GLP-1 Bitter Complex: How Hops and Feverfew Support Your Body's Natural Satiety Signals

GLP-1 is one of the most talked-about hormones in health right now. Most of that conversation centers on prescription medications, but your body makes its own GLP-1 every time you eat. A newer line of research looks at a much older idea: that bitter-tasting herbs can help the gut release its own satiety hormones.

GLP-1 Bitter Complex from MediHerb, the herbal line of Standard Process, is built on that idea. This guide covers what it is, how it works, what the research shows (and what it doesn't), how to take it, and who should avoid it. Every claim is cited.

What Is GLP-1 Bitter Complex?

GLP-1 Bitter Complex (product code M1725) is a 90-softgel herbal supplement from MediHerb. Its purpose is to support healthy satiety signals and digestive function.* Each softgel contains two standardized bitter herb extracts:¹

• Hops flower 4.5:1 extract, 218.2 mg (from 981.8 mg of Humulus lupulus flower). Each softgel provides 89.4 mg of total alpha acids and 48 mg of total beta acids.
• Feverfew herb 5:1 extract, 133.3 mg (from 666.7 mg of Tanacetum parthenium). Each softgel provides 2 mg of parthenolide.

At the full dose of three softgels a day, that adds up to about 268 mg of alpha acids and 144 mg of beta acids from a CO₂ Hops extract, plus 6 mg of parthenolide.¹

Other ingredients: rice bran oil, gelatin, glycerol, lecithin (soy), maltodextrin (tapioca), white beeswax and natural color. Contains soy. Because the softgel contains gelatin and beeswax, it is not vegan.¹

Standardization is what sets this formula apart. MediHerb tests for the specific bitter compounds the research focuses on, so each serving delivers a consistent amount of them.¹

What Are GLP-1, CCK and PYY?

Your intestines release several hormones in response to food. Three of them do much of the work of telling you that you've had enough to eat:^1,4

• GLP-1 (glucagon-like peptide-1) is made mainly by L-cells in the lower small intestine and colon. It supports satiety, slows how quickly the stomach empties, and plays a role in healthy insulin release and glucose metabolism.¹²
• CCK (cholecystokinin) signals fullness during a meal, slows stomach emptying, and supports the release of bile and digestive enzymes.
• PYY (peptide YY) helps reduce appetite after meals and slows gastric emptying.

Together, these hormones help regulate digestion and create the feeling of being satisfied after a meal. Diet quality, the gut microbiome, sleep and stress all affect how well this system works.^1,12

How Does GLP-1 Bitter Complex Work?

We don't only taste bitterness on the tongue. Humans have about 25 functional bitter taste receptors (TAS2Rs), and many of them are also found throughout the digestive tract, including on the hormone-producing (enteroendocrine) cells of the gut lining.^4,11 When bitter compounds reach those receptors, the cells can respond by releasing GLP-1, CCK and PYY.⁴ A 2021 review in the European Journal of Nutrition described bitter compounds as among the most potent tastants for influencing eating behavior.³

Both herbs in this formula supply those bitter compounds:

• Hops alpha acids (humulone, cohumulone, adhumulone) activate human TAS2R1 and TAS2R40 in laboratory studies. Beta acids (lupulone, colupulone, adlupulone) activate TAS2R1, and some also activate TAS2R14 and TAS2R40.⁸ In gut-cell studies, Hops extract and its alpha and beta acids stimulated GLP-1 and CCK secretion.¹⁰
• Parthenolide from Feverfew activates several human bitter receptors in laboratory testing, including TAS2R1, TAS2R4, TAS2R8, TAS2R10, TAS2R14, TAS2R44 and TAS2R46.⁹ A 2026 cell study found it promoted GLP-1 secretion by activating TAS2R4.¹³

This builds on a long tradition. Western herbalists have used bitter "tonic" herbs such as Hops and Feverfew for centuries to stimulate digestive juices and bile and to ease occasional indigestion and gas.^1,14 Modern research is now looking at the hormone pathways behind that traditional use.

