Angelica (Angelica archangelica and related species) has a long history of use in traditional herbal medicine, particularly in Europe and Asia, for supporting circulation and treating symptoms associated with poor blood flow. In Traditional Chinese Medicine (TCM), Angelica sinensis (Dong Quai) is well-known for its use in formulas intended to "invigorate the blood," address blood stasis, and improve peripheral circulation, especially in relation to menstrual health and conditions thought to involve sluggish or stagnant blood. Similarly, in European folk medicine, Angelica has been used as a warming herb believed to stimulate circulation and address cold extremities and related symptoms.

However, scientific evidence supporting these traditional uses remains limited. While Angelica contains compounds such as coumarins, essential oils, and flavonoids, which may have vasodilatory or antiplatelet effects in vitro or in animal studies, robust clinical trials in humans specifically evaluating its efficacy for poor circulation are lacking. Most of the available evidence is historical, anecdotal, or derived from broader uses of Angelica in multi-herb preparations, rather than from controlled studies focused on circulation.

In summary, Angelica's use for poor circulation is primarily justified by longstanding traditional practices in both Eastern and Western herbalism, with only sparse and indirect scientific support. Thus, the evidence rating is low, reflecting the absence of high-quality clinical data.