Ancient people appreciated Salvia rosmarinus, or rosemary, for its medicinal and dietary benefits. Essential bioactive compounds, such as rosmarinic and carnosic acids, endow rosemary with anti-inflammatory, antioxidant, antimicrobial, and neuroprotective properties, contributing to its health benefits. In terms of nutrition, rosemary is an excellent source of key vitamins, minerals, and dietary fiber, which help promote overall well-being. Rosemary serves not only in culinary and medicinal applications, but also in cosmetic and aromatherapy fields, underscoring its multifaceted functions and historical significance. Furthermore, the conditions under which rosemary is cultivated and harvested also influence the preservation of its compounds. This chapter examines the health of rosemary as part of the integration of traditional knowledge and modern scientific research by highlighting the health-protective value of rosemary and gives practical recommendations for its safe and effective use in diverse fields.