Hops — Benefits Deep Dive

Hops are a strange case among medicinal herbs. Almost everyone has consumed them, in beer; they are approved in Europe as a traditional herbal medicine for stress and sleep; one of their compounds is among the most powerful plant oestrogens ever measured; another is the subject of hundreds of laboratory papers on cancer, metabolism and skin. And yet the core clinical question — what do hops, on their own, do for people? — has barely been tested.

These four articles set out what is actually established. In short: valerian–hops combinations have modest, partly positive results for mild insomnia, and two trials of other hop-containing mixtures were negative; one small pilot trial found that hops alone reduced stress, anxiety and depression scores in young adults; menopause trials of the hop phytoestrogen 8-prenylnaringenin conflict, and reviews disagree about them; xanthohumol research is overwhelmingly preclinical; and the most serious safety finding concerns dogs, for whom eating hops can cause fatal hyperthermia.

Deep-Dive Articles

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Sleep and the Valerian Combination

Almost every positive sleep trial tested hops mixed with valerian. The 184-person U.S. trial with modest diary benefits and no laboratory difference, a 2025 sleep-tracker study, a three-herb comparison with zolpidem, two negative trials of other hop mixtures, the non-alcoholic beer study, and what the European regulator concluded.

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8-Prenylnaringenin and Menopause

The hop compound described as the most potent phytoestrogen known. What that ranking does and does not mean, why it was undetectable in most people after a large dose of its precursor, the animal hormone findings, conflicting hot-flush trials, and the open long-term safety questions.

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Xanthohumol Research

The most-studied hop compound, sorted by kind of evidence: human absorption data, animal studies on weight and blood sugar, a small human inflammation-marker study, the cancer and skin cell-culture literature, and a separate artery-function study of the beer-bitter isohumulones.

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Dog Poisoning, Allergy and Beer

Three veterinary case series of hops toxicosis in dogs, from five Greyhound-dominated cases to 177 poison-helpline calls; rare allergy and sedation in people; the breastfeeding question; liver-enzyme effects in the laboratory; and why beer is not a hops supplement.

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Table of Contents

  1. Deep-Dive Articles
  2. The Position, in One Page
  3. Evidence Ledger at a Glance
  4. Key Research: Sleep
  5. Key Research: Stress, Anxiety and Mood
  6. Key Research: 8-Prenylnaringenin and Hormones
  7. Key Research: Xanthohumol and Other Hop Compounds
  8. Key Research: Safety
  9. External Resources
  10. Connections

The Position, in One Page

What is solid

What is not

A point that is easy to miss

Two randomised trials of hop-containing mixtures — one with fatty acids, one with a five-ingredient complex — found no difference from placebo, partly because people taking placebo improved a great deal. Insomnia trials have large placebo responses, which is why uncontrolled reports of herbal sleep aids are hard to interpret.

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Evidence Ledger at a Glance

Ranked by how well established each item is.

  1. Established, human: hops are a common food ingredient through beer; LactMed reports GRAS status as a food in the United States.
  2. Established, veterinary: hops toxicosis in dogs, with hyperthermia in up to 96% of affected dogs in one series and deaths in every series.
  3. Modest, human, combination only: valerian–hops for mild insomnia.
  4. Negative, human, combination: two hop-containing sleep mixtures no better than placebo.
  5. Positive pilot, human, hops alone: lower stress, anxiety and depression scores in 36 young adults over four weeks.
  6. Conflicting, human: 8-PN for menopausal hot flushes.
  7. Human, pharmacokinetic and marker: xanthohumol absorption; reduced inflammatory response of blood cells in the lab after a dietary-level dose; better artery function for two hours after isohumulones.
  8. Animal: xanthohumol effects on weight, blood fats and blood sugar; 8-PN oestrogenic effects on the uterus and pituitary hormones.
  9. Cell culture: xanthohumol anticancer, antibacterial, anti-pigment and anti-inflammatory effects; liver-enzyme inhibition by valerian–hops extracts.
  10. Absent: hops-alone sleep trials, long-term hormonal safety, pregnancy and breastfeeding data, interaction studies in people.

