Big effect
L-arginine was linked to a 77% lower risk of severe pre-eclampsia in a meta-analysis, but the evidence is rated low-certainty and based on small trials.
This is a very large effect, but it comes from a handful of small prevention trials where the quality of the evidence is low, so the real-world benefit is far from settled.
A meta-analysis pooling 2,028 pregnant women found that taking L-arginine was associated with a 77% lower risk of developing severe pre-eclampsia (a dangerous complication of pregnancy involving high blood pressure and organ damage). The same analysis also found L-arginine lowered systolic blood pressure and reduced the risk of fetal growth restriction, but it did not significantly reduce overall pre-eclampsia risk or blood pressure more broadly. Because the underlying trials were small and the evidence is rated low-certainty, these striking numbers should be taken as promising but not definitive.
Where this fits in the evidence
This is among the first studies we've indexed on L-Arginine for Reduced Risk of Severe Pre-eclampsia — treat it as an early signal until more research accumulates.
The study
- Meta-Analysis
- n = 2,028
- 2025-01-12
- BJOG : an international journal of obstetrics and gynaecology
This is a plain-language summary of a research finding, not medical advice. Pillser surfaces research signals to help you decide what's worth investigating — always consult a qualified professional before changing what you take.