linalool

Linalool is the molecule doing most of the work in two very different corners of this library. In lavender, Lavandula angustifolia, it runs 33.6 to 46.1 percent of the flower oil, one of the plant's two quality markers; in coriander seed, Coriandrum sativum, it is specified at 65 to 78 percent of the oil, closer to 71.7 in practice. Bay leaf, cardamom and jasmine carry smaller or unquantified shares of the same molecule. Five botanicals list it in total, and between them they do two different jobs: floral calm from the flowers, a citrus lift from the seed.

Linalool, C₁₀H₁₈O, is a monoterpene alcohol, and drying shifts an oil toward it rather than away from it. A 2022 study that dried oregano six different ways found the lighter terpene hydrocarbons carrying the green top notes fell on drying while linalool, carvacrol and isoborneol rose as a share of what was left; the rack does not shrink an oil evenly, it strips the top off first. In coriander seed, which runs roughly seventy percent linalool by one regulatory measure, that share is large enough to carry the whole spice: ground into a curry powder or a seven-spice mix, it is the gentle citrus lift that keeps the largest ingredient in the jar from reading as dust.

Lavender's calming reputation has one serious trial behind it, and it is not for the isolated molecule. A meta-analysis of five placebo-controlled trials of Silexan, a standardized lavender oil capsule sold as a licensed medicine in Germany, found it beat placebo by 2.9 points on the Hamilton Anxiety scale across 1,213 patients, a modest but real effect. One of the five trials was flatly negative, and every one of them, meta-analysis included, was run and funded by the company that sells the capsule. The evidence is for lavender's whole oil, not for linalool taken alone. In this library it shows up in eleven recipes, mostly the floral, sleep-leaning teas, always traced to lavender, jasmine or coriander.