Spearmint and peppermint tea are not the same. They come from two different plants, contain different active compounds, taste noticeably different, and offer distinct health benefits. While both belong to the mint family, choosing between them actually matters depending on what you’re hoping to get from your cup.
Two Different Plants
Spearmint (Mentha spicata) is one of five basic species in the mint genus. Peppermint (Mentha × piperita) is actually a hybrid, a natural cross between spearmint and water mint. That “×” in the scientific name signals its hybrid origin. Because peppermint inherited traits from two parent species, its chemical profile is more intense than spearmint’s, which explains why it hits your palate harder.
You can tell them apart visually, too. Spearmint has pointed, slightly wrinkled leaves with a bright green color. Peppermint leaves are darker, smoother, and slightly more elongated, often with a purple or reddish tinge along the stems.
Why They Taste So Different
The flavor gap between these two teas comes down to their dominant chemical compounds. Peppermint’s essential oil is roughly 38% menthol, the compound responsible for that sharp, icy cooling sensation in your mouth and throat. It also contains about 22% menthone, which adds a slightly sweet, minty undertone.
Spearmint, on the other hand, contains very little menthol. Its signature compound is carvone, which makes up about 70% of its essential oil. Carvone delivers a sweeter, gentler, more herbaceous flavor without the intense cooling bite. If peppermint feels like a blast of cold air, spearmint feels like a warm, slightly sweet breeze. This is why spearmint is the preferred mint for savory cooking (lamb, salads, fish), while peppermint dominates in candy, gum, and desserts.
Peppermint Tea for Digestion
Peppermint tea has a well-documented effect on the digestive tract. The menthol in peppermint relaxes the smooth muscle lining your gut by reducing calcium flow into muscle cells, essentially telling those muscles to stop contracting. This is why peppermint tea is commonly used for bloating, gas, stomach cramps, and symptoms of irritable bowel syndrome (IBS). For people dealing with frequent digestive discomfort, peppermint is the stronger choice of the two.
There’s a catch, though. That same muscle-relaxing ability can work against you if you have acid reflux. Peppermint relaxes the ring of muscle between your esophagus and stomach, which can allow stomach acid to flow upward. Donald Castell, a gastroenterologist and professor emeritus at the Medical University of South Carolina, has noted that peppermint relaxes the smooth muscle in the lower esophagus. If heartburn or GERD is something you deal with, spearmint tea is the safer option since it doesn’t have this strong muscle-relaxing effect.
Spearmint Tea for Hormonal Balance
Spearmint has a benefit that peppermint doesn’t share: it can lower androgen levels. In a randomized controlled trial, women with polycystic ovary syndrome (PCOS) drank spearmint tea twice daily for 30 days. By the end of the study, both free and total testosterone levels had dropped significantly compared to the placebo group. Hormones that stimulate the ovaries (LH and FSH) also increased.
The researchers noted that while testosterone levels clearly fell, the study wasn’t long enough to see visible changes in excess hair growth, since hair follicles have a slow turnover cycle. Still, the hormonal shift was real and measurable, making spearmint tea a popular natural option among women managing PCOS symptoms like hormonal acne and hirsutism. Peppermint tea has not been studied for this effect.
Caffeine and Everyday Drinking
Both spearmint and peppermint teas are naturally caffeine-free when brewed on their own, making either a good option before bed or for anyone avoiding stimulants. The caveat is pre-packaged tea blends. Many commercial “mint teas” mix peppermint or spearmint with green tea leaves, which do contain caffeine. Moroccan mint tea, for example, is traditionally brewed with both mint and green tea. If you want to stay caffeine-free, check the ingredients list and look for teas labeled as herbal rather than blended.
Which One to Choose
Your choice depends on what you want the tea to do.
- For digestive relief: Peppermint tea is more effective thanks to its high menthol content, which directly relaxes gut muscles and eases cramping.
- For hormonal support: Spearmint tea is the one with evidence for lowering androgen levels, particularly relevant for women with PCOS.
- For acid reflux: Spearmint is the better pick, since peppermint can relax the valve that keeps stomach acid in place.
- For a milder, everyday flavor: Spearmint’s sweeter, gentler taste makes it easier to drink multiple cups without the intense cooling sensation.
- For a strong, refreshing kick: Peppermint delivers that sharp, icy hit that feels invigorating, especially when brewed strong.
They’re both mint, both caffeine-free, and both pleasant to drink. But they’re genuinely different teas with different strengths, and picking the right one can make a real difference depending on what your body needs.