Rosemary, an aromatic herb native to the Mediterranean region, has been a staple in global cuisines for centuries. But beyond its distinctive fragrance and bold flavors, rosemary is now gaining recognition for its impressive health benefits—especially in relation to brain health, inflammation reduction, and immune system support.
Recent studies indicate that rosemary may also play a significant role in preventing Alzheimer’s disease—the leading cause of dementia worldwide.
As far back as ancient times in Greece and Rome, rosemary was incorporated into study rituals due to the belief that it enhances concentration and memory. Today, modern research confirms that there may be scientific grounds for this belief: in one study, people who inhaled the scent of rosemary performed better on memory tests compared to those in an unscented environment.
How Does It Work?
It improves blood flow, including to the brain, which may enhance mental clarity. In addition, it has calming properties, and its aroma has been found to reduce anxiety and improve sleep quality—factors that indirectly contribute to better focus and improved memory.
Rosemary contains compounds that act on neural receptors in the brain. One of these, 1,8-cineole, helps inhibit the breakdown of acetylcholine—a key chemical involved in learning and memory. This could help preserve cognitive function, particularly with age.
Rosemary is also rich in antioxidants, which help protect brain cells from oxidative damage—a key factor in cognitive decline. Another potent compound found in the plant is carnosic acid, a powerful antioxidant and anti-inflammatory. Studies have found that it protects brain cells from damage associated with Alzheimer’s disease.
In 2025, scientists developed a stable version of this acid, called diAcCA. In preclinical trials, the compound showed improvements in memory, increased synaptic connections between brain cells, and a reduction in harmful proteins such as amyloid-beta and tau—both associated with Alzheimer’s disease.
The diAcCA compound is only active in inflamed areas of the brain, which may reduce side effects. Trials in mice showed no signs of toxicity and even demonstrated significant improvement in cognitive function—raising hopes for future human trials.
Researchers believe this compound could also have therapeutic potential for other inflammatory diseases, such as type 2 diabetes, heart disease, and Parkinson’s.
Rosemary’s benefits are not limited to the brain: it has traditionally been used to relieve digestive issues, bloating, and various inflammations. Compounds such as rosmarinic acid and ursolic acid are known for their anti-inflammatory properties. There is also evidence that rosemary benefits the skin—it may help soothe acne and eczema, and carnosic acid may protect the skin from sun damage and help slow skin aging.
Rosemary oil has also been shown to have antimicrobial properties, which could make it useful for food preservation and even future medical applications. Rosemary oil is gaining popularity in the context of hair growth, but it’s recommended to consult a dermatologist before regular use.
Warnings and Considerations
In most cases, rosemary is safe for use as a spice, infusion, or in aromatherapy. However, in concentrated doses or extract form, it may cause side effects. Excessive consumption can lead to vomiting, and in rare cases—seizures, especially in individuals with epilepsy.
There is also a theoretical risk that it could cause uterine contractions, so it is advised to avoid high intake during pregnancy. Additionally, since it may affect the action of blood thinners, it is important to consult a doctor before taking supplements.