Hops: What It Is, Benefits, Dosage, and Sources

Hops, scientifically known as Humulus lupulus, are the cone-like flowers of the hop plant, a member of the Cannabaceae family, which also includes cannabis. While most commonly recognized for their role in brewing beer, hops have a history of medicinal use spanning centuries. These small, green strobiles contain various compounds, including bitter acids (alpha and beta acids), essential oils, and flavonoids, which contribute to their distinctive aroma, flavor, and preservative qualities, as well as their potential therapeutic effects. Understanding hops involves looking beyond the brew kettle to their botanical nature, historical applications, and the science behind their purported benefits.

What Are Hops? Everything You Need To Know

Hops are the female flowers of the hop plant, a vigorous climbing perennial vine that can grow up to 20 feet in a single season. The part of the plant used for brewing and medicinal purposes is the small, papery cone, often referred to as a strobile. Inside these cones are tiny, yellow glands called lupulin. This lupulin is the powerhouse of the hop, containing the resins and essential oils that impart bitterness, aroma, and flavor to beer, and are also responsible for many of the plant's medicinal properties.

The primary compounds of interest in hops include:

• Alpha Acids (Humulone, Cohumulone, Adhumulone): These contribute to the bitterness of beer and have been studied for their potential anti-inflammatory and sedative effects. They are isomerized during the brewing process, meaning their chemical structure changes with heat, to become more soluble and bitter.
• Beta Acids (Lupulone, Colupulone, Adlupulone): While also bitter, beta acids contribute less to the perceived bitterness of beer than alpha acids unless they oxidize. They also have potential antimicrobial properties.
• Essential Oils (Myrcene, Humulene, Caryophyllene, Farnesene): These volatile compounds are responsible for the diverse aromatic profiles of different hop varieties, ranging from floral and citrusy to piney and spicy. They are also being investigated for various health benefits.
• Flavonoids (Xanthohumol, Isoxanthohumol): These are antioxidants that have drawn significant attention for their potential chemopreventive properties. Xanthohumol, in particular, is unique to hops.

Hops are cultivated globally, with major growing regions including the Pacific Northwest in the United States, Germany, the Czech Republic, and the United Kingdom. Different varieties of hops are bred for specific characteristics, resulting in a wide array of flavors and bitterness levels.

Herbs in History: Hops

The use of hops dates back centuries, though their widespread adoption in brewing is a relatively more recent development. Early records suggest hops were cultivated in Europe as far back as the 8th century. Initially, hops were not the sole bittering agent in fermented beverages. Before their dominance, brewers used a mixture of herbs and spices known as "gruit" to balance the sweetness of malt and to preserve their brews.

The transition to hops in brewing gained significant momentum in the Middle Ages. By the 13th and 14th centuries, hops were being widely used in German breweries, particularly in Bavaria, where purity laws eventually mandated their inclusion. Their antiseptic properties were quickly recognized as beneficial for extending the shelf life of beer, making long-distance trade more feasible. Beyond brewing, hops also found a place in traditional medicine. European herbalists used hops for their sedative and anti-anxiety properties, often recommending them for insomnia, nervousness, and digestive issues. The folk wisdom of placing hop-filled pillows under the head to induce sleep persisted for generations.

The historical trajectory of hops underscores a dual appreciation for their functional benefits in preservation and their therapeutic potential, laying the groundwork for modern scientific inquiry.

What are hops? Learn about the hop plant and its role in beer

The hop plant, Humulus lupulus, is a dioecious plant, meaning individual plants are either male or female. Only the female plants produce the desired cone-like flowers, or strobiles, which are used in brewing and for medicinal purposes. Male plants are generally avoided in commercial hop cultivation because their pollination of female plants leads to seed production, which can impart undesirable flavors and aromas to beer and reduce the quality of the cones.

In brewing, hops serve several critical functions:

1. Bitterness: The alpha acids in hops are isomerized during the boil, creating compounds that provide the characteristic bitterness that balances the sweetness of malt. This bitterness is a cornerstone of beer flavor.
2. Aroma and Flavor: The essential oils in hops contribute a vast spectrum of aromas and flavors to beer, ranging from earthy and herbal to fruity, floral, and resinous. The timing of hop additions during brewing significantly impacts whether bitterness or aroma/flavor predominates. Hops added early in the boil contribute more bitterness, while those added later (known as "late hopping" or "dry hopping") preserve delicate volatile oils, enhancing aroma.
3. Preservation: Hops possess natural antimicrobial properties, helping to inhibit the growth of spoilage bacteria in beer. This was a crucial factor in their adoption over gruit.
4. Head Retention: Some compounds in hops can positively influence the stability and retention of a beer's foamy head.

