Soy sauce: do you add it in the beginning or the end? Allowing soy sauce to boil in a wok at a high temperature for long will damage its nutrition and deprive it of all freshness; therefore, it’s better to add soy sauce only when you are ready to serve. Special Tips: Patients who are taking medicine to treat vascular diseases, gastrointestinal diseases or tuberculosis should not take too much soy sauce. ……