Spearmint and peppermint are closely related plants with noticeably different flavors, chemical profiles, and uses. Peppermint delivers an intense cooling sensation thanks to its high menthol content (around 35%), while spearmint has a sweeter, milder taste driven by a completely different compound called carvone (around 60%). That single chemical distinction shapes everything from how they taste in food to how they work in your body.
How the Two Plants Are Related
Spearmint is one of the original species in the mint family. Peppermint is actually a hybrid, a natural cross between spearmint and watermint. Because of this parentage, peppermint is sterile and can’t produce seeds. It spreads only through runners and cuttings, which is why every peppermint plant is essentially a clone.
Both plants have square stems and grow aggressively once established. Spearmint leaves are elongated with pointed, serrated edges that curve toward the leaf tip. Its flower spikes are dense whorls that bloom from midsummer into fall. Peppermint leaves tend to be slightly darker and smoother, often with a purplish tint on the stems, and the overall plant has a more compact shape.
The Flavor Difference
The cooling, almost icy punch of peppermint comes from menthol, which activates cold-sensing receptors on your tongue and skin. Peppermint essential oil contains roughly 35% menthol, which is why it feels so sharp. Spearmint contains almost no menthol at all. Its dominant compound, carvone, produces a gentler, sweeter mintiness without that aggressive cooling bite.
If you’ve ever chewed a stick of Doublemint gum, you’ve tasted spearmint. If you’ve sucked on a candy cane or an Altoid, that’s peppermint. The difference is immediately obvious once you taste them side by side.
How They’re Used in Cooking
Spearmint is the everyday cooking mint. Its sweeter, more delicate flavor makes it a staple in Middle Eastern and Mediterranean dishes like tabbouleh, lamb, yogurt sauces, and fresh salads. It’s also the mint in a classic mojito or a glass of sweet iced tea. Because spearmint doesn’t overpower other ingredients, it blends easily into savory recipes.
Peppermint works best in sweets and beverages where you want that bold cooling effect to stand out. Think peppermint bark, chocolate mint ice cream, candy canes, and hot peppermint tea. Its intensity pairs well with rich flavors like dark chocolate and cream, but it can easily overwhelm a savory dish if you swap it in for spearmint.
Digestive Benefits of Peppermint
Peppermint has the stronger reputation for digestive relief, and the reason traces back to menthol. Menthol blocks calcium channels in the smooth muscle lining your intestines, which prevents those muscles from contracting and spasming. This relaxation effect is why peppermint oil capsules are commonly used to ease symptoms of irritable bowel syndrome, including cramping, bloating, and abdominal pain.
That same muscle-relaxing ability has a downside, though. Peppermint can relax the valve between your stomach and esophagus, which allows stomach acid to travel upward. If you deal with acid reflux or heartburn, peppermint tea or supplements can make symptoms worse rather than better.
Spearmint and Hormonal Effects
Spearmint has drawn attention for a different health benefit: its potential anti-androgen properties. Research on women with excess hair growth (hirsutism) and polycystic ovary syndrome (PCOS) suggests that drinking spearmint tea may help reduce free testosterone levels in the blood. The mechanism appears to involve speeding up how the body metabolizes androgens, or possibly interfering with androgen production directly.
A 2007 study published in Phytotherapy Research found that spearmint tea lowered free testosterone in women with hirsutism. Broader meta-analyses of herbal teas in PCOS populations have found that spearmint may help increase follicle-stimulating hormone (FSH) and improve hormonal symptoms like acne and irregular periods, though the evidence on total testosterone and other androgen markers is less consistent. Spearmint tea is not a replacement for medical treatment, but it’s one of the few herbal options with clinical data behind it for this specific use.
Which One Is Safer for Kids?
Because peppermint’s menthol content is so much higher, it’s more likely to cause irritation, especially on sensitive skin or mucous membranes. Spearmint is sometimes recommended as a gentler substitute for children when using mint-flavored products or diluted essential oils. The lower menthol concentration makes it less likely to cause a burning sensation or respiratory irritation in young kids.
Choosing Between Them
The choice between spearmint and peppermint comes down to what you need. For cooking savory food, making cocktails, or adding fresh herbs to a dish, spearmint is almost always the better pick. For desserts, holiday baking, or a strong cup of mint tea, peppermint gives you that unmistakable cooling punch.
For digestive comfort, peppermint is the more effective option, as long as acid reflux isn’t a concern. For hormonal balance or a milder everyday tea, spearmint has its own distinct advantages. They’re siblings, not twins, and swapping one for the other in a recipe or remedy will give you a noticeably different result.