Gentian (Gentiana lutes). Gentian strengthens the entire human system, because it stimulates the appetite, it is useful in treating anorexia and exhaustion. Gentian is beneficial to the digestive process due to its ability to improve the blood vascular system, insuring that the abdominal organs receive a rich supply of blood. It stimulates the pancreas and thus makes it an excellent herb for the diabetic or pre-diabetic. It also has a normalizing effect on the thyroid gland.