Spearmint and peppermint are both mints, and buyers sometimes treat them as interchangeable variations on a theme. They are not. The distinction rests on which molecule dominates, and it produces two materials with genuinely different jobs.

Carvone against menthol

Spearmint oil (CAS 8008-79-5) is led by carvone, which delivers a sweet, soft, herbal mint character with almost no cooling sensation. Peppermint oil is led by menthol, which brings the cooling bite. That single difference explains most of the formulation consequences that follow.

What that means in product

Chewing gum: spearmint is the classic sweet-mint profile; peppermint is the sharp one. The choice is a brand positioning decision as much as a technical one.
Toothpaste: peppermint dominates, because the cooling sensation reads to consumers as cleanliness and efficacy.
Children’s products: spearmint is often preferred because the absence of cooling makes it milder.
Beverages and confectionery: spearmint sits more comfortably alongside fruit notes, where peppermint tends to dominate them.

Buying spearmint against a number

Spearmint is commonly traded on carvone content, typically in the 60 to 80 percent range. For formulators who need a fixed input rather than a natural oil that varies by crop and season, isolated L-carvone (CAS 6485-40-1) removes that variability entirely. Which you want depends on whether a natural oil claim matters more than batch-to-batch reproducibility.

The cost conversation

Spearmint is generally the more expensive of the two per kilo, and it does not carry menthol, so it cannot be used to deliver cooling on the cheap. If a brief calls for both a sweet mint character and a cooling effect, the answer is usually spearmint plus a non-menthol cooling agent rather than a compromise blend of the two oils, which tends to satisfy neither requirement.

Sourcing both from one place

Because the two are frequently used together or traded off against each other, buying across a supplier’s full mint range makes reformulation considerably easier — the specification format, documentation and contact stay constant while the material changes.