About Perilla frutescens
An herb (shiso) rich in rosmarinic acid; the seed is also an ALA omega-3 source. Small trials of leaf extract suggest mild relief of seasonal allergic rhinitis symptoms, but the evidence base is thin and preparations differ.
What Perilla frutescens supports
- May mildly ease seasonal allergy symptoms in small studies
How much Perilla frutescens to take
The RDA prevents deficiency. The effective range is what clinical trials used to actually move the outcome.
Effective
50–300
mg
Rosmarinic-acid-standardized leaf extracts around 50-200 mg have been studied for seasonal allergy symptoms; range is approximate.
Clinical evidence
Limited clinical evidence. A few small allergy trials; evidence thin.