Spearmint is one of the more versatile herbs you can keep in your kitchen or medicine cabinet. Most people know it as a flavor in gum or mojitos, but it has a surprisingly well-studied range of uses, from calming digestive discomfort to lowering certain hormones linked to acne and excess hair growth. Here’s what spearmint is actually good for and how to get the most out of it.
Hormonal Balance and Excess Hair Growth
This is probably the most talked-about use for spearmint, especially among women with polycystic ovary syndrome (PCOS). Spearmint has anti-androgen properties, meaning it can lower levels of hormones like testosterone that drive symptoms such as acne, oily skin, and unwanted facial or body hair (hirsutism).
In a randomized controlled trial of 150 participants, drinking spearmint tea twice daily for 12 weeks reduced testosterone levels by 15% in the PCOS group and 12% in the group without PCOS. That’s a meaningful shift for something as simple as tea. The hormonal changes show up relatively quickly in bloodwork, but visible changes to hair growth take longer. Studies lasting only 30 days found that testosterone dropped but hair density scores on standardized scales didn’t budge yet. Researchers noted that a longer treatment period would likely be needed to see physical results. If you’re using spearmint for this purpose, think months rather than weeks.
Digestive Comfort
Spearmint has been used for centuries to settle the stomach, and there’s a clear biochemical reason why. Its primary active compound relaxes the smooth muscle lining of the intestines by blocking calcium channels in those muscle cells. This is the same basic mechanism used by some prescription antispasmodic drugs. In lab testing, this compound was nearly 100 times more potent than a well-known pharmaceutical calcium channel blocker at reducing gut contractions.
In practical terms, this means spearmint can help with cramping, bloating, and the general discomfort of indigestion. It works by calming the involuntary muscle contractions that cause that tight, spasming feeling in your gut. A cup of spearmint tea after a heavy meal is a classic remedy for good reason. One important distinction from peppermint: spearmint contains very little menthol. Its primary compound is carvone, which gives it that characteristic sweet, mild flavor. This makes spearmint gentler on the stomach than peppermint for many people.
Working Memory and Mental Sharpness
A less well-known use for spearmint is cognitive support, particularly for people noticing age-related changes in memory. A clinical trial tested a concentrated spearmint extract in men and women with age-associated memory impairment. After taking 900 mg per day of the extract, participants showed a 15% improvement in the quality of their working memory and a 9% improvement in spatial working memory accuracy compared to placebo.
Working memory is what you use to hold information in your mind while you’re actively using it: following a conversation, doing mental math, remembering where you put your keys five minutes ago. These aren’t dramatic numbers, but for a plant-based supplement with minimal side effects, they’re notable. The extract used in the study was a standardized, concentrated form, not regular tea. If cognitive support is your goal, look for spearmint extract supplements rather than relying on brewed tea alone.
Antioxidant Powerhouse
Spearmint leaves are exceptionally rich in rosmarinic acid, a potent antioxidant compound. A comparative study of plants in the mint family found that spearmint contained the highest concentration of rosmarinic acid of any species tested, with levels reaching up to 58.5 mg per gram of dried plant material. For context, rosemary (the plant rosmarinic acid was originally named after) contained only about 10.3 mg per gram in the same comparison. Spearmint outperformed rosemary, sage, thyme, and lavender.
Rosmarinic acid helps neutralize free radicals, the unstable molecules that contribute to inflammation and cellular damage over time. This antioxidant density is part of why spearmint shows up in so many traditional medicine systems. You don’t need to think about the chemistry to benefit from it. Regularly drinking spearmint tea or cooking with fresh spearmint leaves delivers these compounds naturally.
Natural Antimicrobial Uses
Spearmint essential oil has demonstrated broad antibacterial activity in laboratory settings. One study tested the oil against 30 strains of bacteria across 16 species and found it inhibited growth across the board, with very low concentrations needed to stop bacterial growth. This makes spearmint oil a reasonable choice for natural cleaning solutions, DIY mouthwashes, or topical applications where mild antibacterial action is useful. It’s worth noting that lab results don’t always translate directly to real-world effectiveness, and spearmint oil shouldn’t replace medical treatment for infections.
How to Brew Spearmint Tea for Maximum Benefit
If you’re using spearmint primarily as tea, preparation matters. Heat your water to about 200°F (93°C), which is just below a full boil. Pour it over the leaves and steep for 5 to 10 minutes. Shorter steeping gives a lighter, more delicate flavor. Longer steeping pulls out more of the active compounds and produces a stronger, more robust cup. Avoid using fully boiling water, which can scald the leaves and create bitterness.
For hormonal effects, the research used two cups per day as the standard dose. For general digestive comfort or as an enjoyable daily tea, one to two cups is typical.
Who Should Be Cautious
Spearmint is safe for most people at normal tea-drinking amounts, but there are a few groups who should pay attention. Cleveland Clinic recommends limiting or avoiding spearmint tea if you have GERD (acid reflux), kidney issues, or liver problems. Spearmint can worsen these conditions at higher doses or with frequent consumption. If any of these apply to you, occasional small amounts may still be fine, but it’s worth checking with your doctor about your specific situation. The key variable is dose: a cup here and there is very different from drinking multiple cups every day for months.