Psyllium is one of our most popular herbs. Lack of dietary fibre is a common problem in modern diets, a problem that is easily fixed with a psyllium supplement. The soluble fibre found in psyllium husk absorbs water and swells up to ten times its original volume. This property helps it to relieve both constipation and diarrhea. Studies have shown that psyllium can also lower overall cholesterol as well as LDL (â€œbadâ€) cholesterol levels.