Manufactured by extraction of menthol from menthol oil. The oil is chilled to a temperature of -40°C to separate the menthol, which is later crystallized by slow cooling. These crystals are available in the following two grades and confirm to IP/BP/USP/JP/FCC-III standards. Menthol Large Crystals Menthol Small Crystals Terpeneless crystals are made by the fractional distillation of menthol