Essential oils of rosemary and thyme were analyzed. The current study was conducted to evaluate the protective effect of thyme ( Thymus vulgaris L.) and rosemary ( Rosmarinus officinalis L.) against osteoporosis in rats with low calcium intake. There is a direct link between calcium deficiency in diet and induction of osteoporosis and bone loss. Osteoporosis poses an important public health problem which affects millions of people worldwide.