Red root (Ceanothus americanus), also known as New Jersey tea, has a history of traditional use in North American herbalism, particularly among Native American tribes and later in Western herbal medicine. It has been used to support the lymphatic system, especially for conditions involving lymphatic congestion such as swollen glands, tonsillitis, and sore throats. Traditional herbalists prepared decoctions or tinctures of the root, believing it helped "move" lymph, reduce lymphatic congestion, and promote detoxification through the lymphatic channels.

The historical literature and herbal texts cite red root as a lymphagogue—an agent that promotes lymphatic flow. However, scientific studies supporting these claims are sparse. There are some pharmacological investigations into the plant’s constituents, such as tannins and alkaloids, but no robust clinical trials or modern scientific evidence directly confirming its effectiveness for lymphatic disorders. Thus, the use of red root for the lymphatic system remains rooted in traditional practice rather than validated by current biomedical research.

In summary, red root is primarily used to support the lymphatics based on traditional knowledge, with limited scientific validation to date.