A bitter hop supplement helped people lose more fat while keeping their muscle during a 24-week weight loss program, according to Gram Research analysis of a new randomized controlled trial. The 150 participants taking 500 mg of bitter hop extract daily lost 3.8% more body weight and 3.9 kg more fat than those taking a placebo, while both groups preserved muscle mass. The supplement appears to work by triggering natural appetite-suppressing hormones, making it a potentially useful addition to diet and exercise programs.
A new study found that a supplement made from bitter hops may help people lose weight more effectively when combined with diet and exercise advice. Researchers gave 150 people either the hop extract or a placebo while they followed a 24-week weight loss program. The group taking the bitter hop supplement lost more fat and body weight than the placebo group, and importantly, they didn’t lose muscle mass. This suggests that natural supplements could be a helpful addition to traditional weight loss programs, though more research is still needed.
Key Statistics
A 2026 randomized controlled trial of 150 adults found that bitter hop extract supplementation resulted in 3.8% greater body weight loss and 3.9 kg greater fat mass loss compared to placebo over 24 weeks, while preserving muscle mass in both groups.
According to research reviewed by Gram, participants taking 500 mg of bitter hop extract daily achieved a total body weight reduction of 4.3% and fat mass loss of 4.5 kg from baseline after 24 weeks of combined supplement use and lifestyle advice.
A 2026 study published in Obesity Pillars showed that bitter hop extract reduced visceral fat (dangerous abdominal fat) proportionally similar to placebo, suggesting the supplement helps target harmful fat deposits specifically during weight loss programs.
The Quick Take
- What they studied: Whether a natural supplement made from bitter hops could help people lose weight better when combined with diet and exercise advice
- Who participated: 150 adults (both men and women) who were overweight or obese and wanted to lose weight. They all received monthly lifestyle advice and either took the hop supplement or a placebo pill for 24 weeks. 128 people completed the full study.
- Key finding: People taking the bitter hop extract lost about 3.8% more body weight and 3.9 kg more fat than those taking a placebo, while keeping their muscle mass intact
- What it means for you: If you’re trying to lose weight through diet and exercise, a bitter hop supplement might help you lose more fat specifically, rather than losing muscle along with fat. However, this is just one study, so talk to your doctor before starting any new supplement
The Research Details
This was a randomized controlled trial, which is one of the strongest types of scientific studies. Researchers randomly assigned 150 people to either take a 500 mg bitter hop extract supplement or a placebo (fake pill) that looked identical. Neither the participants nor the researchers knew who was getting the real supplement until the study ended—this is called being “double-blind” and helps prevent bias. Everyone participated in a 24-week weight loss program that included monthly group seminars with lifestyle advice. Participants took their assigned supplement twice daily, about an hour before their two main meals.
Every four weeks, researchers measured participants’ body weight, body composition (how much fat versus muscle they had), and asked about their appetite and food cravings. Body composition was measured using bioelectrical impedance analysis (BIA), a safe, non-invasive method that sends a tiny electrical signal through the body to estimate fat and muscle percentages.
The study was registered with the Australia and New Zealand Clinical Trial Registry, which means it was officially recorded before it started. This transparency helps ensure the research was conducted properly and results weren’t cherry-picked.
This study design matters because it’s specifically testing whether the bitter hop supplement works as an “add-on” to regular weight loss advice, not as a replacement. Many people struggle with traditional diet and exercise programs alone, so finding a natural supplement that could boost results would be valuable. The double-blind design is important because it prevents people from unconsciously eating differently if they think they’re taking something that helps with weight loss.
Strengths: This was a randomized controlled trial, the gold standard for testing whether something actually works. The study was double-blind, preventing bias. It measured actual body composition changes, not just weight. The sample size of 150 people is reasonably large. Limitations: 22 people dropped out before completing the study, which could affect results. The study only lasted 24 weeks, so we don’t know if benefits continue longer. We don’t know if results would be similar for different age groups or ethnic backgrounds. The study was conducted in Australia and New Zealand, so results might differ in other populations.
What the Results Show
After 24 weeks, the group taking the bitter hop extract lost significantly more weight than the placebo group. Specifically, the hop extract group lost 3.8% more body weight compared to placebo, and 4.3% total body weight compared to their starting weight. More importantly, they lost 3.9 kg more fat mass than the placebo group, and 4.5 kg total fat mass from baseline.
A key finding was that neither group lost muscle mass during the weight loss program. This is important because when people lose weight through diet and exercise alone, they often lose some muscle along with fat. The bitter hop supplement appeared to help people lose fat preferentially while preserving their muscle, which is the ideal outcome for weight loss.
The study also found that the bitter hop group had a proportionally similar reduction in visceral fat (the dangerous fat stored around internal organs) compared to the placebo group. This suggests the supplement helped with fat loss in the most harmful areas. All these differences were statistically significant, meaning they were unlikely to be due to chance.
The study measured appetite and food cravings subjectively (by asking participants how hungry they felt), though detailed results on these measures weren’t fully described in the abstract. The researchers believe the bitter hop extract works by stimulating the release of two natural appetite-suppressing hormones: GLP-1 and cholecystokinin (CCK). These hormones help people feel fuller longer and eat less. The fact that the supplement appeared to work alongside lifestyle advice suggests it could be a useful addition to traditional weight loss programs rather than a replacement for them.
