Aromatherapy studies involving rosemary scent show modest improvements in prospective memory — tasks like remembering appointments or planned actions. Improvements typically ranged from 5% to 15%.
One small study in older adults reported about a 15% improvement in certain memory tests after participants consumed a concentrated rosemary drink.
Animal studies suggest rosemary compounds may help support neurotransmitters such as acetylcholine, which plays a critical role in learning and memory.
Human trials indicate rosemary aroma can slightly increase alertness and recall speed, but the effects are subtle, short-term, and highly dependent on context.
Most of these studies involved small sample sizes, short durations, or tightly controlled conditions, which limits how much we can apply the results to everyday life.
Where Did the “75%” Claim Come From?
The dramatic number appears to trace back to a decimal-point error.
At a scientific conference, a researcher reported an improvement of approximately 7.5% in memory-related performance. Somewhere along the way, that decimal point vanished — and a modest result became a viral headline.
The researcher later clarified the mistake, but by then, the exaggerated figure had already spread widely online.
Why Rosemary Is Still Worth Attention
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