Parsley Leaf
Also known as: Petroselinum crispum, garden parsley, curly parsley
Effective Dosage
No established dose (insufficient research data)
What the Science Says
Parsley leaf is a common culinary herb derived from Petroselinum crispum. Animal studies suggest it may have antioxidant properties and could help reduce liver fat accumulation in high-fructose diets, and may offer some protective effects in diabetic conditions. However, these findings come exclusively from rat studies, and there is currently no reliable human clinical evidence supporting these effects.
What It Doesn't Do
Won't lower your blood pressure — the only human trial found no clinically useful antihypertensive effect. Not a proven diuretic for kidney or urinary tract conditions. Animal study results do not automatically translate to humans. No proven benefit for liver health, blood sugar, or antioxidant status in people.
Evidence-Based Benefits
Parsley leaf is traditionally used for its potential antioxidant and anti-inflammatory properties. Some studies suggest it may support digestive health and provide vitamins and minerals, but evidence is limited and not robust.
Weak EvidenceEffective at: Unknown (insufficient research data)
Source: auto-research
Absorption & Bioavailability
Unknown — no human pharmacokinetic or bioavailability data provided in the available studies
Red Flags to Watch For
- The only human clinical trial found no blood pressure benefit and reported kidney-related adverse events, causing 7 of 163 participants to drop out early
- Nearly all positive findings come from rat studies — these do not reliably predict effects in humans
- Doses used in animal studies (2 g/kg body weight) are extremely high and not directly translatable to human supplement doses
- Over 1,000 supplement products contain parsley leaf despite a near-total absence of human clinical evidence
- May be contraindicated in people with kidney inflammation or urinary tract conditions based on the adverse event profile in the one human trial
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: 2026-04-06