Burdock Root
Arctium lappa

Burdock root is an interesting herbs as it has shown to be beneficial in treatment of:  Allergies, Herpes, Obesity Hypoglycemia, Kidney problems, Liver problems, Lymphatic congestion, , Skin disorders, Swelling, Infection, Colds, and Constipation.  Burdock roots ability to neutralize most poisons, relieving both the kidney and lymphatic system.  Burdock seeds and roots may be useful in treating a variety of skin conditions, including acne and dryness, especially when these problems are due to the Standard American Diet (lacking in nutrition diet), constipation, or liver burden. The liver plays an important role in removing impurities from the blood, producing bile to digest fats, metabolizing hormones, and accumulation of excess carbohydrates.

Safety / Caution
Pregnant women also should not use this burdock, as it is said to cause uterine contractions.

References
 Healthy Healing by Linda Page
The Little Herb Encyclopedia by Jack Ritchason
The New Age Herbalist by Richard Mabey