Carnosic acid, a key phenolic diterpenoid compound found in rosemary (Rosmarinus officinalis), is widely used in the food industry as a natural antioxidant to prevent the oxidation of fats and oils, extending the shelf life of products. It is also incorporated into dietary supplements due to its potential health benefits, including anti-inflammatory, neuroprotective, and anti-cancer properties. In the cosmetic industry, it is utilized in skincare formulations for its ability to protect skin cells from oxidative stress, UV radiation, and environmental damage, while helping to reduce wrinkles. Additionally, carnosic acid is being researched for its antimicrobial properties, showing promise in applications for food preservation and as a natural alternative to synthetic preservatives. Its role in promoting plant health has also been explored, making it a component in agricultural products aimed at enhancing crop resilience.