What Does the Research Show?

The most relevant human studies used a supercritical CO₂ Hops extract containing about 51.5% alpha acids and 28.3% beta acids.⁴ At the 500 mg dose used in the gut-hormone trial, that works out to about 258 mg of alpha acids and 142 mg of beta acids. That is very close to the 268 mg and 144 mg daily amounts in three softgels of GLP-1 Bitter Complex.^1,5

Hops and satiety hormones (2022)

In a randomized, double-blind, placebo-controlled crossover trial in the American Journal of Clinical Nutrition, 19 healthy-weight men took 500 mg of Hops extract before lunch. Compared with placebo, the Hops extract:⁵

• Significantly increased total GLP-1, CCK and PYY levels over the 4.5-hour test period
• Reduced total energy intake from lunch and an afternoon snack by about 17%

Participants did not report feeling less hungry. The researchers suggested the extract may have encouraged earlier fullness during eating, rather than suppressing appetite beforehand.⁵

Hops, hunger and food cravings (2019 and 2024)

Two smaller randomized, double-blind crossover studies tested the same type of extract during a 24-hour water-only fast. Healthy men taking Hops extract reported significantly less hunger than with placebo (a reduction greater than 10%), and the usual midday rise in hunger was absent.⁶ In 30 healthy women, Hops extract reduced appetite and food cravings, and the higher dose led to 14.3% lower energy intake at the meal that ended the fast.⁷

Not every study was positive

A 2023 study tested lower doses (100 mg and 250 mg) delivered by catheter. It found only a modest, short-lived effect on PYY and no effect on CCK, appetite or food intake.¹⁵ This suggests that dose and timing matter, which is one reason GLP-1 Bitter Complex is standardized to the higher alpha- and beta-acid levels used in the positive trials.

Feverfew

Evidence for Feverfew's role in GLP-1 secretion comes from laboratory (cell) studies only.^9,13 No human trials have yet tested Feverfew alone or the combined GLP-1 Bitter Complex formula for satiety.

The bottom line: The human research is promising, but it is early. The studies were small and short-term, involved healthy adults, and used a single Hops ingredient rather than this exact formula. MediHerb describes the evidence as "a growing body of preliminary clinical research."¹

GLP-1 Bitter Complex vs. GLP-1 Medications

This is the question we hear most often. GLP-1 Bitter Complex is not a GLP-1 receptor agonist and is not a substitute for prescription medications such as semaglutide or tirzepatide. Here is how they differ:

If you currently take, are starting, or are stopping a GLP-1 medication, talk with your prescriber before adding any supplement. Never change a prescribed medication on your own. If you are on a GLP-1 medication and eating less, our article on drug-induced nutrient deficiencies explains which nutrients to keep an eye on.

How to Take GLP-1 Bitter Complex

The label dose is 1 softgel 3 times daily before meals, or as directed by your healthcare practitioner.¹ Bitter herbs send a strong signal to the digestive system, so MediHerb recommends building up to the full dose gradually. Move up one step every 3 to 7 days:²

1. Week 1: 1 softgel a day, before your main meal.
2. Week 2: 2 softgels a day, 1 before each of your two main meals.
3. Week 3 onward: 3 softgels a day, 1 before each main meal.

Timing matters. Take each softgel 30–60 minutes before eating. This gives the bitter compounds time to reach the small intestine, so they are in place to support your natural satiety signals as you eat.²

If your stomach feels unsettled: stay at your current dose instead of moving up, or step back to the last dose that felt comfortable. You can also take the softgel with your meal at first, then gradually move it to about 15 minutes before. Once you feel settled, build up again more slowly.²

Is GLP-1 Bitter Complex Safe? Side Effects and Who Should Avoid It

Possible side effects

Some people notice digestive changes when they first start. Less commonly, nausea, stomach discomfort, bloating or loose stools can occur.^2,5,6 These effects are usually linked to the dose, which is why the gradual build-up matters. Feverfew has also been associated with mild digestive upset and, less often, allergic skin reactions.¹⁶ Learn more about feverfew from the NIH National Center for Complementary and Integrative Health.

