Polyphenol
Rosmarinic Acid
A plant compound with antioxidant and neuroprotective properties found in herbs like rosemary.
KÖGN Health grades Rosmarinic Acid as B (Moderate evidence) and rates it 3.6 out of 5.
Last reviewed · June 2026
Primary effects
- Neuroprotection
- Reduced inflammation
- Cognitive support
How it works
Reduces oxidative stress and supports neurotransmitter balance.
Overview
Rosmarinic Acid is a polyphenol found in several aromatic herbs, particularly rosemary and lemon balm. It has been studied for its antioxidant and anti-inflammatory effects, which may support brain health over time. However, direct human evidence for cognitive enhancement is still limited, and its effects are considered subtle and supportive rather than performance-driven.
The evidence
Rosmarinic acid is a polyphenol found in lemon balm, rosemary and sage, with antioxidant and anti-inflammatory activity. The calming and cognitive signals attributed to it largely come from whole-herb studies (especially lemon balm) rather than trials of the isolated compound, and standalone human evidence is limited. It is best understood as part of why those herbs may help, not a proven nootropic on its own.
How to dose it
No well-established isolated human dose exists; intake usually comes via standardised lemon balm or rosemary extracts.
When to take it
Acute-to-chronic — uncertain, given the herb-level evidence.
Safety & side effects
Generally well tolerated at the levels found in herbal extracts.
Who should avoid it
Few specific issues; apply the cautions for its source herb (see Lemon Balm), including care with sedatives and in pregnancy. Evidence for the isolated compound is limited.
References
Related ingredients
Graded entries that target the same cognitive goals.
Categories
Draft — the dose, safety and evidence notes on this entry were prepared from the published literature and are pending editorial and clinical review.
Educational information, not medical advice. The evidence grade is KÖGN’s editorial assessment of published research, not a health claim. Speak to a qualified clinician before changing what you take.