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Osha; Ligusticum porteri

Principal Proposed Uses: Cough; Indigestion; Respiratory Infections

The osha plant is a traditional Native American remedy for respiratory infections and digestive problems. A related plant, Ligusticum wallichii, has a long history of use in Chinese medicine, and most of the scientific studies on osha were actually performed on this species.

Osha is frequently recommended for use at the first sign of a respiratory infection. Like a sauna, it will typically induce sweating, and according to folk wisdom this may help avert the development of a full-blown cold. Osha is also taken during respiratory infections as a cough suppressant and expectorant, hence the common name "Colorado cough root."

Chinese research suggests that Ligusticum wallichii can relax smooth muscle tissue (perhaps thereby moderating the cough reflex) and inhibit the growth of various bacteria.  Whether these findings apply to osha as well is unknown.

Dosage
Osha products vary in their concentration and should be taken according to directions on the label.

Safety Issues
Osha is believed to be safe, although the scientific record is far from complete. Traditionally, it is not recommended for use in pregnancy. Safety in young children, nursing women, or those with severe liver or kidney disease has also not been established.

One potential risk with osha is contamination with hemlock parsley, a deadly plant with a similar appearance.

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