Do not use if you:

• Are pregnant or breastfeeding
• Have a known allergy to plants in the daisy family (Asteraceae/Compositae), such as ragweed, chamomile, chrysanthemums or marigolds
• Are under 18 years of age

Talk to your practitioner first if you:

• Have a past or present estrogen-sensitive condition (for example, of the breast, uterus, cervix or prostate). Hops has shown estrogenic activity.^1,17
• Take hormone replacement therapy
• Take any prescription medication, including GLP-1 or blood sugar medications
• Have a soy allergy (the softgel contains soy lecithin)

MediHerb also publishes a Potential Herb-Drug Interactions Chart that you can review with your healthcare provider.

How to Get the Most From GLP-1 Bitter Complex

GLP-1 Bitter Complex is designed to complement a healthy diet and lifestyle, not replace one. MediHerb and Standard Process recommend these habits, which also support healthy GLP-1 function on their own:^2,12

• Include protein with meals. High-protein meals increase GLP-1 more than meals highest in carbohydrates or fat. Good choices include fish, chicken, eggs, dairy, legumes, nuts and seeds. Plant-based protein powders can help on busy days.
• Get 25–30 g of fiber a day. Soluble fiber from oats, barley, beans, fruits and vegetables feeds the gut bacteria that produce short-chain fatty acids, another trigger for GLP-1 release. Browse our fiber supplements.
• Eat omega-3-rich foods. The omega-3 fatty acids EPA and DHA from salmon, tuna and other fish can help modulate GLP-1 release from intestinal cells.
• Add bitter foods. Arugula, broccoli and other Brassica vegetables, ginger and citrus all add bitter compounds to your diet.
• Stay hydrated. Aim for about 8 cups (64 fl oz) of fluids a day, and more in hot weather or when you're active.
• Prioritize sleep and manage stress. Aim for 7–9 hours a night on a consistent schedule. A healthy circadian rhythm supports GLP-1 secretion, and stress can quickly lower it.
• Stay active. Aim for around 30 minutes of moderate activity most days, with regular strength or resistance exercise.

For more on keeping your digestive system working well, read Digestion Problems? Common Causes & Prevention.

Products That Pair Well With GLP-1 Bitter Complex

In Standard Process's clinical protocol for supporting healthy GLP-1 function, and in MediHerb's practitioner materials, GLP-1 Bitter Complex appears alongside these products.^1,12 Your practitioner can help you decide what fits your needs.

• Whole Food Fiber: soluble and insoluble fiber from whole foods to support regularity and beneficial gut bacteria.*
• Tuna Omega-3 Oil: helps fill the gap in dietary omega-3 intake. Shop more fish oil supplements.*
• Glucose Assist™: a low-glycemic, plant-protein shake that helps support healthy blood sugar levels already in a normal range. Also available in vanilla.*
• Gymnema: helps reduce occasional sweet cravings.*
• DiGest Forte: supports bile production and digestion.*
• Metabol Complex and Black Cumin Seed Forte: support healthy blood sugar and fat metabolism.*
• Berberine Active and Gut Flora Complex: support a healthy bowel environment.*

Explore more options in our Weight Management, Glucose Support and Digestive Support collections, or shop the full Standard Process and MediHerb line. To learn more about the company behind the formula, read Standard Process: A Legacy of Whole Food Nutrition.

Frequently Asked Questions About GLP-1 Bitter Complex

Does GLP-1 Bitter Complex contain GLP-1?

