Herb Robert (Geranium robertianum) has a long history of use in European folk medicine, where it has been employed for a variety of purposes, including as a general tonic and for supporting the body's natural healing processes. In traditional herbalism, it is sometimes said to "cleanse the blood," a phrase often associated with support of the lymphatic system. However, these claims are largely anecdotal and based on historical usage rather than modern scientific research.

There is scant scientific literature directly evaluating Herb Robert’s effects on the lymphatic system. The plant contains tannins, flavonoids, and geraniin, which may have mild astringent and antioxidant properties. These constituents could theoretically support tissue health, but there are no published clinical trials or preclinical studies specifically demonstrating lymphatic system benefits or mechanisms in humans or animals. As a result, its use for lymphatic support is justified primarily by tradition, not by evidence from rigorous scientific studies.

In summary, while Herb Robert is sometimes recommended by herbalists for lymphatic support, this is based on traditional use rather than validated research, and the evidence is weak (rated 1 out of 5).