MMW Munch Med Wochenschr. 1976 Mar; 118(11): 317-20.

[The sedative effect of the Kneipp hay sack and balneological preparations of hay (author's transl)]

FrÃƒÂ¶hlich HH, Müller-Limmroth W.

A chromatographic analysis of the hay charge used for balneological and thermotherapy which contains coumarin, the hydroxycoumarins umbelliferone and esculin and also the furanocoumarin imperatorin. The sedative effect of the hay can be explained by the coumarin and the imperatorin; the absorption site is to be found in the respiratory tract.