Osha (Ligusticum porteri) is primarily used in traditional Native American and herbal medicine, especially for respiratory ailments such as coughs, colds, and sore throats. Its use for external bleeding is rooted in traditional practices, where various plant poultices and infusions were sometimes applied to wounds to aid in healing or to help stop bleeding. However, specific documentation of osha being used externally for bleeding is limited, and most references to osha’s use focus on its internal application for respiratory conditions.

There is very little scientific evidence to support the use of osha for treating external bleeding. The few references available in ethnobotanical literature suggest that some Native American groups may have used the root as a topical application, but these are general references to wound healing rather than to hemostatic (bleeding-stopping) properties specifically. There are no clinical studies or pharmacological analyses demonstrating that osha has compounds with significant hemostatic effects.

In summary, osha’s use for external bleeding is based largely on traditional knowledge and anecdotal reports, not on scientific validation or clinical research. The evidence supporting this use is weak, and it is not commonly recognized in modern herbal references as a primary plant for external bleeding.