Herb Pharm Pleurisy Root Liquid Herbal Extract Description. Liquid Herbal Extract. Asclepias Tuberosa. Butterfly Weed. We prepare our Pleurisy Root Extract from the roots of Asclepias tuberosa plants which are Certified Organically Grown on our own farm without the use of chemical fertilizers pesticides or herbicides or are Custom Wildcrafted in their native wild habitat. To assure optimal extraction of Pleurisy Roots bioactive compounds the roots are hand-dug only in late autumn or early spring are carefully shade-dried and are then thoroughly extracted. Our Pleurisy Root is never fumigated or irradiated. Disclaimer These statements have not been evaluated by the FDA. These products are not intended to diagnose treat cure or prevent any disease. Shake well before using. Two to four times per day take 30 to 40 drops in a little water Ingredients: Certified organic grain alcohol distilled water and pleurisy root extractives.