Essential Oils Club

The Journal 2 min read

Peppermint vs Spearmint: What's the Difference?

They're both mints, but peppermint and spearmint are chemically different oils with different strengths and safety notes. Here's how to tell them apart and when to use each.

Peppermint and spearmint smell like cousins because they are, but the difference between them comes down to one molecule, and it changes everything about how they feel, what they’re used for, and how safe they are around children.

The one molecule that separates them

  • Peppermint is menthol-rich. Menthol activates the cold-sensing TRPM8 receptor (that intense cooling hit) and is the reason peppermint feels sharp and icy. Its composition is menthol- and menthone-dominant (study), and menthol’s receptor action is well characterised.
  • Spearmint is carvone-rich and low in menthol, so it’s sweeter and much gentler, minty without the cold bite (composition).

What each is good for

Peppermint, the powerhouse:

  • Cooling, alerting aroma for focus and energy.
  • The best-evidenced mint for digestion, see our peppermint and IBS deep dive (enteric-coated capsules, under guidance).
  • Tired muscles, well diluted.

Spearmint, the gentle one:

  • A sweeter, softer mint aroma many people prefer.
  • The go-to when peppermint feels too strong.
  • Often chosen for use around children because it’s low in menthol.

The safety difference that matters

Menthol is the catch. Menthol-rich oils like peppermint should be kept away from the faces and chests of infants and young children, where they can cause breathing problems (see our note on cineole and menthol oils around children). Spearmint, being low in menthol, is generally considered the gentler choice, though you should still dilute it and diffuse in a ventilated room.

Which should you buy?

  • Want a strong, cooling, do-everything mint? Peppermint.
  • Want a sweeter, gentler mint, or one for a household with young kids? Spearmint.
  • Many people keep both, peppermint for punch, spearmint for softness.

Bottom line

Peppermint is menthol; spearmint is carvone. That single difference makes peppermint the stronger, better-evidenced (and more child-cautious) oil, and spearmint the sweeter, gentler everyday mint. Pick by how much cooling power, and how much caution, you need.

References

This article is educational and not medical advice.