Ingredient · dataset v56
Hazelnut Seed Oil and fungal acne
May trigger · Moderate evidence
Why it's a potential trigger
Rich in oleic and related long-chain unsaturated fats that Malassezia yeast's fat-splitting enzymes free and its uptake enzymes accept.
Explicit row under the fatty-oil rule (same basis as the ruled seed oils); not individually feeding-tested.
Evidence strength
Moderate evidence (2/3)
Function
Oil
Plant oils: triglyceride oils and butters the yeast harvests after its enzymes split them.
Also listed as
Corylus Avellana Seed Oil, Corylus Avellana (Hazelnut) Seed Oil, Hazelnut Oil
Products without this ingredient
- SEEN Body Wash Fragrance Free 10 fl oz
- Avene Cleansing Foam
- Fresh Monster Kids Hair Gel, Flexible Hold, No Added Fragrance 6 oz
- Maybelline New York Fit Me Loose Finishing Powder
- Trace Minerals Bentonite Clay Detox Powder 16 oz
- COSRX Low pH Niacinamide Micellar Cleansing Water 400 ml
Related oil
- Acai Fruit Oil — May trigger · Moderate evidence
- Apricot Kernel Oil — May trigger · Moderate evidence
- Argan Oil — May trigger · Moderate evidence
- Avocado Oil — May trigger · Moderate evidence
- Babassu Seed Oil — May trigger · Moderate evidence
- Baobab Seed Oil — May trigger · Moderate evidence
- Black Currant Seed Oil — May trigger · Moderate evidence
- Borago Officinalis Seed Oil — May trigger · Moderate evidence
Sources
- Brunke & Hube 2006 — MfLIP1 extracellular lipase hydrolyses Tweens (Microbiology)
- Mayser et al. 1995 — ester hydrolysis depends on alcohol moiety (Acta Derm Venereol)
- EU CosIng database — search the INCI name
Last reviewed: 2026-10-13 (dataset v56).
Questions
Does Hazelnut Seed Oil trigger fungal acne?
We flag it as a potential trigger (moderate evidence). That means it belongs to a class the Malassezia yeast is known to feed on — not that every product with it will cause a flare. Concentration, formulation and individual skin chemistry matter.
Does Hazelnut Seed Oil feed Malassezia?
Yes: we flag Hazelnut Seed Oil as a potential trigger (moderate evidence). It belongs to a class Malassezia is known to feed on — not a claim that every product with it causes a flare. Concentration, formulation and individual skin chemistry matter.
How confident is this call?
Moderate evidence: Rich in oleic and related long-chain unsaturated fats that this yeast's fat-splitting enzymes free and its uptake enzymes accept.
Is this medical advice?
No. We screen ingredient lists; we never diagnose, treat, or certify products. When in doubt, ask a dermatologist.
Check a full list containing Hazelnut Seed Oil →
Not medical advice: we screen ingredient lists for potential triggers — we never diagnose, treat, or certify products. Dataset v56.