alpha-Farnesene is a sesquiterpene hydrocarbon found in several floral, fruit, and spice-style oils in the AromaForge archive, including ylang-ylang grades and fresh ginger. Public literature around this constituent is strongest in plant and insect chemical ecology rather than human pharmacology: it is repeatedly discussed as a volatile signal compound, and its oxidation chemistry is well known in postharvest apple and pear research. That makes alpha-farnesene useful for identity, odor, and mechanism notes, but not for medical-style claims.
Chemical identity and composition
PubChem lists farnesene as a sesquiterpene hydrocarbon with formula C15H24, and NIST identifies alpha-farnesene under CAS 502-61-4 for the trans,trans species. The archive uses both a generic alpha_farnesene record and a separate (E,E)-alpha-farnesene record where a source specifies the exact isomer.
Aroma and practical use
- Use the recorded green, woody, floral, vegetative, fresh descriptors to explore a blend's scent character; perceived strength also depends on the other ingredients.
- Review the flagged use concerns across every contributing oil and the selected dilution.
- Read the route, preparation and experimental context before using a study finding to choose an oil.
Reported benefits and effects
Findings retain their study context. An animal or laboratory result describes that experiment.
superficial scald oxidation
A Journal of Agricultural and Food Chemistry paper reported that oxidation products derived from alpha-farnesene, including farnesyl hydroperoxide and related conjugated triene products, induced superficial-scald symptoms in stored apples.
Measured: superficial scald symptom induction
This experimental finding does not establish benefit, dose or safety in people using this blend.
scald control relationship
USDA-authored apple-storage work evaluated alpha-farnesene oxidation alongside superficial scald control and reinforced the practical importance of limiting alpha-farnesene oxidative chemistry during storage.
Measured: relationship between scald control and alpha-farnesene oxidation
This experimental finding does not establish benefit, dose or safety in people using this blend.
ants aphids mutualism
A Current Biology report described Z,E- and E,E-alpha-farnesene as trail-pheromone components that suppressed aphid walking dispersal, while the major isomer also increased aphid reproduction rate in that interspecies mutualism context.
Measured: walking dispersal and aphid reproduction
This experimental finding does not establish benefit, dose or safety in people using this blend.
Use concerns and concentration limits
Sensitization concernFlagged
Flagged in the constituent reference; assess the source, route and finished-product concentration.
Phototoxicity concernNot flagged
Not flagged in the current model. This is not proof of absence or unrestricted safety.
Oxidation concernNot flagged
Not flagged in the current model. This is not proof of absence or unrestricted safety.
Penetration enhancementNot flagged
Not flagged in the current model. This is not proof of absence or unrestricted safety.
A recorded constituent reference, not a recommended oil dilution. Product category, source applicability and all contributing oils must be checked before use.
unverified reference · No source provenance attachedA recent BASF/Isobionics alpha-farnesene SDS identifies the material as requiring standard irritant-contact precautions, protected storage, and protection from heat, sunlight, and oxygen-sensitive handling conditions.
This reference does not establish a therapeutic result or a safe use level for a custom oil blend.
No direct public citation is attached to this entry.
A separate fragrance-mixture SDS containing alpha-farnesene classified the mixture for skin irritation, skin sensitization, aspiration hazard, and aquatic toxicity; that is mixture-level evidence rather than a pure-compound toxicology monograph.
This reference does not establish a therapeutic result or a safe use level for a custom oil blend.
No direct public citation is attached to this entry.
Because alpha-farnesene is highly unsaturated and oxidation-prone, oxidized material should be handled more cautiously than fresh material.
This reference does not establish a therapeutic result or a safe use level for a custom oil blend.
No direct public citation is attached to this entry.
Constituents it may interact with
No constituent-pair interaction is recorded for this identity. The report does not assume either amplification or incompatibility.
How the effects were investigated
autoxidation to conjugated trienes
Postharvest studies identify alpha-farnesene as a readily oxidized sesquiterpene that forms conjugated triene hydroperoxide and trienol products associated with superficial scald development in apples and pears.
This experimental finding does not establish benefit, dose or safety in people using this blend.
volatile behavioral signal
Ecology papers describe alpha-farnesene isomers as behaviorally active cues in insects, supporting its role as a semiochemical rather than a therapeutic constituent.
This experimental finding does not establish benefit, dose or safety in people using this blend.
What this report cannot establish
- A reported constituent percentage does not establish an effective human therapeutic dose or the amount absorbed into the body.
- The presence of a constituent does not guarantee a clinical benefit, rash treatment or sleep improvement from a custom blend.
- An unflagged concern or missing use limit does not establish safety for ingestion, inhalation, skin exposure or a particular person.
- A candidate constituent interaction does not establish that two oils amplify one another at the selected proportions.
- Constituent descriptors alone do not establish a precise top, heart or base lifetime in a finished blend.
Known data gaps (5)
- No human clinical studies specific to isolated alpha-farnesene were verified in the reviewed public sources.
- Much of the strongest alpha-farnesene literature is ecological or postharvest-plant chemistry rather than topical aroma-use research.
- A July 2026 verification pass (RIFM/IFRA and general web literature search) did not locate a dedicated RIFM/IFRA fragrance ingredient safety assessment or authoritative dermal-limit figure for alpha-farnesene; the existing 25% dermal_limit_pct and sensitizing:true flag remain unverified against a primary citation.
- The numeric dermal reference lacks source provenance; a verified flag alone is insufficient.
- Some findings do not record an explicit exposure route; consult the linked study before applying them to a use.