Nasaleze Ltd works to ISO 13485:2003 and ISO 9001:2000 to produce 15,000units a day with a fully trained staff. Each bottle dispences 200 puffs of Nasaleze powder which is enough to last for 6 to 8 weeks of daily use. The powder is inert and has no medical properties so is entirely safe for all to use It works because the powder turns to a gel like material on contact with the moisture which is always present in the nasal tract. This gel mimics nasal tract mucus which is the essential filtration medium which is often missing or of a poor quality in people who suffer from allergic reactions in the respiratory system. There are no known side effects.