Widely used in folk remedies, marjoram has been used like hyssop to treat the symptoms of colds, flu and coughs, and as a mouthwash. It needs to be avoided by pregnant women. As an aromatic it helps digestion, hence its use in cooking.
“…marjoram joy of the mountains flowers again
even in the light frosts of these nights …” (W.S.Merwin, Autumn Evening)