Diallyl disulfide is one of the signature sulfur volatiles of garlic oil and a major organosulfur constituent in the AromaForge garlic record. Compared with many aroma constituents, it has a relatively large preclinical literature: reviewed studies repeatedly describe antioxidant, inflammation-modulating, and chemoprevention-related findings in cell and animal models, often involving Nrf2 activation and reduced NF-kB signaling. That evidence remains preclinical and should not be translated into medical claims, but it is materially stronger than a simple identity-only profile.
Chemical identity and composition
PubChem lists diallyl disulfide as C6H10S2 with IUPAC name 3-(prop-2-enyldisulfanyl)prop-1-ene. In the local archive's China garlic oil record, diallyl disulfide appears at 17.24%, making it one of the dominant volatile sulfur constituents in that GC profile.
Aroma and practical use
- Use the recorded garlic, pungent, sulfury, savory, sulfurous 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.
hepatic oxidative stress and inflammation model
A Food Chem Toxicol abstract reported that oral diallyl disulfide pretreatment attenuated liver injury, reduced inflammatory mediators, inhibited NF-kB activation, and increased Nrf2-linked antioxidant defense in rats challenged with carbon tetrachloride.
Measured: transaminases, histology, apoptosis markers, NF-kB, Nrf2, antioxidant enzymes
This experimental finding does not establish benefit, dose or safety in people using this blend.
cigarette smoke extract emphysema model
A full-text Nutrients paper reported that diallyl disulfide lowered inflammatory cell influx and cytokines, reduced MDA and MPO, improved antioxidant markers, and inhibited NF-kB-associated signaling in a rat emphysema model.
Measured: BALF cell influx, TNF-alpha, IL-1beta, IL-6, oxidative stress markers, NF-kB
This experimental finding does not establish benefit, dose or safety in people using this blend.
lps driven macrophage inflammation
A 2022 abstract reported that diallyl disulfide increased nuclear Nrf2 and its target genes while reducing ROS, NO, TNF-alpha, NF-kB and MAPK activation in macrophages and reducing liver inflammatory injury in LPS-challenged mice.
Measured: Nrf2 targets, ROS, NO, TNF-alpha, NF-kB, MAPK, NLRP3
This experimental finding does not establish benefit, dose or safety in people using this blend.
constituent level antifungal activity
A Molecules full-text study of garlic oil constituents found that diallyl disulfide showed antifungal activity against two wood-rotting fungi, although diallyl trisulfide was the most potent of the three major allyl sulfides tested.
Measured: IC50 against Trametes hirsuta and Laetiporus sulphureus
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.
No numeric constituent-specific use limit is available here. Missing is not an unrestricted-use clearance.
Human clinical case-report literature (allergic contact dermatitis and photocontact allergy) confirms diallyl disulfide as a documented skin sensitizer/allergen in garlic-exposed individuals, corroborating the existing sensitizing:true flag; no numeric IFRA/EU Annex III dermal percentage limit was located.
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.
No constituent-specific IFRA leave-on limit or phototoxic restriction was located in the reviewed public sources for isolated diallyl disulfide.
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.
The reviewed evidence for diallyl disulfide is dominated by cell and animal pharmacology models rather than human clinical trials, so archive language should avoid implying established therapeutic efficacy.
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 garlic sulfide-rich oils are generally treated as strongly irritating in practitioner safety summaries, constituent-level topical-marketing language should remain conservative even when mechanistic papers are positive.
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
nrf2 activation with phase ii enzyme upregulation
Primary rat and macrophage studies report that diallyl disulfide promotes Nrf2 nuclear translocation and increases downstream antioxidant targets such as HO-1, NQO1, and related defense enzymes.
This experimental finding does not establish benefit, dose or safety in people using this blend.
nf kb and mapk suppression
In macrophage and airway-inflammation models, diallyl disulfide reduced NF-kB activation, inflammatory cytokine output, and in some papers MAPK-linked inflammatory signaling.
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 (6)
- No human clinical trials specific to isolated diallyl disulfide were verified in this pass, though human case-report evidence confirms contact and photocontact allergy.
- No constituent-specific dermal sensitization threshold or numeric leave-on limit was located in the reviewed public sources.
- Most positive findings remain preclinical and should not be rewritten as direct consumer health claims.
- Worker c8 verification (2026-07-13): a RIFM fragrance ingredient safety assessment exists for allyl disulfide/diallyl disulfide (CAS 2179-57-9) per ResearchGate listing, but the numeric NESIL/MAC table could not be retrieved in this pass. Sensitizing:true is retained/confirmed on independent peer-reviewed evidence: diallyl disulfide is a documented garlic-allergy contact allergen (guinea pigs sensitized and cross-reacted to garlic; garlic-sensitive human patients test positive to diallyl disulfide, allylpropyl disulfide, allylmercaptan and allicin). No verified numeric dermal_limit_pct located, so it is left null rather than the prior unsourced 0.5% placeholder.
- No constituent-specific numeric dermal reference is available here.
- Some findings do not record an explicit exposure route; consult the linked study before applying them to a use.