Oak (Quercus robur)
Oak is rich in calcium and supports the action of Calcarea carbonica in Calciodoron-PM.
It is used in Lobelia compound for constriction of chest (see A Dictionary of Practical Materia Medica by John Clarke, MD, 3rd ed. 1987, vol.III, p. 943).
In Marjoram Compound, it is used for its astringent and blood coagulating effect (see Pharma Natura, S.A., 1996).