Surprising
A double-blind trial found that hibiscus improved delayed word recall — but only on one memory test, while other cognitive measures showed no effect.
This is a small pilot study, so the finding is intriguing but far from conclusive — especially since most cognitive tests in the trial came up empty.
Overweight adults who drank a hibiscus beverage did better on a test of remembering words after a delay, compared to placebo. However, hibiscus had no effect on other measures of memory, thinking speed, or blood pressure, and the study only tracked effects over two hours after a meal.
Where this fits in the evidence
This is among the first studies we've indexed on Hibiscus for Improved Delayed Word Recall — treat it as an early signal until more research accumulates.
The study
Acute effects of Hibiscus sabdariffa on blood pressure and cognitive function.
- Randomized Controlled Trial (RCT)
- 2025-02-26
- Nutritional neuroscience
This is a plain-language summary of a research finding, not medical advice. Pillser surfaces research signals to help you decide what's worth investigating — always consult a qualified professional before changing what you take.