Shiso / Perilla Frutescens Leaf Extract

Supplier-disclosed industry ranges are typically 10–30 kg with 4–8 week lead times. Harvest is concentrated in July–September, but extract producers typically work from stored or frozen feedstock to maintain year-round supply. For brands wanting fresh-season material with declared harvest date, RFQ should be placed by spring of the target year.

Yes. Reputable Japanese herb extract producers will standardize Perilla frutescens leaf extract to a specified rosmarinic acid content using HPLC, with batch-level COA reporting. Standardized extracts carry a price premium versus generic 'shiso extract.' For functional positioning that references the rosmarinic acid clinical literature, standardized material is generally required for credible claims-substantiation.

Aichi Prefecture is one of Japan's leading commercial shiso production areas, supplying both green and red varieties; Tottori and Nagano are secondary regions. Organic JAS-certified shiso is produced in limited volume by specialty growers and contract herb farms, with chain-of-custody documentation through the extract producer. Confirm certification scope (raw leaf vs finished extract) at RFQ.