Since 1972. Verbena hashtag. Discover Nature's Answer. Made from 2000 mg blue vervain whole herb per serving. Low alcohol. Bio-chelated cold extraction process. Our alcohol extracts are produced using our cold bio-chelated proprietary extraction process, yielding a holistically balanced advanced botanical fingerprint extract in the same synergistic ratios as in the plant. Bio-chelated cold extraction process. Absolutely no preservatives.