Hopzoil is a pure essential oil made from fresh hops.  It is the result of taking fresh wet hops at harvest time and steam-distilling them right on the farm, minutes after harvest.  This very different extraction method captures all of the essential oils found in fresh hops at the peak of ripenesss.  This method is distinctly different from traditional liquid extracts in both the raw ingredient (fresh hops vs. dried, processed hops) and the process.  Because it is steam-distilled and not processed using a CO₂, ethanol or other solvent-based extraction method, there is no chance of residual solvent.  It contains one active ingredient: pure hop oil.