Contains 250ml 'Peroxygen', guaranteed aseptic, food grade hydrogen peroxide 35% with a dropper. Also 5 litres of our own pure steam distilled water and 30 days supply of Udos Super 8 high potency pro-biotic to re-populate the good bacteria in the gut, which is an absolute must after a course of hydrogen peroxide ingestion. Save £5 when buying this boxed set.