USDA Organic Herbal Supplement Turmeric Liquid Extract Certified Organic by Organic Certifiers We prepare our Turmeric Extract from the rhizome of Certified Organically Grown Curcuma longa plants. To assure optimal extraction of Turmeric's bioactive compounds, the rhizomes are hand-harvested when fully mature, are carefully processed and dried to retain their full color and aroma, and are then shipped directly to our laboratory for thorough extraction.