Ornithine and exercise
What 2 graded rows on ornithine agree on for exercise, and where they differ. Counted side by side, never averaged.
Consensus finder Rows from the Ornithine page, reviewed Oct 21, 2026 How it decides
What the rows agree on
Each block and row is one graded row from the Ornithine page, with its PubMed record.
Your question
Ornithine and exercise
2 rows · 33 peopleSplit. 1 row found an improvement and 1 found no difference.
- DGrade D× 2
- Rows
- 2
- Trials
- 2
- People
- 33
Where they differ
From the rowsThe best-graded row, grade D, is a randomized trial of 17 people (2010) and found an improvement.
The row that found an improvement ran longer (3 weeks) than the row that found no difference (2 weeks).
Only the row that found an improvement names athletes or trained people in its population. Only the row that found no difference names men in its population.
The row that found no difference is newer (2025) than the row that found an improvement (2010).
The rows
1 improved · 1 no difference- DGrade DGrowth hormone and IGF-1 after resistance exercise (with arginine) · Improved
RCT · n 17 · 2010 · Experienced strength-trained athletes
Not stated in the abstract · 3 weeks of heavy-resistance training
Growth hormone and IGF-1 were higher after exercise in the supplemented group; resting hormones, testosterone, cortisol and insulin did not differ from placebo.
- DGrade DBlood ammonia and cycling performance (with tea catechins) · No difference
Crossover RCT · n 16 · 2025 · Healthy young men
Single dose and 14 days of daily intake (amounts not stated in the abstract) · 14 days per period
No effect on exercise-induced ammonia or on power output in a 15-minute cycling test; perceived fatigue during 60 minutes of cycling was lower than with placebo.