioavailability: highly bioavailable orally, with peak plasma concentrations reached within 60–90 minutes post-ingestion; absorption occurs primarily in the small intestine via sodium-dependent transport mechanisms. Plasma betaine levels increase dose-dependently, with chronic supplementation (2,500 mg/day for 14 days) elevating plasma levels from a baseline of approximately 40–50 µmol/L to 200–300 µmol/L.

## Dosage & Preparation

Dosages typically range from 1.5 to 3 grams per day. Consult a healthcare provider before use.

## Safety & Drug Interactions

Betaine anhydrous is generally well-tolerated with mild side effects including nausea, stomach upset, and diarrhea at doses above 4g daily. It may increase homocysteine levels in individuals with MTHFR gene variants, potentially affecting [cardiovascular health](/ingredients/condition/heart-health). No significant drug interactions are documented, but it may enhance the effects of methylation-dependent medications. Safety during pregnancy and breastfeeding has not been established.

## Scientific Research

Studies suggest Betaine Anhydrous can enhance muscle endurance and strength, with some evidence from RCTs supporting its efficacy.

## Historical & Cultural Context

Traditionally, betaine has been used in animal feed to improve growth and performance.

## Synergistic Combinations

Creatine, Whey Protein, Electrolytes

## Frequently Asked Questions

### What is the optimal betaine anhydrous dosage for muscle performance?

Research supports 2.5g daily taken as a single dose or split into 1.25g twice daily. Studies showing performance benefits used doses ranging from 1.25-2.5g daily for 1-6 weeks.

### How long does betaine anhydrous take to work for strength gains?

Power output improvements can occur within 1-2 weeks of supplementation at 2.5g daily. Maximum strength and muscle volume benefits typically develop after 6-8 weeks of consistent use.

### Can betaine anhydrous be taken with creatine monohydrate?

Yes, betaine and creatine work synergistically since betaine supports endogenous creatine synthesis through methionine recycling. Taking both together may provide superior strength and power benefits compared to either supplement alone.

### Does betaine anhydrous cause water retention or bloating?

Betaine may cause mild intracellular water retention that enhances muscle volumization rather than subcutaneous bloating. This osmolytic effect contributes to improved muscle pumps and performance rather than uncomfortable water gain.

### Is betaine anhydrous the same as betaine HCl for digestion?

No, betaine anhydrous (trimethylglycine) is used for athletic performance and methylation support, while betaine HCl contains hydrochloric acid for digestive support. They have different mechanisms and cannot be used interchangeably.

### What foods naturally contain betaine anhydrous, and can I get enough from diet alone?

Betaine is found naturally in foods like beets, spinach, quinoa, and whole grains, with beets being the richest source. However, achieving the performance-enhancing dose of 2.5 grams daily through diet alone would require consuming impractically large quantities of these foods. Supplementation with betaine anhydrous is the most practical way to reach therapeutic levels for athletic performance benefits.

### Does betaine anhydrous interact with common medications or blood pressure drugs?

Betaine anhydrous is generally well-tolerated with minimal documented drug interactions, though individuals taking blood pressure medications should consult their healthcare provider since betaine may have mild cardiovascular effects. Betaine's role in lowering homocysteine could theoretically interact with B-vitamin medications, but clinically significant interactions are rare at standard supplemental doses. Always inform your doctor about betaine supplementation if you're on prescription medications.

### Who benefits most from betaine anhydrous supplementation, and who should avoid it?

Betaine anhydrous is most beneficial for athletes engaged in high-intensity strength training, powerlifting, and explosive sports where muscle power output is critical. Pregnant and nursing women should avoid betaine supplementation due to limited safety data in these populations. Individuals with kidney disease or those prone to elevated homocysteine levels should consult a healthcare provider before use, as betaine's metabolic effects may require medical oversight.

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