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Key Research: Sleep

  1. Morin CM, Koetter U, Bastien C, et al. Valerian-hops combination and diphenhydramine for treating insomnia: a randomized placebo-controlled clinical trial. Sleep. 2005;28(11):1465-71. PubMed PMID: 16335333
  2. Schicktanz N, Gerhards C, Schlitt T, et al. Effects of a Valerian-Hops Extract Combination (Ze 91019) on Sleep Duration and Daytime Cognitive and Psychological Parameters in Occasional Insomnia: A Randomized Controlled Feasibility Trial. Brain and behavior. 2025;15(6):e70600. PubMed PMID: 40462685
  3. Maroo N, Hazra A, Das T. Efficacy and safety of a polyherbal sedative-hypnotic formulation NSF-3 in primary insomnia in comparison to zolpidem: a randomized controlled trial. Indian journal of pharmacology. 2013;45(1):34-9. PubMed PMID: 23543804
  4. Cornu C, Remontet L, Noel-Baron F, et al. A dietary supplement to improve the quality of sleep: a randomized placebo controlled trial. BMC complementary and alternative medicine. 2010;10:29. PubMed PMID: 20569455
  5. Scholey A, Benson S, Gibbs A, et al. Exploring the Effect of Lactium™ and Zizyphus Complex on Sleep Quality: A Double-Blind, Randomized Placebo-Controlled Trial. Nutrients. 2017;9(2). PubMed PMID: 28218661
  6. Franco L, Sánchez C, Bravo R, et al. The sedative effect of non-alcoholic beer in healthy female nurses. PloS one. 2012;7(7):e37290. PubMed PMID: 22815680
  7. Salter S, Brownie S. Treating primary insomnia - the efficacy of valerian and hops. Australian family physician. 2010;39(6):433-7. PubMed PMID: 20628685
  8. Borrás S, Martínez-Solís I, Ríos JL. Medicinal Plants for Insomnia Related to Anxiety: An Updated Review. Planta medica. 2021;87(10-11):738-753. PubMed PMID: 34116572
  9. Yeom JW, Cho CH. Herbal and Natural Supplements for Improving Sleep: A Literature Review. Psychiatry investigation. 2024;21(8):810-821. PubMed PMID: 39086164
  10. Unger M. [Botanical sedatives]. Pharmazie in unserer Zeit. 2007;36(3):206-12. PubMed PMID: 17555057

PubMed Topic Searches

  1. PubMed: Valerian and hops for insomnia

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Key Research: Stress, Anxiety and Mood

  1. Kyrou I, Christou A, Panagiotakos D, et al. Effects of a hops (Humulus lupulus L.) dry extract supplement on self-reported depression, anxiety and stress levels in apparently healthy young adults: a randomized, placebo-controlled, double-blind, crossover pilot study. Hormones (Athens, Greece). 2017;16(2):171-180. PubMed PMID: 28742505
  2. Kenda M, Kočevar Glavač N, Nagy M, et al. Medicinal Plants Used for Anxiety, Depression, or Stress Treatment: An Update. Molecules (Basel, Switzerland). 2022;27(18). PubMed PMID: 36144755

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Key Research: 8-Prenylnaringenin and Hormones

  1. Štulíková K, Karabín M, Nešpor J, et al. Therapeutic Perspectives of 8-Prenylnaringenin, a Potent Phytoestrogen from Hops. Molecules (Basel, Switzerland). 2018;23(3). PubMed PMID: 29543713
  2. Depypere HT, Comhaire FH. Herbal preparations for the menopause: beyond isoflavones and black cohosh. Maturitas. 2014;77(2):191-4. PubMed PMID: 24314619
  3. Abdi F, Mobedi H, Roozbeh N. Hops for Menopausal Vasomotor Symptoms: Mechanisms of Action. Journal of menopausal medicine. 2016;22(2):62-4. PubMed PMID: 27617238
  4. Kenda M, Glavač NK, Nagy M, et al. Herbal Products Used in Menopause and for Gynecological Disorders. Molecules (Basel, Switzerland). 2021;26(24). PubMed PMID: 34946512
  5. Dietz BM, Hajirahimkhan A, Dunlap TL, et al. Botanicals and Their Bioactive Phytochemicals for Women's Health. Pharmacological reviews. 2016;68(4):1026-1073. PubMed PMID: 27677719
  6. Cos P, De Bruyne T, Apers S, et al. Phytoestrogens: recent developments. Planta medica. 2003;69(7):589-99. PubMed PMID: 12898412

