Calendic Acid: What It Is and Why Seed Oil Is Not Our Oil

Calendic acid is a real and unusual fatty acid, but it is a calendula seed oil story, and we make our oil from the flowers. In the one seed-oil study we cite below, calendic acid made up 51-58% of the fatty acids. We could not find any published analysis showing a comparable amount in a petal-infused oil. So when a page says calendula oil is "rich in calendic acid," the useful reply is a question: which oil, from which plant part, and where is the analysis?

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What the measured numbers actually describe

Dulf et al. (Chemistry Central Journal, 2013) analysed seeds of eleven pot marigold genotypes grown in Romania. Calendic acid, a fatty acid with three conjugated double bonds, was the predominant one: 51.4-57.6% of total-lipid fatty acids, and 45.7-54.7% within the triacylglycerol fraction (the seed's storage fat). Linoleic acid came second at 28.5-31.9% of total lipid. The paper's introduction repeats an older figure of "about 60%," which is higher than the authors' own measurements, so we use their measured range.

The same paper shows where in the seed the compound sits. For the genotype it tabulates in detail, calendic acid was 54.67% of the triacylglycerol fatty acids but only 4.29% of the polar (membrane) lipids and 4.64% of the sterol esters. It is a feature of the seed's stored fat. That is why "calendula seed oil" is a recognisable material, and why it is a different ingredient from a flower infusion.

One more correction to a common line. Calendic acid is often described as found only in calendula. We could not source that exclusivity claim in the papers we read, so we do not repeat it; what the evidence supports is narrower: calendula seed oil is a documented, rich source.

What petals contain, as far as anyone has measured

A small Macedonian study (Rafajlovska et al., 2012) extracted dried petals with n-hexane and profiled the fatty acids: oleic 42.23%, linoleic 16.60%, an 18:3 peak listed as linolenic 11.69%, palmitic 10.89%, stearic 7.28%, myristic 6.44%. Calendic acid was not reported, though the method may not separate conjugated from ordinary 18:3 (the paper does not say). Hexane pulled out 13.76% of the petals' dry weight.

A 2022 phytochemical review (Olennikov and Kashchenko, Molecules) lists alpha-calendic acid as occurring in flowers and leaves as well as seeds, with no amounts. Two honest conclusions follow. We cannot say calendic acid is absent from petals. Equally, no source we read quantifies it there, and the only quantities we could verify are for seed oil.

Why the carrier sets most of an infused oil's fatty acids

This section is our reasoning from the numbers above, not a measurement; we found no published fatty acid analysis of a calendula-infused oil. The EU herbal monograph (EMA/HMPC, 2018) lists an oil extract of calendula flowers at 1:10 in a fatty vegetable oil such as olive oil. At that reference ratio, 10 g of dried petals sit in about 100 g of oil. Even if every gram of hexane-soluble material in the petals (13.76% of dry weight, from the Macedonian study) moved into the oil, that is about 1.4 g of lipid in 100 g, roughly 1.4% of the finished oil, and that lipid is oleic and linoleic in character, not calendic-rich. That ratio is the EU reference, not a statement of our own, and we do not publish a composition for our oil.

One caution cuts the other way. Laskos et al. (Scientific Reports, 2025) found that macerating basil or sage at 200-400 g of herb per litre shifted the fatty acid proportions of some cold-pressed oils. That was other herbs, other oils and very high herb loads, but it is why we say "mostly the carrier's" and not "exactly the carrier's."

Reasoning from that, the practical consequence is that the carrier tells you more about the feel and stability of an infused oil than the calendula does. A commercial calendula macerate data sheet (Golgemma/Biolandes, 2025) names sunflower oil as the carrier and lists 0.2% added tocopherol. And "sunflower oil" alone is not one thing: USDA reference values (FoodData Central, SR Legacy) give about 65% linoleic acid for the linoleic type and about 83% oleic acid for the high-oleic type. If you are comparing infused oils, the carrier is the first thing to ask about. If you want ours, ask us for the carrier on the batch paperwork.

Reading a label: flower, seed, extract

Ingredient names do carry information. The Cosmetic Ingredient Review panel's 2010 safety assessment (Andersen et al., Int J Toxicol) treats calendula flower oil and calendula seed oil as separate cosmetic ingredients. A product that lists only a carrier plus a calendula flower extract is telling you it is an infusion; a product listing seed oil is a different material. If a label or a product page claims a calendic acid content, ask for the analysis and the sample it was run on.

A practical test for any calendic acid claim

Four questions sort most of these claims quickly. Which plant part was analysed: seed, petal, whole flower? Was the number measured on the finished oil or taken from a seed-oil paper? What is the carrier, since at a ratio like 1:10 it supplies most of the lipid? And can the seller show the analysis and say who ran it? A claim that survives all four is a claim about a specific product. One that does not is borrowed from the seed-oil literature.

What this article does not claim

We make no statement about what calendic acid does on skin. The sources we relied on measure where it occurs, not what it does when applied, and a fatty acid being unusual is not evidence that it matters to a user. Our own oil is a whole-flower infusion: petals are separated by hand from sound, whole-dried flower heads, and calendula is extracted first and then brought into a carrier. Each batch is tested by independent third-party labs and documented on request (email the lot number to [email protected]). If you need a fatty acid profile for a formulation, ask what the batch assays cover before you assume.

For related questions see calendula essential oil versus infused oil, cold-pressed versus infused, and why the oil is golden. How we handle the flowers is on where it comes from.

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Sources & Further Reading