No. GLP-1 is a hormone your own intestine makes. GLP-1 Bitter Complex contains standardized Hops and Feverfew extracts. Their bitter compounds activate bitter taste receptors in the gut, which helps support your body's natural release of GLP-1, CCK and PYY.*¹

Is GLP-1 Bitter Complex a natural alternative to Ozempic or other GLP-1 drugs?

No. It is a dietary supplement, not a drug, and it is not a replacement for any prescription GLP-1 medication. Prescription GLP-1 drugs mimic the hormone and activate its receptor directly. GLP-1 Bitter Complex works upstream by supporting the body's own satiety signaling.* If you take a prescription medication, talk to your prescriber before adding a supplement.

Will GLP-1 Bitter Complex help me lose weight?

GLP-1 Bitter Complex is designed to support healthy satiety, appetite regulation and digestion as part of a healthy diet and lifestyle.* In short-term studies, a similar Hops extract reduced how much healthy adults ate at a meal compared with placebo.^5,7 However, no long-term studies have tested this formula's effect on body weight. Results depend on your overall diet, activity, sleep and other habits.

How long does it take for GLP-1 Bitter Complex to work?

In clinical studies, a single dose of Hops extract affected gut hormones and hunger within about 1.5 to 2 hours.^5,6 In practice, plan on about three weeks to reach the full dose, since MediHerb recommends building up gradually. Consistent daily use before meals is what the formula is designed for.²

When is the best time to take GLP-1 Bitter Complex?

Take it 30–60 minutes before a meal, up to three times a day. This gives the bitter compounds time to reach the small intestine before you start eating.²

What happens if I miss a dose?

Simply take your next dose as usual. Don't double up.²

What are the side effects of GLP-1 Bitter Complex?

The most common effects are digestive: nausea, stomach discomfort, bloating or loose stools, usually when first starting or increasing the dose too quickly.² If this happens, stay at or step back to a comfortable dose, or take the softgel with food until you adjust. Contact your healthcare practitioner if symptoms are severe or don't settle.

Can I take GLP-1 Bitter Complex with a GLP-1 medication like semaglutide or tirzepatide?

GLP-1 Bitter Complex has not been studied alongside prescription GLP-1 medications. Because both affect appetite and digestion, check with your prescriber before combining them.

Who should not take GLP-1 Bitter Complex?

Do not take it if you are pregnant, breastfeeding, under 18, or allergic to plants in the daisy family. Use caution and talk to your practitioner first if you have a past or present estrogen-sensitive condition or take hormone replacement therapy.¹

Why does it contain Hops? Will it make me sleepy?

Hops is the bitter flower used in brewing beer. It also has a long history in herbal medicine as a bitter digestive tonic and a calming herb.⁴ GLP-1 Bitter Complex uses a CO₂ extract standardized for the bitter alpha and beta acids that the satiety research focuses on.¹ MediHerb doesn't list drowsiness as an expected effect, but notice how you feel when you start, and talk to your practitioner if you have concerns.

Is GLP-1 Bitter Complex vegan or soy-free?

No. The softgel contains gelatin and beeswax, so it is not vegan, and it contains soy lecithin.¹ It is formulated without milk or milk-derived ingredients.

How long should I take GLP-1 Bitter Complex?

Take it for as long as your healthcare professional recommends. Once you've adjusted to it, MediHerb suggests staying at 3 softgels daily for best results.²

How many servings are in a bottle?

Each bottle contains 90 softgels. At the full dose of 3 softgels a day, one bottle lasts about 30 days.¹

The Bottom Line

GLP-1 Bitter Complex brings together a centuries-old herbal tradition and a growing body of research on bitter taste receptors in the gut. Its standardized Hops and Feverfew extracts are designed to support your body's own GLP-1, CCK and PYY signaling, healthy satiety and digestion.* It works best as part of a balanced lifestyle that includes protein, fiber, sleep and movement. Start low, take it before meals, and work with your healthcare practitioner, especially if you take medications.