The role of hops in beer is not static; it has evolved with brewing techniques and consumer preferences. Modern craft brewing, in particular, has pushed the boundaries of hop usage, exploring new varieties and methods to create highly aromatic and intensely flavored beers.

Hops - Crops and Soils - University of Wisconsin–Madison

Cultivating hops is an agricultural endeavor that requires specific environmental conditions and careful management. The University of Wisconsin–Madison, among other agricultural institutions, conducts extensive research on hop cultivation, focusing on optimizing yields, managing pests and diseases, and developing new varieties.

Key aspects of hop cultivation include:

• Climate: Hops thrive in temperate climates with long daylight hours during the growing season, ample rainfall, and well-drained soils. They require a period of winter dormancy.
• Soil: Deep, fertile, well-drained loam soils are ideal. Good drainage is crucial to prevent root rot.
• Trellising: As climbing vines, hop plants require tall trellises (often 18-20 feet high) to support their growth. The bines (the stems of the hop plant) are trained to climb these structures.
• Harvesting: Hops are typically harvested in late summer or early autumn when the cones are mature and their lupulin glands are fully developed. Mechanical harvesters are commonly used in commercial operations.
• Drying and Processing: After harvest, hop cones must be carefully dried to prevent spoilage and preserve their delicate compounds. They are then often pressed into pellets or processed into extracts for easier storage and use.

The agricultural science behind hops ensures the quality and consistency of the raw material, which is vital for both brewers and those interested in their medicinal applications. Research often focuses on sustainable practices, disease resistance, and enhancing the desirable chemical profiles of different hop varieties.

Beer Fundamentals - What are hops?

From a brewing perspective, hops are one of the four fundamental ingredients in beer, alongside water, malt, and yeast. Their inclusion is what largely defines the character of many beer styles. Without hops, beer would be a sweet, malty beverage, lacking balance and preservative qualities.

The selection of hop varieties is a critical decision for brewers, as each variety brings a unique set of characteristics. Hops are broadly categorized into:

• Bittering Hops: High in alpha acids, these are added early in the boil to impart a clean, firm bitterness. Examples include Magnum, Chinook, and Galena.
• Aroma Hops: Lower in alpha acids, but rich in essential oils, these are added late in the boil or during fermentation (dry hopping) to contribute delicate aromas and flavors. Examples include Cascade, Fuggle, and Saaz.
• Dual-Purpose Hops: These varieties offer a good balance of both alpha acids and desirable essential oils, making them versatile for both bittering and aroma. Examples include Centennial, Simcoe, and Citra.

The art of brewing often lies in the skillful combination and timing of hop additions to achieve a desired balance and complexity in the final product. The choice of hops can transform a beer from a crisp, refreshing lager to a juicy, aromatic India Pale Ale (IPA).

Hops Benefits

Beyond their culinary role, hops have been traditionally used and are increasingly studied for their potential health benefits, primarily attributed to their sedative, anti-inflammatory, and antioxidant compounds.

Sedative and Sleep Aid

Perhaps the most well-known traditional use of hops is as a mild sedative. The compounds in hops, particularly those in the essential oils and bitter acids, are believed to interact with neurotransmitters in the brain, including gamma-aminobutyric acid (GABA), which helps calm the nervous system.

• Mechanism: Hops extracts may increase GABA activity, leading to a calming effect. They are often combined with valerian root in herbal sleep preparations.
• Research: Studies, primarily on animal models and some human trials, suggest hops can reduce sleep latency (the time it takes to fall asleep) and improve sleep quality, particularly in individuals with mild sleep disturbances.

Anti-inflammatory Properties

Hops contain compounds like xanthohumol and various bitter acids that exhibit anti-inflammatory effects.

• Mechanism: These compounds may inhibit inflammatory pathways in the body, similar to how some non-steroidal anti-inflammatory drugs (NSAIDs) work, but through different mechanisms.
• Research: In vitro and animal studies have shown that hop compounds can reduce markers of inflammation. This area of research is ongoing, with potential implications for conditions involving chronic inflammation.

Antioxidant Effects

The flavonoids, especially xanthohumol, found in hops are potent antioxidants.

• Mechanism: Antioxidants help protect cells from damage caused by free radicals, unstable molecules that contribute to aging and various diseases.
• Research: Xanthohumol has been extensively studied for its antioxidant capacity and its potential role in disease prevention, particularly certain types of cancer.

Menopausal Symptoms

Hops contain phytoestrogens, plant compounds that can mimic the effects of estrogen in the body.

• Mechanism: One specific phytoestrogen in hops, 8-prenylnaringenin (8-PN), is considered one of the most potent naturally occurring phytoestrogens. It may help alleviate symptoms associated with estrogen decline during menopause, such as hot flashes and night sweats.
• Research: Several human trials have investigated hop extracts for menopausal symptom relief, with some showing promising results for reducing hot flashes and improving other discomforts.

