Farnesol

PhytochemicalSesquiterpene

What is it

Farnesol is a sesquiterpene alcohol naturally present in many essential oils (citronella, neroli, jasmine, lemongrass, rose, ylang-ylang). It is widely used as a flavor and fragrance compound and is being studied for antifungal and anticancer properties.

Evidence for 2 uses

AI-assisted evidence assessment — talk to your doctor before relying on any single supplement.

Antifungal / antibacterial (preclinical)

Mixed Evidence

In vitro and animal data; limited human evidence.

Flavor / fragrance use

Mixed Evidence

Used for scent; not a nutrient.

How it works

Farnesol has antimicrobial activity, particularly against Candida albicans, where it acts as a quorum-sensing molecule inhibiting yeast-to-hyphal transition. It also interferes with mevalonate pathway and induces apoptosis in certain cancer cell lines in preclinical studies. Topically and in food-flavor contexts, farnesol contributes to scent and antimicrobial activity. Human clinical evidence for therapeutic use is limited; most uses are flavor, fragrance, and antimicrobial topical.

Dosage

No established RDA. Used in trace flavor amounts (usually less than 0.1%).

When and how to take it

Not applicable as a flavor.

1 commercial form

Compare the main delivery options and what they’re best suited for.

Essential oil component

Found in many floral and citrus essential oils.

Volatile.

Safety

Considered safe at typical flavor exposure. Topical application may cause skin sensitization in some individuals; it is a known allergen in cosmetic context. High oral doses have not been well characterized for safety.

Who should be cautious

Avoid topical use in those sensitized to farnesol (declared allergen in EU cosmetics).

Interactions

No significant interactions at flavor levels.

Food sources

Citrus and herb essential oils

Amount
trace
%DV
—

Frequently asked questions

Is farnesol safe in cosmetics?⌄

Yes at typical use levels, though it is a labeled cosmetic allergen and can cause skin reactions in some people.

Does farnesol fight Candida?⌄

It has antifungal activity in vitro; clinical use as an antifungal is not established.

References

Farnesol on Wikidata — Wikidata link

Farnesol on NIH DSLD (US supplement label database) — NIH Dietary Supplement Label Database link

Research on Farnesol (PubMed search) — PubMed link

Track Farnesol with Pilora

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Evidence-based·How we grade evidence

Disclaimer: These statements have not been evaluated by the FDA. This page is educational, not a substitute for personalized medical advice. Evidence grades are AI-assisted assessments — talk to your doctor before starting any new supplement, especially if you’re pregnant, breastfeeding, on medications, or managing a chronic condition.