Alpha-terpineol

PhytochemicalTerpene

What is it

Alpha-terpineol is a naturally occurring monoterpene alcohol found in many essential oils (pine, eucalyptus, tea tree, cajeput). It is used in flavoring, fragrance, and as an aromatic component of some supplements and topical products.

Evidence for 1 use

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

Antimicrobial activity

Mixed Evidence

In vitro antimicrobial activity is documented for alpha-terpineol and the essential oils containing it. Direct clinical evidence for isolated alpha-terpineol is lacking.

How it works

Alpha-terpineol has been studied for antimicrobial, anti-inflammatory, antioxidant, and analgesic activities in vitro and in animal models. It can penetrate skin readily and may enhance transdermal absorption of co-administered compounds. As a major component of tea tree oil and pine oil, much of its biological activity is attributed to these essential oils rather than to alpha-terpineol in isolation. Internal supplementation with isolated alpha-terpineol is uncommon.

Dosage

No established supplement dose. JECFA ADI for use as a flavoring is 0-1 mg/kg/day. Essential oil products containing alpha-terpineol vary widely in concentration.

When and how to take it

Not typically a standalone supplement; included as part of essential oil products or as a flavoring at trace levels.

1 commercial form

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

Alpha-terpineol (flavoring/fragrance)

Component of many natural product formulations.

Used at low concentrations

Safety

GRAS for flavoring use. At higher concentrations or with prolonged skin contact, can cause irritation or sensitization. Ingestion of large amounts of essential oils containing alpha-terpineol can cause CNS depression and GI symptoms.

Who should be cautious

Avoid ingestion of concentrated essential oils. Pregnancy and lactation: limit exposure to therapeutic doses. Keep essential oils away from children.

Interactions

Limited data on drug interactions. May enhance skin penetration of co-applied substances.

Frequently asked questions

Is alpha-terpineol safe?⌄

Safe at typical flavoring concentrations. Concentrated essential oils should not be ingested in significant amounts.

Why is alpha-terpineol in my supplement?⌄

It is typically a natural component of essential oils or a flavoring agent, not added for direct biological effects.

References

Alpha-terpineol on Wikidata — Wikidata link

Alpha-terpineol (ChEBI:22469) — ChEBI link

Alpha-terpineol (PubChem CID 17100) — PubChem link

Alpha-terpineol on NIH DSLD (US supplement label database) — NIH Dietary Supplement Label Database link

Research on Alpha-terpineol (PubMed search) — PubMed link

Track Alpha-terpineol 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.