Parthenolide
The potent feverfew allergen — the textbook sesquiterpene lactone behind daisy-family contact allergy
INCIParthenolide
- Category
- Botanical
- Risk level
- medium
- A potent sensitiser
- One of the most studied sesquiterpene lactones — its α-methylene-γ-lactone group is highly reactive with skin proteins
- The Compositae prototype
- Understanding parthenolide explains why chamomile, arnica, yarrow and feverfew all cross-react
- A positive means "avoid the family"
- A parthenolide-positive patch test should prompt avoidance of all Compositae botanicals in skincare
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This ingredient may appear under any of these names:
Commonly found in
Possible reactions
- Allergic contact dermatitis from feverfew-containing products
- Airborne dermatitis from handling the plant
- Cross-reactions with other Compositae (daisy-family) allergens
- Facial dermatitis from feverfew-based skincare
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What is parthenolide?
Parthenolide is a naturally occurring sesquiterpene lactone found chiefly in feverfew (Tanacetum parthenium), a member of the Compositae/Asteraceae (daisy) family. It's the principal active — and allergenic — compound in feverfew, a herb with traditional use for migraine and marketed topically in some "natural" anti-redness and anti-aging products.
Parthenolide carries the structural signature of Compositae allergenicity: an α-methylene-γ-butyrolactone group, a highly electrophilic element that bonds readily with cysteine residues in skin proteins. That hapten-forming reactivity makes it a potent contact sensitiser — and the prototype for understanding the whole sesquiterpene-lactone allergen class.
Why it causes reactions
Parthenolide's α-methylene-γ-lactone is a classic Michael acceptor: it forms covalent bonds with skin-protein thiol groups under ordinary conditions, creating immunogenic haptens and driving Type IV delayed hypersensitivity.
Its cross-reactivity is the clinically important part. Any daisy-family plant rich in similar sesquiterpene lactones can cross-react, including:
- Chamomile (matricin and others)
- Arnica (helenalin)
- Yarrow (achillin)
- Chrysanthemum, sunflower, dandelion
So parthenolide sensitisation rarely stays confined to feverfew.
Some skincare uses parthenolide-depleted feverfew, processed specifically to remove this allergen while keeping the marketed benefits — so a "feverfew" label isn't automatically a red flag. Where parthenolide is present, though, it's a genuine sensitiser, and a positive patch test means treating the whole daisy family as suspect.
Where it's found
- Feverfew creams and extracts — topical products using feverfew as an active.
- "Natural" anti-redness / anti-aging skincare using feverfew.
- Oral feverfew supplements (migraine) — oral use rarely causes contact allergy but can cause oral allergy symptoms.
On labels: Tanacetum Parthenium Extract / Feverfew Extract (and, rarely, Parthenolide as an isolated compound). Also watch cross-reactors: Chamomilla Recutita, Arnica Montana, Achillea Millefolium extracts.
Safer alternatives
- Non-Compositae anti-redness: centella asiatica, licorice root, niacinamide, azelaic acid.
- Gentle soothers: green tea (EGCG), oat extract (Avena sativa).
- Anti-aging without the family: peptides such as Matrixyl.
- Migraine: for oral feverfew users, evidence-based pharmaceutical prevention avoids botanical allergy.
The bottom line
Parthenolide is feverfew's potent allergen and the textbook sesquiterpene lactone behind daisy-family contact allergy — so a reaction to it implicates chamomile, arnica and the wider Compositae group, not feverfew alone. Note that some cosmetic feverfew is parthenolide-depleted; where it isn't, switch to non-daisy soothers like centella, licorice or niacinamide and confirm with patch testing.
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