PubMed Topic Searches

  1. PubMed: 8-Prenylnaringenin and menopause

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Key Research: Xanthohumol and Other Hop Compounds

  1. Stevens JF, Page JE. Xanthohumol and related prenylflavonoids from hops and beer: to your good health! Phytochemistry. 2004;65(10):1317-30. PubMed PMID: 15231405
  2. Legette L, Karnpracha C, Reed RL, et al. Human pharmacokinetics of xanthohumol, an antihyperglycemic flavonoid from hops. Molecular nutrition & food research. 2014;58(2):248-55. PubMed PMID: 24038952
  3. Neumann HF, Frank J, Venturelli S, et al. Bioavailability and Cardiometabolic Effects of Xanthohumol: Evidence from Animal and Human Studies. Molecular nutrition & food research. 2022;66(6):e2100831. PubMed PMID: 34967501
  4. Jung F, Staltner R, Tahir A, et al. Oral intake of xanthohumol attenuates lipoteichoic acid-induced inflammatory response in human PBMCs. European journal of nutrition. 2022;61(8):4155-4166. PubMed PMID: 35857130
  5. Girisa S, Saikia Q, Bordoloi D, et al. Xanthohumol from Hop: Hope for cancer prevention and treatment. IUBMB life. 2021;73(8):1016-1044. PubMed PMID: 34170599
  6. Kołodziejczak A, Dziedzic M, Algiert-Zielińska B, et al. A Novel Look at Mechanisms and Applications of Xanthohumol (XN) in Dermatology and Cosmetology. International journal of molecular sciences. 2024;25(22). PubMed PMID: 39596008
  7. Chen W, Becker T, Qian F, et al. Beer and beer compounds: physiological effects on skin health. Journal of the European Academy of Dermatology and Venereology : JEADV. 2014;28(2):142-50. PubMed PMID: 23802910
  8. Tomita J, Mochizuki S, Fujimoto S, et al. Acute improvement of endothelial functions after oral ingestion of isohumulones, bitter components of beer. Biochemical and biophysical research communications. 2017;484(4):740-745. PubMed PMID: 28131837
  9. Gauruder-Burmester A, Heim S, Patz B, et al. Cucurbita pepo-Rhus aromatica-Humulus lupulus Combination Reduces Overactive Bladder Symptoms in Women - A Noninterventional Study. Planta medica. 2019;85(13):1044-1053. PubMed PMID: 31261419

PubMed Topic Searches

  1. PubMed: Xanthohumol human studies

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Key Research: Safety

  1. Duncan KL, Hare WR, Buck WB. Malignant hyperthermia-like reaction secondary to ingestion of hops in five dogs. Journal of the American Veterinary Medical Association. 1997;210(1):51-4. PubMed PMID: 8977648
  2. Pfaff A, Sobczak BR, Babyak JM, et al. Retrospective analysis of hops toxicosis in dogs (2002-2014): 71 cases. Journal of veterinary emergency and critical care (San Antonio, Tex. : 2001). 2022;32(1):90-97. PubMed PMID: 34498796
  3. Becker J, Brutlag AG, Hovda L, et al. A retrospective evaluation of hops ingestion in 177 dogs (2005-2018). Journal of veterinary emergency and critical care (San Antonio, Tex. : 2001). 2023;33(3):348-353. PubMed PMID: 36908194
  4. Bates N, Tizzard Z, Edwards N. Hops toxicosis in dogs. Journal of veterinary emergency and critical care (San Antonio, Tex. : 2001). 2022;32(2):274. PubMed PMID: 34850534
  5. Hops. Drugs and Lactation Database (LactMed) [Internet]. Bethesda (MD): National Institute of Child Health and Human Development; 2006–. PubMed PMID: 30000893
  6. Alkharfy KM, Frye RF. Effect of valerian, valerian/hops extracts, and valerenic acid on glucuronidation in vitro. Xenobiotica; the fate of foreign compounds in biological systems. 2007;37(2):113-23. PubMed PMID: 17484515

PubMed Topic Searches

  1. PubMed: Hops toxicosis in dogs

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External Resources

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Connections

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