Popular TV presenter and doctor Sergei Malozyomov in his new book simply and clearly explains how our immunity works and by what means we can strengthen it. Can medications, herbs, or certain foods stimulate the activity of the defense system - what has research on this topic shown? How can you realistically change your lifestyle to reduce the risk of allergies? What supplements do doctors themselves take to help them get sick less often? And how should you feel about vaccinations – which ones are given in different countries, and when should you refrain from doing so?