The Study
Inhibitory effect of intravenous lysine infusion on urea cycle metabolism
This study watched what happened to six kids' bodies after they got a special lysine shot. It saw some chemicals went up, but it didn't compare them to kids who didn't get the shot. So we can't say the lysine caused those changes — it just showed a pattern that might be worth looking into more.
Analysis score
Maximum 44 for a cross-sectional study.
Where the score came from
When kids got a special lysine shot, their bodies had trouble turning ammonia into urea, so ammonia built up and weird waste products showed up in their pee.
Where does this study sit?
Reviews of RCTs (Meta-analyses)
Max 100Randomized Trials
Max 90Reviews of Cohort Studies
Max 85Cohort Studies
Max 72Reviews of Case-Control Studies
Max 63Case-Control Studies
Max 58Cross-Sectional & Case Series
Max 50Expert Opinion
Max 526 / 100
Quality score
Snapshots of a population at a single point in time, or descriptions of small groups. Can identify correlations and prevalence, but cannot determine cause and effect.
Key takeaways
Summary
Based on the study abstract and findings.
- 1Yes — even though urea didn’t drop, ammonia rising means the body’s main detox system is struggling, which could be dangerous if it happened for real over time.
- 2Ammonia went up, ornithine and arginine in blood went up, and homocitrulline, putrescine, and orotic acid in urine went up — but urea stayed the same.
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Journal
European Journal of Pediatrics
Year
2004
Authors
T. Kato, M. Sano, N. Mizutani
Related Content
Claims (5)
When healthy children aged 10–14 years receive an intravenous dose of 0.5 mmol/kg of lysine monohydrochloride, their blood ammonia levels rise, plasma ornithine and arginine increase, and they excrete more homocitrulline, putrescine, and orotic acid in urine, indicating a temporary reduction in the function of mitochondrial ornithine transport and ornithine transcarbamylase in the urea cycle.
When healthy children receive lysine through an IV, their blood ornithine and urine putrescine levels rise, indicating a reduction in the ability of mitochondria to transport ornithine.
When healthy children receive lysine through an IV, their urine shows higher levels of orotic acid, indicating a disruption in the urea cycle caused by reduced citrulline production and mitochondrial dysfunction.
When healthy children receive lysine through an IV, their urine contains more homocitrulline, which reflects reduced activity of the ornithine transcarbamylase enzyme in the urea cycle.
When healthy children receive lysine through an IV, their blood arginine levels rise and urea levels stay the same, indicating that the enzyme arginase is less active but urea production does not decrease overall.
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.