Citral: The Lemon Note That Must Be Declared

If you make anything with lemongrass, lemon myrtle, or May Chang oil in it, citral is probably the reason it smells the way it does, and it's also the reason you need to pay closer attention to your fragrance disclosure than you might with a rounder, less citrusy blend.

What citral is and where it comes from

Citral is the compound largely responsible for that sharp, true lemon scent you get from certain botanicals, distinct from the softer citrus notes in something like sweet orange oil. It's naturally abundant in lemongrass oil, lemon myrtle oil, and May Chang (litsea cubeba) oil, and shows up in smaller amounts in a number of other essential oils marketed as "lemony." If your ingredient deck includes any of these, assume citral is present and needs to be accounted for, rather than checking only for oils explicitly labeled "lemon."

It's a recognized fragrance allergen, meaning it belongs to the group of substances that Health Canada is bringing under mandatory disclosure requirements on both the Cosmetic Notification Form and the product label.

Why it degrades, and why that matters

Citral is chemically reactive in a way a lot of makers don't expect from an essential oil component. Exposed to air and light over time, it can oxidize and form other compounds, some of which are themselves sensitizing. This is part of why fragrance allergen science tends to focus not just on what's in the bottle at blending time, but on what a formula might contain after months on a shelf or in a customer's bathroom cabinet.

Practically, this means two things for a small-batch maker. First, storage matters: keeping citral-rich oils away from heat, light, and prolonged air exposure slows this degradation and keeps your formula closer to what you tested. Second, if you're formulating with citrus-heavy blends and expecting a long shelf life, it's worth treating oxidation as a real variable in your stability thinking, not just a fragrance-fade problem.

The Canada disclosure mechanics

Canada is rolling out mandatory fragrance allergen disclosure in two phases. List 1, which includes citral, becomes mandatory on both the CNF and the product label on April 12, 2026. A second, expanded set, List 2, follows on August 1, 2026, aligning Canada's requirements more closely with international allergen lists.

The trigger for disclosure depends on how the product is used:

• Leave-on products (lotions, serums, perfumes, anything that stays on skin): disclosure required above 0.001%, which is 10 ppm.
• Rinse-off products (cleansers, shampoos, soap): disclosure required above 0.01%, which is 100 ppm.

Those thresholds are low. A lemongrass-forward leave-on lotion at a typical fragrance load can clear the leave-on trigger without you having added a single drop of isolated citral, purely from what's naturally present in the essential oil itself.

Doing the math on your formula

The calculation isn't complicated, but it does require knowing the actual citral content of the specific oil lot you're using, since natural variation between crops and distillation batches is real. Multiply the citral percentage within the essential oil by the oil's use level in your finished formula. A lemongrass oil that's a meaningful percentage citral, used at even a modest inclusion rate in a leave-on lotion, will often land above the 10 ppm leave-on threshold and need to appear on both your CNF and your label once the April 2026 deadline hits.

Source oil	Typical role	Disclosure relevance
Lemongrass oil	Fragrance, insect-repellent folklore use	High citral content, frequently triggers disclosure
Lemon myrtle oil	Fragrance, "lemon" marketing claims	Very high citral content in many lots
May Chang (litsea cubeba)	Fragrance, softer lemon note	Meaningful citral content
Sweet orange oil	Fragrance	Low citral relative to limonene content

What to actually do about it

• Get a current certificate of analysis or supplier documentation for citral percentage in any citrus-forward essential oil you use, rather than relying on a generic industry average.
• Run the concentration math for both your current formula and any reformulations planned before April 2026.
• Flag citral-heavy oils for closer stability monitoring, given the oxidation issue.
• Don't assume "no added citral" means no disclosure. Natural occurrence in essential oils counts.

Cosmetic Comply's ingredient matching step is built for exactly this kind of question, since it maps essential oil components down to INCI and carries the percentage math through so you're not doing citral arithmetic by hand on a spreadsheet at eleven at night before a launch date.