Menthol: a saturated cyclic alcohol obtained from the oil of thin He (an extract of the fresh product of the large domestic species of the herb peppermint or house mint of the family Labiatae, which is divided into artificial and natural). Also known as menthol and peppermint ice. Just have have the special aroma of mint so called menthol. As shown

Mentha piperita is a perennial herb, 10 to 80cm high, the whole plant has a fragrance. The rhizome is creeping. The stem is erect, square, branched, and anatropous pilose. Leaves opposite, lanceolate, ovate or oblong, apex acute or acuminate, base cuneate, margin serrulate, both surfaces sparsely pubescent and glandular scales. Verticillasters axillary; bracts lanceolate or linear-lanceolate, ciliate; calyx campanulate, externally pilose and glandular scaly, 10-veined, 5-toothed; corolla cyanine-purple, reddish, or white, limb 4-lobed, upper lobe apically 2-lobed, larger, stamens 4. Nutlets ovate. Nutlets ovate. Flowering period August to October, fruiting period September to November. </img>