That depends largely on the type of symptoms. Some changes are seen after 2 to 3 days, namely loss of around 2 kg of weight due to release of inflammation related excess water. Digestive symptoms start to improve after 3 to 5 days. Generally, patients report that they feel much better after 3 to 5 days. However, some symptoms, like arthritis or more severe immunological diseases, may take weeks to see a result. And some of your symptoms may not go away because they originate from something other than food hypersensitivities. These include certain defects in the intestinal flora, enzyme defects, and hormonal problems (particularly in women). Other sources can be environmental contaminants, heavy metal burden, and dental metals. All these causes cannot be detected with ImuPro.