Last verified: 43 days ago
Parsley Leaf
Also known as: Petroselinum crispum, garden parsley, common parsley
Evidence under review. — Not yet rated
Common culinary herb with very limited human evidence. Animal studies show some promise, but human data is lacking.
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What it does
Parsley leaf is a widely used culinary herb derived from Petroselinum crispum. Animal studies suggest it may have antioxidant properties and could help reduce fat accumulation in the liver when...
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Evidence quality
Evidence base hasn't been formally rated yet. See research below.
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Clinical dose
No established dose (insufficient research data)
What the Science Says
Parsley leaf is a widely used culinary herb derived from Petroselinum crispum. Animal studies suggest it may have antioxidant properties and could help reduce fat accumulation in the liver when diet-induced. One rat study also indicated it might help manage blood sugar levels in diabetic pregnancy models. However, these findings come exclusively from animal research, and there is currently no reliable human clinical evidence supporting these effects.
What It Doesn't Do
Does not lower blood pressure — a clinical trial found a parsley-containing product was no better than placebo for hypertension. Not a proven diuretic for human use. No human evidence it treats liver disease, diabetes, or kidney stones. Don't expect it to replace any prescribed medication.
Evidence-Based Benefits
Parsley leaf is a widely used culinary herb derived from Petroselinum crispum. Animal studies suggest it may have antioxidant properties and could help reduce fat accumulation in the liver when diet-induced. One rat study also indicated it might help manage blood sugar levels in diabetic pregnancy models. However, these findings come exclusively from animal research, and there is currently no reliable human clinical evidence supporting these effects.
Weak EvidenceEffective at: No established dose (insufficient research data)
Source: auto-research
Absorption & Bioavailability
Unknown — no human pharmacokinetic data available from the provided studies
Red Flags to Watch For
- A clinical trial found a parsley-containing supplement caused kidney-related side effects, leading 7 of 163 patients to drop out early
- All positive findings come from animal studies — results may not translate to humans
- Widely used in supplements despite near-zero human clinical trial data
- Contraindicated in people with kidney inflammation or urolithiasis based on the one available human trial
- Over 1,000 supplement products contain parsley leaf despite the weak evidence base
Products Containing Parsley Leaf
See how Parsley Leaf is used in these analyzed products:
Research Sources
- PubMed
- NIH DSLD
This information is for educational purposes only and is not medical advice. Always consult a healthcare professional before starting any supplement regimen. Last updated: 2026-04-09