What Is Menthol Crystal? Production, Uses and How to Buy

In short: Menthol crystal is solid menthol – clear or white crystals with a strong cooling smell – obtained by chilling Japanese (Asian) mint oil, Mentha arvensis, and separating the crystals. It is used in balms, ointments, toothpaste, confectionery and cosmetics. When buying, check purity, melting point and the lot’s certificate of analysis.

How is menthol crystal made?

1. Steam-distil Asian mint to obtain menthol-rich crude oil.
2. Chill the oil so menthol crystallises out.
3. Separate and dry the crystals (filtering, centrifuging); recrystallise for higher purity.
4. The remaining liquid is dementholised mint oil, still used in flavours and fragrances.

That is why high-menthol varieties such as Japanese mint are the main source of natural menthol. Synthetic menthol is also produced chemically.

What is it used for?

• Balms, ointments, roll-ons – cooling sensation on the skin.
• Toothpaste, mouthwash, candy, chewing gum.
• Shampoos, shower gels, deodorant sprays.

How to choose menthol crystal

Criterion	What to check
Appearance	Dry, free-flowing clear or white crystals; not oily or caked
Purity	Good natural menthol is typically around 99% or higher
Melting point	L-menthol melts at about 42–45 °C
Lot documents	Certificate of analysis and origin – see how to read a COA

Storage and safety

Menthol sublimes at room temperature, so keep it in a sealed jar in a cool, dark place. Concentrated menthol can irritate skin and eyes; keep it away from children’s faces and out of their reach.

FAQ

How is menthol crystal different from mint oil?

Mint oil is a liquid mixture of many compounds; menthol crystal is almost a single pure compound in solid form, with a sharper cooling effect.

Can I order small quantities?

Yes. Thao Duoc Xanh supplies both small workshops and larger manufacturers, priced by volume.

Further reading

• How to read GC-MS reports and COAs
• Quality control of mint oil and raw materials
• Asian mint, peppermint and hung lui