The world of sports nutrition has gained another popular supplement: Trimethylglycine (TMG), which promises greater muscle strength and better endurance.
In fitness centers and online forums, TMG is increasingly mentioned as a miracle solution for better athletic performance, but what is scientifically known about this?
The 5 Key Takeaways
- TMG may possibly improve strength in the lower limbs, but results for upper body strength are not convincing.
- Research shows that TMG can improve muscle endurance during strength training.
- The safe dose of TMG is around 2.5 grams per day, divided into two doses.
- TMG has no clearly proven effect on muscle growth, although theoretical mechanisms exist.
- Compared to creatine, TMG is less well researched and may offer no additional benefits when used in combination.
What is TMG Anyway?
TMG, also known as betaine, is a natural compound found in our bodies and in foods like spinach and beets. This substance plays an important role as a methyl group donor in our body.
The Scientific Mechanism of TMG
TMG has two important functions in the body: it helps convert homocysteine to methionine (an amino acid that is important for muscle growth) and acts as an osmolyte that regulates water balance in cells. Because TMG contributes to creatine production and methylation processes, it may have a beneficial effect on athletic performance.
Pros
- Possibly improved strength in the lower limbs
- Better muscle endurance during strength training
- Improved repeated sprint ability in team sports
- Possibly faster recovery after intense training
Cons
- Digestive issues at higher doses
- Possible increase in LDL cholesterol
- Not suitable for people with kidney or heart disease
- Inconsistent research results on effectiveness
TMG and Athletic Performance: What Does Science Say?
A recent meta-analysis shows that TMG has a significant positive effect on maximum lower body strength after a supplementation period of at least 7 days. Nevertheless, research shows that the effect on upper body strength is much less clear.
TMG appears to be especially effective for improving endurance and the ability to sprint repeatedly. In soccer players, after 14 weeks of use, improvements in running speed and sprint ability were observed, which according to experts is certainly interesting for team sport athletes.
A Boost for Your Muscle Growth?
Although TMG could theoretically support muscle growth through its involvement in methionine production and strengthening anabolic signaling pathways, the evidence for this is not clear-cut. Studies sometimes report an increase in lean mass, but other research could not confirm this.
The inconsistent results suggest that factors such as training intensity, diet, and individual genetic differences may play a larger role than supplementation alone. For those hoping for faster muscle growth through TMG, it’s good to temper expectations.
Safe Use: Dosage and Side Effects
TMG is generally considered safe, but can cause side effects at high doses (above 4 grams per day). Possible complaints include digestive problems such as diarrhea, nausea, and bloating.
The typical dosage for athletic performance is around 2.5 grams per day, divided into two doses. Preferably start with a lower dose to test your tolerance and take TMG preferably with food to reduce digestive issues.
Glossary
- Trimethylglycine (TMG): A natural compound that acts as a methyl group donor in the body, also known as betaine
- Methylation: A biological process in which a methyl group is added to a molecule
- Osmolyte: A substance that helps regulate water balance in cells
- Ergogenic aid: A substance that can improve performance
TMG Versus Other Supplements
TMG is often compared to creatine, since both work as osmolytes. However, research has shown that TMG has no additive effect when used together with creatine, suggesting that people already using creatine will likely not experience additional benefits.
Compared to other ergogenic aids, the evidence for TMG is less robust. However, some athletes swear by the unique benefits of TMG for their performance, especially in terms of endurance and recovery after intense training.
Also Read: Creatine Calculator New Dosage 2025
Health Benefits Beyond Sports
In addition to possible benefits for athletic performance, TMG is also being researched for health effects. For example, TMG can help lower blood homocysteine levels, which may be beneficial for heart and blood vessel health.
These broader health benefits make TMG an interesting supplement, even for people not primarily seeking athletic improvement. Nevertheless, it is important to have realistic expectations and not view it as a miracle cure.
Conclusion
The scientific literature on TMG shows a mixed picture, with some aspects of athletic performance appearing to improve, but the effects on muscle growth being less clear. The current hype surrounding TMG in fitness and bodybuilding therefore does not seem entirely justified.
TMG is certainly not a miracle cure, but can be useful for specific goals such as improving muscle endurance. Those who want to try TMG would be wise to start with a low dose, have realistic expectations, and view the supplement as a complement to—not a replacement for—a good training and nutrition program.
Verified Sources
- bodybuilding.com – Article on the effects of Betaine according to a supplement expert
- bodybuilding.com – Jim Stoppani’s expert guide to Betaine
- naturalhealthresearch.org – Study on Betaine in female athletes
- tandfonline.com – Research on Betaine and muscle endurance
- digitalcommons.lib.uconn.edu – UCONN thesis on Betaine and athletic performance
- pmc.ncbi.nlm.nih.gov – Betaine and muscle growth after CrossFit training
- healthsciences.iff.com – Information on the BetaPower Betaine product
- learnmuscles.com – Article on TMG and athletic performance
- pmc.ncbi.nlm.nih.gov – Effect of Betaine on strength and fatigue
- vitality-pro.com – Overview of TMG: benefits, dosage and risks
- healthline.com – Explanation of TMG supplements and how they work
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Frequently Asked Questions
Is TMG Safe to Use?
TMG is generally considered safe at recommended doses of approximately 2.5 grams per day. At higher doses, digestive issues may occur, and use is not recommended for people with heart or kidney disease.
When Can I Expect Results from TMG?
Research shows that the potential benefits of TMG become noticeable only after about two weeks of consistent use. For maximum effect, long-term and consistent use is recommended.
Can TMG Help with Fat Loss?
There are some studies suggesting that TMG may contribute to a reduction in body fat, but the results are not consistent. It is certainly not a replacement for a healthy diet and adequate exercise.
Should I Take TMG Before or After Training?
Taking TMG before a workout might provide maximum performance benefit. Taking it with food can help reduce any digestive issues.
Is TMG Better Than Creatine for Strength Athletes?
Creatine remains the gold standard for improving strength and power. Research has shown that TMG provides no additional benefits when combined with creatine, suggesting it is not better.
