Guide
What is hops? A plain guide
Hops is the cone-shaped flower (strobile) of Humulus lupulus, best known for flavoring beer; the same flower is also sold as an extract, standardized to compounds like xanthohumol, for traditional relaxation and sleep-support use.
Hops is the cone-shaped flower — botanically, the strobile — of Humulus lupulus, a climbing perennial plant. Most people know it as the ingredient that gives beer its bitterness and aroma. This page is about hops as a dietary supplement, sold as capsules, extract or dried flower, not about hops for brewing or homebrewing.
A quick note on beer and brewing
If you landed here looking for brewing information — alpha acid content, hop varieties, how much to add to a boil — that's a separate use of the same plant, and outside what this page and its research citations cover. Everything below is about hops taken as a supplement.
What plant it comes from
Hops is a member of the Cannabaceae family, the same family as hemp, though the two plants and their chemistry are distinct. The part used is the strobile: a papery, cone-like cluster of bracts that forms on the female plant and is harvested, dried, and either used whole or processed into an extract or pellet form.
The compounds researchers study
Hops contains bitter acids — humulone and related alpha acids, lupulone and related beta acids — along with an essential oil and a group of prenylated flavonoids. The most abundant of these is xanthohumol; related compounds include isoxanthohumol and 8-prenylnaringenin (usually abbreviated 8-PN), which a 2019 pharmacology review describes as one of the most potent phytoestrogens identified to date (PMID 30608650). That same review notes hop compounds have been studied in the lab for antioxidant, anti-inflammatory and metabolic activity, including an antiobesity effect seen with xanthohumol-rich extracts in lab and animal models, thought to work through the AMPK energy-signaling pathway — a proposed mechanism, not a demonstrated effect in a human trial (PMID 30608650). A national reference database summarizes the same basic profile: bitter acids, flavonoids, phytoestrogens and essential oil (PMID 30000893).
How it's thought to work
The honest answer is that the mechanism is proposed, not settled. A 2004 laboratory study testing a fixed valerian-hops extract combination against a panel of brain receptors found some binding activity at melatonin and serotonin receptor subtypes — and the same study states plainly that hops' use in sleep remedies is "mainly based on traditional use and scarce scientific information," a more limited evidence base than valerian's (PMID 15636177). A 2025 animal study using a xanthohumol- and humulone-containing hop extract found it increased deep, slow-wave sleep in a rodent model and bound directly to the GABA-A receptor — the same general receptor system implicated in prescription sedatives — but the doses tested (100-200 mg per kilogram of body weight) were only ever given to animals, not people, and don't translate directly into a human dose (PMID 39522843).
Forms it's sold in
Hops supplements come as standardized extract capsules (often standardized to a percentage of xanthohumol or combined with valerian for sleep-focused blends), dried flower for tea, and liquid or tincture extract. See how to choose a good hops for what to look for on a label, and hops powder and liquid for how the powder and liquid forms compare.
Regulatory and safety snapshot
Hops is Generally Recognized As Safe (GRAS) as a food ingredient by the FDA, and a national reference database describes it as generally associated with sedation and, rarely, allergic reaction (PMID 30000893). That's a starting point, not the full safety picture — see hops side effects and who should not take hops? for more detail.
Questions people ask
What is hops extract?
It's a concentrated preparation made from the dried flower (strobile) of Humulus lupulus, standardized to one or more of its studied compounds — commonly xanthohumol or the bitter acids — and sold as capsules, powder or liquid, usually for traditional relaxation or sleep-related use rather than brewing.
What is hops flower extract used for?
Traditionally, as a mild sedative, often paired with valerian in sleep-support blends. See hops benefits: what the research does and doesn't show for what the actual trials found, which is more limited than the traditional reputation suggests.
Is hops extract estrogenic?
One of its compounds, 8-prenylnaringenin, is described in a 2019 pharmacology review as one of the most potent phytoestrogens identified so far (PMID 30608650). That's a real, lab-documented property, and a reason some people — particularly with hormone-sensitive conditions — should ask a doctor before use; see who should not take hops?.
Is hops extract alcoholic?
Hops extract itself isn't alcoholic. Some liquid tincture preparations use alcohol as the extraction solvent and carrier, in which case the finished product contains a small amount — check the label of a specific liquid product if that matters to you.
Is hops extract halal?
That depends on the specific product's extraction method and other ingredients (a tincture made with an alcohol carrier is a relevant factor for some), not on the hops plant itself. Check a specific product's certification or ask the manufacturer.
Related reading: hops benefits: what the research does and doesn't show, how much hops should you take a day?, and how to choose a good hops.
Sources
- The Multiple Biological Targets of Hops and Bioactive Compounds A 2019 pharmacology review describes hops' main compounds (xanthohumol, 8-prenylnaringenin) and their lab-level activities, including one of the most potent phytoestrogens known, an antiobesity mechanism seen with concentrated xanthohumol extracts, and inhibition of several liver drug-metabolizing enzymes — laboratory and mechanistic findings, not a clinical outcome in people taking a hops supplement.
- Hops A national reference database describes hops as containing bitter acids, flavonoids, phytoestrogens and essential oil, notes its GRAS food status, and describes sedation as a known effect and allergy as rare.
- In vitro binding experiments with a Valerian, hops and their fixed combination extract (Ze91019) to selected central nervous system receptors A 2004 lab (in vitro) study found a valerian-hops extract combination bound to some melatonin and serotonin receptor subtypes, while explicitly noting that hops' traditional use as a sleep remedy rests on scarce scientific evidence.
- Sleep-enhancing effect of Hongcheon-hop (Humulus lupulus L.) extract containing xanthohumol and humulone through GABA(A) receptor A 2025 animal study found a xanthohumol- and humulone-containing hop extract increased deep sleep in a rodent model by binding the GABA-A receptor, at doses (100-200 mg per kg of body weight) that were only tested in animals, not people.
*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.