# Betaine Fatigue Randomized Trial: What the Evidence Says
Canonical: https://www.migaku.app/guides/betaine-fatigue-randomized-trial-evidence-review
Category: evidence-review
Summary: Betaine Fatigue Randomized Trial has 2 source documents in the current Migaku evidence database. The strongest available sources in this first pass are system
Last reviewed: 2026-08-07
Reviewed by: Migaku Evidence Review
# Betaine Fatigue Randomized Trial: What the Evidence Says

## Quick Answer

Betaine Fatigue Randomized Trial has 2 source documents in the current Migaku evidence database. The strongest available sources in this first pass are systematic review, so conclusions should be framed as evidence-aware guidance rather than medical advice.

## Key Takeaways

- This page is generated only from sources stored in the Migaku evidence knowledge base.
- Current evidence mix: 1 systematic review, 1 research article.
- Claims should be interpreted with the source type, study design, population, and publication date in mind.
- This article is educational and does not replace care from a qualified clinician.

## Evidence Map

| Source | Evidence type | Level | Date | Identifier |
| --- | --- | ---: | --- | --- |
| Multifactorial Thresholds of Psychomotor Fatigue in Soccer: A Systematic Review and Meta-Analysis of Randomized Controlled Trials | systematic review | 1 | 2026-04-02 | 10.5114/jhk/212912 |
| Betaine Supplementation Improves 60 km Cycling Time Trial Performance and One-Carbon Metabolism in Cyclists During Recovery | research article | 4 | 2025-08-26 | 10.3390/nu17172765 |

## What The Sources Report

- The dynamic nature of soccer, where tactical and physical demands uniquely interact in each match, requires a rigorous analysis of how various forms of fatigue interact and affect decision making, skill execution, and injury risk. [Gnanasigamani Moses (2026); evidence level 1]
- Shortened off-seasons exacerbate this issue, leaving players with insufficient time to fully recover, which heightens the risk of cumulative fatigue and injuries. [Gnanasigamani Moses (2026); evidence level 1]
- Plasma betaine concentrations are inversely associated with cardiovascular events, and higher levels have been linked to a pattern of favorable lifestyle habits and leanness. [Nieman David C. (2025); evidence level 4]
- The ergogenic and clinical effects of betaine have been investigated with doses ranging from 0.5 to 20 g/d, with 1.5-6 g/d found to be sufficient to increase plasma betaine and methionine concentrations and lower homocysteine within 2 weeks. [Nieman David C. (2025); evidence level 4]

## How To Read This Evidence

Evidence level 1 generally reflects systematic reviews or meta-analyses. Level 2 includes randomized trials, guidelines, or public-health guidance. Level 3 usually reflects observational or narrative-review evidence. Level 4 is weaker or early-stage evidence. The level is a sorting aid, not a final quality grade.

## Practical Interpretation

There is at least one systematic-review style source in the current set, so it deserves more weight than single-study evidence. For betaine fatigue randomized trial, the next editorial step is to add more targeted sources and separate strong findings from early or indirect evidence.

## Limits Of This First Pass

This is a small-batch MVP article. It uses the first ingested sources for this topic and should be expanded with more targeted searches, license review, and human editorial checks before being treated as a definitive review.

## References

- Gnanasigamani Moses (2026). Multifactorial Thresholds of Psychomotor Fatigue in Soccer: A Systematic Review and Meta-Analysis of Randomized Controlled Trials. DOI: 10.5114/jhk/212912. PMCID: PMC13112161. PMID: 42051612. License: CC BY 4.0. https://pmc.ncbi.nlm.nih.gov/articles/PMC13112161/
- Nieman David C. (2025). Betaine Supplementation Improves 60 km Cycling Time Trial Performance and One-Carbon Metabolism in Cyclists During Recovery. DOI: 10.3390/nu17172765. PMCID: PMC12430687. PMID: 40944155. License: CC BY 4.0. https://pmc.ncbi.nlm.nih.gov/articles/PMC12430687/

## Safety Note

Health information can change, and individual risk depends on medical history, medications, pregnancy status, age, and diagnosis. Talk with a qualified clinician before changing treatment, supplement, or medication routines.