It is normal for thal minors to have high bilirubin levels, as there is a higher than normal turnover in red blood cells. Bilirubin is a by-product of hemoglobin as it breaks down. Eating healthy diet can help a bit, but there isn't much you can do about the levels, as the red cell destruction is constant. Folic acid, B complex and magnesium may help to extend the life of red blood cells. The potential problem that exists is gallstones, although that danger already exists in many non-thals too.