Scientists Find Sniffing Rosemary Can Increase Memory By 75% – That’s why I’ve been sniffing it for years!
– Rosemary is a wonderful herb with a tradition of use spanning millennia. It has innumerable uses in both the kitchen and in herbal medicine.
Did you know that rosemary has been associated with memory enhancement since ancient times? It is true – and it has even been referred to from the latter part of the Elizabethan Era to the Early Romantic period as theherb of remembrance. In Shakespeare’s Hamlet, Ophelia says, “There’s rosemary, that’s for remembrance.” (Hamlet, iv. 5.) It has also long been used as a symbol for remembrance during weddings, war commemorations and funerals in Europe and Australia.  Mourners in old times would wear it as a buttonhole, burn it as incense or throw it into graves as a symbol of remembrance for the dead.
It seems that this tradition of Rosemary may actually far more ancient and have its origins in the Arabic world of medieval times, which was greatly advanced in science: In Henry Lyte’s 1578 “Niewe Herball“, an English version of Rembert Dodoens’ French treatise, it is written “The Arrabians and their successors Physitions, do say that Rosemarie comforteth the brayne, the memory and the inward senses, and that it restoreth speech, especially the conserve made of the flowers, thereof with Sugar, to be received daily.” 
Because of this seemingly esoteric association, rosemary has at times been made into a sort of herbal-amulet, where it was placed beneath pillowcases, or simply smelt as a bouquet, and it was believed that using rosemary in these ways could protect the sleeper from nightmares, as well as increase their memory.
What’s fascinating is that several scientific studies have now found remarkable results for rosemary’s effects on memory:
Rosemary essential oil’s role in aromatherapy as an agent that promotes mental clarity was validated by the study of Moss, Cook, Wesnes, and Duckett (2003) in which the inhalation of rosemary essential oil significantly enhanced the performance for overall quality of memory and secondary memory factors of study participants.
More recently, in 2012 a study on 28 older people (average 75 years old) found statistically significant dose-dependent improvements in cognitive performance with doses of dried rosemary leaf powder. 
Another study by Mark Moss and Lorraine Oliver at Northumbria University, Newcastle has identified 1,8-cineole (a compound in rosemary) as an agent potentially responsible for cognitive and mood performance.
Further studies by Mark Moss and team have found memory enhancements of up to an amazing 75% from diffusion of rosemary essential oil. 
Now if you are asking “How is it even possible that an aroma can enhance memory?” – well, that’s a great question. Here’s a fascinating quote from one of the scientific papers referenced: “Volatile compounds (e.g. terpenes) may enter the blood stream by way of the nasal or lung mucosa. Terpenes are small organic molecules which can easily cross the blood-brain barrier and therefore may have direct effects in the brain by acting on receptor sites or enzyme systems.” 
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