Most of the herbs in the product are effective antifungals, but killing Candida does not work. Candida is a natural part of the body, so you will never eliminate it.
As for the goldenseal, this is a berberine containing herb. Berberine kills the intestinal flora, and can damage the intestinal lining. Berberine also lowers blood sugar, which can be a problem for hypoglycemics and it depletes potassium, which can lead to a rise in blood pressure with continual use. Other berberine herbs in include Oregon grape root and barberry. These are the reasons I never recommend berberine containing herbs.
Being that goldenseal is close to being put on the endangered species list, which has caused the price to skyrocket, and it is the last ingredient on the list it is likely in the product in trace amounts anyway. In the industry the addition of herbs or compounds in trace amounts just so it can be listed on the label is called "fairy dusting".