Citral

What is Citral?

Slice a lemon and that bright, razor-sharp citrus hit you get? That is largely citral at work. Chemically, citral is not a single compound but a natural mixture of two geometric isomers: geranial (the trans form, also called citral A) and neral (the cis form, citral B). Both carry the same formula (C10H16O) and the same carbonyl-tipped ten-carbon skeleton, and together they account for the clean, intensely lemony character of lemongrass, lemon myrtle, Litsea cubeba, and candied-citrus flavors worldwide.

The isomers usually coexist in roughly 60:40 (geranial:neral) proportions, and the two are chemically interconverted by mild acids or enzymes in the plant. Because of that relationship, a COA report may list them individually as geranial and neral or lump them together as citral, depending on the lab's integration method.

Aroma and flavor

Citral carries a scent profile described as lemon, citrus, fresh. Terpenes like this one shape both how a cannabis flower smells and much of its perceived character.

Commonly associated effects

In cannabis products, Citral is commonly associated with the following qualities. These reflect general research and community reports, not guaranteed or medical outcomes.

From lemongrass to flavour chemistry

Lemongrass oil can contain 65 to 85 percent citral by weight, which makes it one of the richest natural sources, alongside Litsea cubeba (may chang) oil. Whatever its origin, the molecule is a feedstock: industrial chemistry converts it into ionones (the violet-smelling aroma compounds in perfumery), into vitamin A, and into menthol through a sequence of condensation and reduction steps. Lemon myrtle and lemon verbena are other high-citral natural sources. In cannabis, citral is a minor but distinctly citrus-forward terpene; strains already rich in limonene may carry small amounts of citral as an amplifier of that lemon character.

Why citral smells so intensely lemony

Human olfaction is unusually sensitive to citral: the detection threshold is roughly 40 parts per billion in air, which means a tiny amount produces a pronounced effect. The aldehyde functional group (CHO at the end of the carbon chain) binds strongly to olfactory receptor OR1A1, the same receptor that responds to geraniol and linalool, but the carbonyl makes the interaction faster and more intense than the corresponding alcohol. That is why lemon flavors in food and drink use citral-rich oils rather than squeezing actual lemons: you get maximum lemon impact with much smaller quantities.

Frequently asked questions