Tinctures are cannabis infusions made with oil, alcohol or glycerin. They are mostly used sublingually, though it is possible to add them to food or drinks. Using them to infuse food will alter their effects. Sublingual use results in cannabinoids being absorbed into the bloodstream via the sublingual artery. Tincture effects take approximately 30 minutes to be felt and the effects are generally sustained for about 2 hours. Tinctures are excellent alternatives to inhalation and offer precise dosing options. A standard eyedropper dispenses 0.05 mL per drop, meaning there are 20 drops in 1 mL of medication.