Shop GLP-1 Bitter Complex

References

1. MediHerb. GLP-1 Bitter Complex: Information for Professional Use (product literature L00751), including Supplement Facts and cautions. Standard Process Inc.; 2026.

2. MediHerb. GLP-1 Bitter Complex: Your Guide to Getting Started (patient guide LN07625). Standard Process Inc.; 2026.

3. Klaassen T, Keszthelyi D, Troost FJ, Bast A, Masclee AAM. Eur J Nutr. 2021;60(6):2923-2947. doi:10.1007/s00394-021-02485-4

4. MediHerb. Phytotherapist's Perspective: Herbs to Support Secretion of GLP-1 and Reduce Appetite. May 2026.

5. Walker EG, Lo KR, Pahl MC, et al. An extract of hops (Humulus lupulus L.) modulates gut peptide hormone secretion and reduces energy intake in healthy-weight men: a randomized, crossover clinical trial. Am J Clin Nutr. 2022;115(3):925-940.

6. Walker E, Lo K, Tham S, et al. New Zealand bitter hops extract reduces hunger during a 24 h water only fast. Nutrients. 2019;11(11):2754.

7. Walker E, Lo K, Gopal P. Gastrointestinal delivery of bitter hop extract reduces appetite and food cravings in healthy adult women undergoing acute fasting. Obes Pillars. 2024;11:100117.

8. Intelmann D, Batram C, Kuhn C, et al. Three TAS2R bitter taste receptors mediate the psychophysical responses to bitter compounds of hops (Humulus lupulus L.) and beer. Chem Percept. 2009;2(3):118-132.

9. Meyerhof W, Batram C, Kuhn C, et al. The molecular receptive ranges of human TAS2R bitter taste receptors. Chem Senses. 2010;35(2):157-170.

10. Lela L, Ponticelli M, Carlucci V, et al. Insight into the interaction of Humulus lupulus L. specialized metabolites and gastrointestinal bitter taste receptors: in vitro study in STC-1 cells and molecular docking. J Nat Prod. 2024;87(8):2021-2033.

11. Descamps-Solà M, Vilalta A, Jalsevac F, et al. Bitter taste receptors along the gastrointestinal tract: comparison between humans and rodents. Front Nutr. 2023;10:1215889.

12. Standard Process. Clinical Protocol: Support for Healthy GLP-1 Function (LN05051). Standard Process Inc.; 2026. Includes references to van der Klaauw AA, et al. Obesity. 2013;21(8):1602-1607; Liu C, et al. Front Endocrinol. 2022;13:991397; and Wang Q, et al. Mol Metab. 2024;88:102002.

13. Li S, Chen Y, Song Z, et al. Parthenolide promotes glucagon-like peptide-1 secreting in human Caco-2 cells via regulation of bitter taste receptor-induced calcium signaling. Mol Cell Biochem. 2026;481(2):775-789.

14. Bone KM, Mills SY. Principles and Practice of Phytotherapy: Modern Herbal Medicine. 2nd ed. Elsevier; 2013.

15. Bitarafan V, Fitzgerald PCE, Poppitt SD, Ingram JR, Feinle-Bisset C. Effects of intraduodenal or intragastric administration of a bitter hop extract (Humulus lupulus L.) on upper gut motility, gut hormone secretion and energy intake in healthy-weight men. Appetite. 2023;184:106490.

16. European Medicines Agency, Committee on Herbal Medicinal Products. Assessment report on Tanacetum parthenium (L.) Schultz Bip., herba. EMA/HMPC/48716/2017; 2020.

17. Chadwick LR, Pauli GF, Farnsworth NR. The pharmacognosy of Humulus lupulus L. (hops) with an emphasis on estrogenic properties. Phytomedicine. 2006;13(1-2):119-131.

*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.

This article is for informational purposes only and is not intended as medical advice. Always consult your healthcare provider before starting a new supplement, especially if you are pregnant or nursing, take medication, or have a medical condition.