Spearmint Isn't Just for Gum: They Bred a Brainy Version and Put It on Trial

The Oasis Health Journal · Submitted July 12, 2026 · 8:18 AM ET

Spearmint has a settled resume. It flavors gum, it garnishes mojitos, it owns a large stretch of the toothpaste aisle. Nobody has ever asked their gum to help them concentrate. That would be a strange thing to ask a gum.

So it is mildly funny that a spearmint extract has spent the better part of a decade in cognition labs, wired up to computerized attention tests, quietly beating placebo. The catch is that this is not the spearmint on your windowsill. It is a line of Mentha spicata bred to be overloaded with polyphenols, then water-extracted and standardized. The branded version used in most of the research, Neumentix, comes in around 14.5% rosmarinic acid and roughly 24% total phenolics. The flavor is a passenger. The polyphenols are driving.

142 adults, 900 milligrams, and a long attention test

The headline trial recruited 142 healthy, recreationally active men and women between 18 and 50. Half took 900 mg of the spearmint extract every day, half took a placebo, and everyone ran the CNS Vital Signs cognitive battery for 90 days. Nobody, subjects or researchers, knew who got which, which is the entire point of double-blind.

The spearmint group improved on complex attention compared to placebo, and the effect turned up fast, inside the first week. Two specific tasks carried the result: one where the rules keep switching on you, and a continuous performance test, which is a formal way of saying 'stare at a screen and do not miss the target.' The gains held through the full 90 days. The same trial saw no change in mood, sleep, or quality of life for this younger group, which is a refreshingly honest thing for a supplement study to admit. An earlier readout of the data, presented at the Society for Neuroscience in 2017, framed it as sustained attention improving by day 30 and lasting to day 90. The full paper landed later in the journal Nutrition Research.

Older brains got their own trial

A separate study went after a different crowd: 90 men and women, average age around 59, all living with age-associated memory impairment, which is the normal, mild forgetfulness that arrives with the birthdays. They took 900 mg, 600 mg, or nothing for 90 days. At the 900 mg dose, quality of working memory improved about 15% and spatial working memory accuracy about 9% versus placebo. This group also reported falling asleep a little more easily, a perk the younger athletes did not get. Different brains, different wins, same mint. A third, smaller trial in athletes even tied the same extract to quicker reactive agility, the sports-science term for reacting to a moving target without tripping over your own feet.

Why a mint would do any of this

Rosmarinic acid gets most of the credit, backed by a supporting cast of salvianolic, lithospermic, and caftaric acids. Researchers propose a few overlapping mechanisms: mopping up oxidative stress, nudging acetylcholine (the neurotransmitter your brain leans on for focus and memory) upward, and helping neurons survive and grow. 'Propose' is the operative word. These are plausible, lab-and-animal-backed explanations, not facts carved into the side of a neuron.

One genuinely useful feature: it is not a stimulant. No caffeine, no jitter, no 3 p.m. crash where you negotiate with a vending machine. The tradeoff is that it works slowly and on continued use, so it rewards patience rather than one desperate dose before a meeting.

Now the part where it is not magic

Most of this research was funded by the company that sells the ingredient. That does not make it fake, but it does mean independent replication would be welcome, and there is not a mountain of it yet. The effect sizes are modest. 'Improved attention on a computerized battery' is a real, measurable thing and also not a superpower. And every result used a specific branded extract at a specific dose. Your gum, your mojito, and the plant on your porch are not running at 900 mg of standardized polyphenols, so do not expect them to file the same report. None of this treats ADHD, dementia, or any medical condition. It is a mint with an unusually good polyphenol profile and a few decent trials, which is a perfectly respectable thing to be.

If you go looking, the extract tends to travel in company. The shelf here stocks it inside nootropic focus blends that pair spearmint with lemon balm and saffron, and like everything here it is sourced fresh per order instead of aging on a shelf. That means it ships a little slower and lands a little more potent, which for a polyphenol that lives or dies by its freshness is the right trade.

This article is for education only and is not medical advice. Dietary supplements are not intended to diagnose, treat, cure, or prevent any disease. Talk with a qualified clinician before starting anything new, especially if you are pregnant, nursing, or taking medication.

Sources

1. Falcone PH, et al. The attention-enhancing effects of spearmint extract supplementation in healthy men and women: a randomized, double-blind, placebo-controlled, parallel trial. Nutrition Research, 2019.
2. Herrlinger KA, et al. Spearmint Extract Improves Working Memory in Men and Women with Age-Associated Memory Impairment. Journal of Alternative and Complementary Medicine, 2018.
3. Efficacy of a nootropic spearmint extract on reactive agility: a randomized, double-blind, placebo-controlled, parallel trial. PMC.
4. Nutritional Outlook: Spearmint Extract Neumentix Shows Sustained Cognitive Health Benefits.
5. NutraIngredients-USA: Spearmint extract may boost attention in healthy, active men and women.
6. NutraIngredients: Spearmint may boost sleeping ability, short-term memory among older adults.
7. Kemin: Neumentix Spearmint Extract for NeuroNutrition (ingredient composition).