Common thyme (Thymus vulgaris) is a traditional remedy for acute bronchitis, laryngitis, whooping cough, gastritis, diarrhea, and lack of appetite.
European practitioners use a variety of thyme products to treat spasmodic coughs, bronchitis, whooping cough, emphysema, and asthma.
Mucilaginous marsh mallow (Althaea officinalis) soothes irritated mucous membranes and loosens coughs.
The demulcent, expectorant, and astringent properties of mullein (Verbascum thapsus, V. phlomoides, V. densiflorum) make this herb useful in treating lung disorders.
Many German cough syrups rely on the antimicrobial, antispasmodic, and anti-inflammatory activity of fennel seeds (the fruits of Foeniculum vulgare) to relieve congestion of the upper respiratory tract.
The mucilaginous inner bark of slippery elm (Ulmus rubra) soothes irritated mucous membranes.
Lavender oil , according to a recent study, affects the exchange of calcium ions between cells, which ultimately relaxes smooth muscle tissue.
Only half the respondents of a recent British survey considered the oil of evening primrose (Oenothera biennis) beneficial.