Digestive Health

Traditionally, hops have been used to support digestion.

• Mechanism: The bitter compounds in hops may stimulate the production of digestive enzymes and bile, aiding in the breakdown of food and promoting healthy gut function.
• Research: While anecdotal evidence and traditional use are strong, modern scientific research specifically on hops' direct impact on human digestive health is less extensive compared to its sedative effects.

Hops Dosage

Determining an exact dosage for hops can be challenging due to variations in product concentration, individual sensitivity, and the specific condition being addressed. There are no standardized dosages established by regulatory bodies for general health uses.

For sleep and anxiety, typical dosages in studies and commercial supplements often range:

• Extracts: 100-500 mg, taken 30-60 minutes before bedtime, often in combination with valerian.
• Teas: Infusions made from 0.5-1 gram of dried hop cones.

For menopausal symptoms, specific hop extracts standardized for 8-prenylnaringenin content are often used, with dosages varying based on the concentration of this active compound. Studies have used doses ranging from 80-100 mg of a hop extract containing specific amounts of 8-PN daily.

It is always advisable to:

• Start with the lowest effective dose.
• Follow product-specific instructions on supplement labels.
• Consult a healthcare professional before starting any new supplement, especially if you have existing health conditions or are taking other medications.

Hops Side Effects

While generally considered safe for most people when consumed in moderation (e.g., in beer) or in appropriate supplemental doses, hops can cause side effects in some individuals.

Common or mild side effects may include:

• Drowsiness: This is the intended effect for sleep, but it can be a side effect if taken during the day or if too high a dose is consumed.
• Dizziness: Related to the sedative properties.
• Allergic Reactions: Individuals sensitive to plants in the Cannabaceae family may experience allergic reactions, such as skin irritation (dermatitis) from handling fresh hops, or rarely, respiratory symptoms.

More serious considerations:

• Depressant Interaction: Hops can enhance the effects of other central nervous system depressants, including alcohol, sedatives, antidepressants, and anti-anxiety medications. Combining hops with these substances can lead to excessive drowsiness or sedation.
• Hormone-Sensitive Conditions: Due to their phytoestrogen content, hops might theoretically interact with hormone-sensitive conditions like breast cancer, ovarian cancer, uterine cancer, endometriosis, or uterine fibroids. Individuals with these conditions should avoid hops supplements or consult their doctor.
• Surgery: Hops may cause increased drowsiness when combined with anesthesia and other medications used during and after surgery. It's generally recommended to stop using hops at least two weeks before a scheduled surgery.
• Depression: While hops can have a calming effect, some sources suggest that in very sensitive individuals or at high doses, they might exacerbate symptoms of depression due to their sedative nature.

Hops Natural Sources

The primary natural source of hops is the female flower of the Humulus lupulus plant. These flowers can be utilized in several forms:

• Fresh Hop Cones: Directly harvested from the plant, rarely used outside of very specific craft brewing applications or fresh hop teas, due to their perishable nature.
• Dried Hop Cones (Whole Leaf Hops): The most traditional form for brewing and herbal preparations. The cones are dried and can be used to make teas, tinctures, or added to pillows.
• Hop Pellets: Dried hops that have been milled and compressed into small pellets. This is the most common form for commercial brewing due to ease of storage, handling, and consistency.
• Hop Extracts: Concentrated forms of hop compounds, often used in brewing for bittering or aroma, and also found in some dietary supplements. These are typically processed to isolate specific compounds like alpha acids, essential oils, or xanthohumol.

Beyond direct plant material, hops are most commonly consumed in:

• Beer: The most widespread source, though the specific compounds and their concentrations can vary greatly depending on the beer style and brewing process.
• Herbal Teas: Dried hop cones are steeped in hot water to create a calming beverage.
• Dietary Supplements: Available in capsule, tablet, or liquid extract forms, often standardized to contain a certain amount of active compounds, sometimes combined with other herbs like valerian or chamomile.

Conclusion

Hops, the flowering cones of Humulus lupulus, are far more than just a key ingredient in beer. Their rich history in both brewing and traditional medicine highlights a diverse array of chemical compounds responsible for their distinctive characteristics and potential health benefits. From providing bitterness and aroma to beer, to acting as a mild sedative, anti-inflammatory, and antioxidant, hops offer a complex profile. While promising, particularly for sleep disturbances and menopausal symptoms, it's important to approach hop supplementation with awareness of potential side effects and interactions, especially given their sedative and phytoestrogenic properties. As with any herbal remedy, consulting with a healthcare professional before use is a prudent step to ensure safety and appropriateness for individual health needs.