Previous research had shown that bitter hop extracts can increase GLP-1 and CCK hormones in the digestive system. This study is the first to test whether this actually translates to better weight loss results in real people following a weight loss program. The findings align with what we know about how appetite-suppressing hormones work, but this is the first human trial demonstrating the supplement’s effectiveness as an adjunct therapy. The results are promising compared to many other supplement studies, which often show minimal effects.
The study lasted only 24 weeks, so we don’t know if the benefits continue beyond six months or if people regain weight after stopping the supplement. Twenty-two participants dropped out, which could skew results if those people had different outcomes. The study doesn’t explain exactly how much the appetite-suppressing effect contributed to weight loss versus other factors. We don’t know if the supplement works equally well for different ages, genders, or ethnic groups, though the study included both men and women. The study was conducted in Australia and New Zealand, so results might differ in other countries with different diets and lifestyles. Finally, 500 mg was the only dose tested, so we don’t know if higher or lower doses might work better.
The Bottom Line
If you’re overweight or obese and working with a doctor or nutritionist on a weight loss program, a bitter hop supplement might be worth discussing as a potential addition to your plan. The evidence suggests it could help you lose more fat while preserving muscle. However, this is based on one study, so confidence in this recommendation is moderate. The supplement should never replace diet and exercise advice—it appears to work best as an addition to lifestyle changes. Always consult your healthcare provider before starting any new supplement, especially if you take medications or have health conditions.
This research is most relevant for adults who are overweight or obese and are actively trying to lose weight through diet and exercise. It may be particularly interesting for people who have struggled to lose weight with lifestyle changes alone. People with certain digestive conditions, those taking medications that affect appetite, or pregnant or breastfeeding women should consult a doctor before trying this supplement. The study included both men and women, so it may apply to both, though more research in specific populations would be helpful.
In this study, participants took the supplement for 24 weeks (about 6 months) before seeing the full benefits. You might notice some appetite suppression within days or weeks, but significant fat loss typically takes several weeks to become noticeable. The study measured changes every four weeks, suggesting that’s a reasonable timeframe to assess whether the supplement is helping you personally. Don’t expect overnight results—sustainable weight loss usually happens gradually over months.
Frequently Asked Questions
Does bitter hop supplement really help you lose weight?
Research shows bitter hop extract helped people lose 3.8% more weight and 3.9 kg more fat than placebo over 24 weeks when combined with diet and exercise. However, this is one study, so more research is needed before making strong claims about effectiveness.
Can you lose fat without losing muscle with supplements?
This study found that people taking bitter hop extract lost fat while preserving muscle mass, unlike many traditional diets. The supplement appears to work by suppressing appetite, allowing people to eat less without losing muscle during weight loss.
How long does it take to see results from bitter hop extract?
In this study, participants took the supplement for 24 weeks to see the full results. Researchers measured changes every 4 weeks, suggesting you should expect to wait at least a month to notice meaningful fat loss when combined with diet and exercise.
Is bitter hop supplement safe to take with diet and exercise?
The study found no mention of serious side effects over 24 weeks, and 128 of 150 participants completed the program. However, always consult your doctor before starting any supplement, especially if you take medications or have health conditions.
What makes bitter hop extract different from other weight loss supplements?
Bitter hop extract works by triggering natural appetite-suppressing hormones (GLP-1 and CCK) in your digestive system, rather than using stimulants. This study is the first to show it actually helps people lose more fat when combined with lifestyle changes.
Want to Apply This Research?
- Track your daily supplement intake (did you take it before meals?) and measure body weight and waist circumference weekly. More importantly, track body composition changes every 4 weeks using a scale that measures body fat percentage, or get professional measurements done. This helps you see if you’re losing fat specifically, not just weight.
- Set a phone reminder to take your supplement about 1 hour before your two largest meals, as this is how it was used in the study. Log your meals and appetite levels before and after taking the supplement to see if you notice reduced hunger. This creates accountability and helps you understand if the supplement is actually affecting your appetite.
- Create a monthly check-in where you record: body weight, estimated body fat percentage, how your clothes fit, energy levels, and appetite changes. Compare these metrics month-to-month rather than day-to-day, since weight naturally fluctuates. If after 8-12 weeks you’re not seeing the expected fat loss while following diet and exercise advice, discuss with your doctor whether the supplement is right for you or if adjustments are needed.
This research describes the effects of bitter hop extract in a single 24-week study of 150 adults. Results may not apply to all populations, ages, or health conditions. Bitter hop supplements are not approved by the FDA as a treatment for obesity and should not replace medical advice or prescribed weight loss treatments. Consult your healthcare provider before starting any new supplement, especially if you are pregnant, breastfeeding, taking medications, or have existing health conditions. Individual results vary, and weight loss requires sustained diet and exercise changes. This article is for educational purposes and should not be considered medical advice.
This research translation is published by Gram Research, the science division of Gram, an AI-powered nutrition tracking app.