Alpha-Humulene (Hops Monocyclic Sesquiterpene · Anti-inflammatory · Anti-tumour · Cannabis Terpene)

Compound	Alpha-Humulene (α-Humulene; α-Caryophyllene)
Chemical class	Terpenoid — Sesquiterpene (Monocyclic 11-membered ring sesquiterpene; humulene)
CAS	6753-98-6
Primary source	Humulus lupulus (hops, cone essential oil), Cannabis sativa, Salvia officinalis, clove
Key applications	Anti-inflammatory (systemic CB2 pathway); anti-tumour (oral administration active); antibacterial; appetite suppressant
Claim strength	Moderate
Typical form	Hops essential oil constituent; cannabis terpene profile; alpha-humulene isolate
Buy from Herbuno	Hops Flower Extract Powder - Humulus lupulus →

Name origin: From Humulus (the hops genus). Alpha-humulene is also historically called α-caryophyllene — it is actually an isomer of beta-caryophyllene (same molecular formula C15H24) but with a different ring structure (11-membered monocyclic ring vs bicyclic ring in BCP). The two compounds co-occur in the same plants (hops, cannabis, clove, black pepper) and are often considered pharmacologically complementary, with BCP as the more extensively studied. Cannabis terpene profile: Alpha-humulene is one of the more abundant terpenes in Cannabis sativa essential oil — present at 10–40% of the terpene fraction in many cultivars. Its presence (alongside BCP, myrcene, linalool) is part of the terpene entourage profile increasingly documented for different cannabis chemotypes. Pharmacological interest: While BCP’s CB2 agonism is its defining mechanism, alpha-humulene’s anti-inflammatory activity appears to operate differently — without direct CB2 binding in some studies, suggesting additional mechanisms including NF-κB inhibition, COX-2 inhibition, and potentially different receptor interactions. A distinctive property: alpha-humulene is active as an anti-tumour agent via oral administration in animal models (BCP requires injection for some tumour models), suggesting better oral bioavailability for certain anticancer effects. Commercial source: Hops Flower Extract Powder from Herbuno delivers alpha-humulene as part of the hops terpene and bitter acids complex.

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Evidence for Alpha-Humulene Applications

Anti-inflammatory — topical and systemic: Alpha-humulene reduces carrageenan-induced paw oedema and dextran-induced oedema in animal models via systemic and topical routes. A Brazilian research group (Fernandes et al., 2007, Eur J Pharmacol) characterised alpha-humulene as a potent topical and systemic anti-inflammatory sesquiterpene with comparable anti-inflammatory potency to indomethacin at equipotent doses in acute rodent models. The mechanism involves COX-2 inhibition and inhibition of neutrophil migration. Claim strength: Moderate (animal; mechanism).

Anti-tumour via oral route: Alpha-humulene shows anti-tumour activity in animal xenograft and syngeneic tumour models when administered orally — a notable distinction from some sesquiterpenes that require parenteral delivery for efficacy. The anti-tumour mechanism involves apoptosis induction via ROS generation and NF-κB inhibition. Claim strength: Emerging (animal; no human data).

Appetite suppressant (putative): Some cannabis terpene research suggests alpha-humulene may contribute to appetite-suppressing effects of certain cannabis cultivars (as opposed to myrcene’s sedating/appetite-stimulating effects). The mechanism is hypothetical — possible CB1 modulatory activity without agonism. Claim strength: Emerging.

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Frequently Asked Questions — Alpha-Humulene

Is alpha-humulene the same as beta-caryophyllene?
No — they are structural isomers (same molecular formula C15H24, different arrangement). Beta-caryophyllene has a bicyclic ring system (cyclobutane fused to a nine-membered ring) and is a selective CB2 agonist. Alpha-humulene has an 11-membered monocyclic ring and does not bind CB2 with the same affinity. They co-occur in the same plants and are often analysed together in cannabis terpene profiling. Their anti-inflammatory activities are additive in combination, making them complementary rather than redundant in full-spectrum plant extracts.

What makes hops a medicinal plant beyond brewing?
Hops (Humulus lupulus) is primarily known as a bittering agent in beer brewing, but contains a rich medicinal phytochemistry: (1) bitter acids (alpha-acids/humulones; beta-acids/lupulones) — antibacterial, sedative precursors of 2-methyl-3-buten-2-ol during fermentation; (2) 8-prenylnaringenin — the most potent phytoestrogen known; (3) xanthohumol — prenylated chalcone with anticancer properties (built SM4); (4) alpha-humulene and beta-caryophyllene — anti-inflammatory terpenes; (5) myrcene — sedating monoterpene; (6) linalool — anxiolytic. Hops extracts have EU traditional use status for mild anxiety and sleep disorders.

Does alpha-humulene contribute to the smell of cannabis?
Alpha-humulene is one of several sesquiterpenes contributing to cannabis aroma — it has a woody, earthy, herbal scent. In cannabis cultivars where alpha-humulene is abundant, it contributes to the more herbal/woody fragrance notes alongside beta-caryophyllene (spicy, clove-like) and myrcene (earthy, musky). The cannabis terpene profile is increasingly used to characterise cultivar identity and predict subjective effects in the medical cannabis industry, with alpha-humulene associated with more “energising” and less sedating effects compared to myrcene-dominant cultivars.

Is alpha-humulene measured in cannabis testing?
Yes — alpha-humulene is included in standard cannabis terpene panel analyses (COA from licensed cannabis testing laboratories) alongside BCP, myrcene, limonene, linalool, alpha/beta-pinene, and terpinolene. Most licensed cannabis markets (Canada, US state markets, Netherlands, UK medical cannabis) require full terpene profiling by GC-MS or GC-FID. The growing “whole-plant” and “full-spectrum” cannabis extract market has increased interest in alpha-humulene as a contributor to the therapeutic terpene profile beyond CBD and THC content alone.

Related compounds: Beta-Caryophyllene, Myrcene, Linalool, Xanthohumol

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Claim-strength scale – High = multiple human RCTs; Moderate = limited trials or strong preclinical convergence; Emerging = early-stage lab or animal data.

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