The present invention is concerned with nutritional or pharmaceutical compositions comprising extracts or concentrates of plants and the mixtures thereof belonging to Pinus. sp with specific reference to Pinus pinea. The extracts have been screened and characterized for their activity in the treatment of increased bone resorption and bone formation, osteoporosis in particular. The invention further relates to the use of the extracts as a supplement or a medicament useful in the treatment/alleviation or prevention of diseases or conditions characterized by increased bone resorption and a method of promoting bone growth, maintenance of bone health, comprising the administration of an therapeutically effective amount of the composition containing the extract.