By Salma El-Sakka
Rosemary, an aromatic herb native to the Mediterranean, is gaining scientific recognition for its potential to enhance memory, reduce anxiety, and protect against Alzheimer’s disease.
Historical use and modern evidence
Historically, rosemary has been associated with memory and mental clarity. In ancient Greece and Rome, students and scholars used it to sharpen concentration. Modern research supports this: a study found that people who inhaled rosemary’s scent performed better on memory tasks than those in an unscented environment.
Mechanisms in the brain
Rosemary stimulates blood circulation, including to the brain, delivering more oxygen and nutrients that may improve mental clarity. Its aroma has calming properties that can reduce anxiety and improve sleep, indirectly supporting focus and memory retention. The herb contains 1,8-cineole, a compound that helps prevent the breakdown of acetylcholine, a brain chemical essential for learning and memory. Rich in antioxidants, rosemary also protects brain cells from oxidative stress, a major factor in cognitive decline.
Promising compound targets Alzheimer’s
One of rosemary’s most powerful phytochemicals is carnosic acid, an antioxidant and anti-inflammatory agent that shields brain cells from damage linked to Alzheimer’s. In 2025, researchers developed a stable version called diAcCA. Pre-clinical studies in mice showed that diAcCA improved memory, increased synapses, and reduced harmful Alzheimer’s-related proteins such as amyloid-beta and tau. The compound activates only in inflamed brain regions, potentially minimizing side effects. No toxicity was observed, raising hopes for human trials. Researchers also believe diAcCA could help treat other inflammatory conditions, including type 2 diabetes, cardiovascular disease, and Parkinson’s disease.
Broader health benefits
Beyond brain health, rosemary has been used traditionally to ease digestion, relieve bloating, and reduce inflammation. Compounds like rosmarinic acid and ursolic acid provide anti-inflammatory effects throughout the body. A review suggests rosemary can soothe acne and eczema, while carnosic acid may offer anti-ageing benefits by protecting skin from sun damage. Rosemary oil also demonstrates antimicrobial properties, showing promise for food preservation and pharmaceutical applications.
