Full Extract Cannabis Oil, FECO is a dark, thick oil packaged in a syringe for easier dosing and is consumed orally. FECO, or full-spectrum extract, contains all active chemicals found in the cannabis plant. This potent extract has high concentrations of cannabinoids and other compounds. FECO is typically administered sublingually; a small amount of oil is smeared on the gums or under the tongue where it can be gradually absorbed into the bloodstream. Its effects are strong and long-lasting with a slow release/onset.