"Supercritical" means Super Purity, Super Potency, Broad Spectrum, and No Chemical Solvents. New Chapter takes nature's finest herbs and then extract and highly concentrate (as high as 250 to 1) their precious ingredients. New Chapter does not isolate out single ingredients or spike their extracts with synthesized additives. New Chapter delivers the wisdom of nature with the complexity and organic nuances of the natural herb preserved for you. In fact, for herbs with a high resinous or essential oil content, the supercritical process extracts more beneficial organic antioxidants and other lipophilic compounds than any other extraction process. And when you take New Chapter's supercritical extracts, neither you, nor the environment, have to contend with chemical solvents.