Konjac (capsules, etc.): my Opinion & Purchase at the Best Price

[Article updated on 19/09/2023]

Konjac (Amorphophallus konjac) is a perennial plant of the genus Amorphophallus that grows in tropical and subtropical regions of eastern Asia, from Indonesia to India, Japan and China. It is known primarily for its starchy corm, a tuber-like structure that is part of the stem of plants, but grows underground and acts as a storage organ for the plant. Konjac is also known as elephant yam, presumably for the resemblance of its corm to that of the true yam, but the two plants are not closely related.

Before reading on

I’m not an expert in this field, but I am passionate about nutrition and health.

The articles you’ll find on my site are the result of in-depth research that I’d like to share with you. However, I would like to stress that I am not a health professional and that my advice should in no way replace that of a qualified physician. I’m here to guide you, but it’s important that you consult a professional for specific questions or medical concerns. Your well-being is important. So be sure to consult the appropriate experts and take the best possible care of yourself.

Konjac is primarily used as a source of glucomannan, a dietary fiber that makes up about 40% of the plant corm. Glucomannan is used as a food additive for its thickening and emulsifying properties, and as a nutritional supplement for the treatment of obesity, constipation, high cholesterol, diabetes and acne. In the opinion of dietitians, it provides a rich source of soluble fiber of general benefit to the digestive system, while containing almost no calories.

Konjac price

History and origin

Konjac is regularly mentioned in Chinese history treatises, both as medicine and food. The first known use of this plant as a medicinal herb dates back to the Han Dynasty in China, around two thousand years ago. At that time it was recommended for the treatment of asthma, infection, cough and skin conditions. According to historians, its use continued through subsequent dynasties and has remained uninterrupted to the present day.

Corm, in the form of flour or jelly, has a long culinary history in China and Japan. In China’s Sichuan province, the jelly is used as a substitute for tofu and called konjac tofu. In Japan, where it is called konyaku, the flour is mixed with water and lime, then boiled. Once solidified, it is cut into several shapes. Cut into thin slices, this fiber can take the place of thinly sliced ​​tofu or raw fish. When cut into strips, it can take the place of noodles in many stew dishes. Konjac itself has little or no taste.

Western interest in this plant has increased over the past two decades as the health benefits of dietary fiber have become better understood. Research has focused on its potential for cholesterol and blood sugar control, as an aid in weight loss, and as an overall digestive health benefit. The results of these studies have been promising.

Natural Konjac
Natural Konjac

Culture and processing

Konjac is grown in China, India, Japan and Korea. The plant grows best in tropical or subtropical conditions characterized by moderate rainfall. In the opinion of agronomists, Konjac prefers a soil structure that combines a somewhat sandy top layer with a muddy bottom layer that can retain water. In Japan and China, it is often grown on hilly terrain that does not favor traditional agriculture, and each plant requires very little space. Plants are generally spaced further apart in their second and third years, when they reach peak levels of glucomannan content. They are then dug up to be cleaned and processed.

Traditional post-harvest processing is a very laborious operation. The bulbs are separated from the rest of the plant, washed and peeled by hand before being sliced ​​and dried in the sun. Modern processing incorporates machinery and speeds up the drying process with air heated by burning coal. Regardless of the process used, the goal is to produce a product dry enough to be stored and achieve higher concentrations of glucomannan. The extent to which konjac is processed depends on its intended use as a moderately priced food, food additive, or nutritional supplement.

Konjac flour is made by grinding the dry corms and separating the lighter components from the heavier flour. What’s left is about 70% glucomannan and can be used in noodles and other dishes. The flour can be processed to reach a glucomannan content of 80%, producing konjac jelly or gum which can be used as a thickener or gelling agent. It can be purified for use as a nutritional supplement.

Konjac, an essential ally for weight loss

In the opinion of nutritionists, the effectiveness of konjac for weight loss is based on its ability to absorb up to twenty times its own weight in water. Glucomannan expands after ingestion, which tends to promote a feeling of fullness as it passes through the digestive tract. To achieve this result, konjac is usually taken with water before meals. An alternative, less popular approach is to sprinkle glucomannan granules directly onto food.

Discounted foods such as shirataki noodles, rice and spaghetti have been created, which means fewer carbohydrates and therefore fewer calories. This is a great alternative for those who want to continue eating dishes that would typically be higher in carbs and calories. The herb can be used to help increase energy levels and boost metabolism. This is a great option for those looking to exercise more to lose weight.

Recommended doses for weight loss range from one to four grams of glucomannan taken with a glass of water one hour before each meal.


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An excellent fiber supplement

In the opinion of nutritionists, adults should consume at least 20 to 35 grams of fiber per day. The typical Western diet provides between 12 and 18 grams of fiber per day. Oat bran, with 14% soluble fiber, constitutes one of the most concentrated sources of soluble fiber known in the West. Glucomannan contains at least 40% fiber by dry weight, making konjac the richest source of soluble fiber in the world.

A remedy to relieve constipation

Digestive system

Clinical studies specific to glucomannan supplementation have shown positive results in treating a number of conditions, including constipation. Soluble fiber absorbs water, softens digestive contents and increases stool bulk, an opinion shared by all doctors. Constipation is a common problem, which is usually caused by a low-fiber diet, dehydration and lack of exercise. Several studies have shown that glucomannan may be helpful for constipation. When consumed, the powder acts as a prebiotic in the digestive system, which is very helpful in promoting healthy bowel movements.

Glucomannan is considered a natural laxative fiber, which means that its ingestion promotes the appearance of softer stools that pass more easily through the colon. According to experts, it also promotes defecation, as the patient exerts less effort to expel stools. A preliminary trial and a number of double-blind tests showed glucomannan to be an effective treatment for constipation. In constipated people, glucomannan and other bulk laxatives usually promote defecation within 12 to 24 hours of ingestion. Studies have shown that ingesting three to four grams is enough to relieve constipation.

Glucomannan is soluble in water and therefore facilitates digestion. It is able to help strengthen the digestive system, making it a great natural remedy for those with digestion issues. It can also help relieve hemorrhoids. Glucomannan can help the body absorb minerals, making the daily diet healthier. By aiding the absorption of minerals, all foods and drinks the patient ingests can be used more effectively.

A natural source of prebiotics

Probiotic foods are certainly essential for gut health and overall well-being. Prebiotics are what actually help nourish probiotics. Prebiotics like glucomannan, garlic, jicama, and artichokes pass through the upper gastrointestinal tract undigested because the human body cannot break them down. But once the prebiotics reach the colon, they are fermented by the intestinal microflora and create probiotics.

The root powder is a prebiotic that nourishes beneficial bacteria in the large intestine. A study published in 2008 demonstrated that glucomannan supplementation increased the fecal concentration of probiotics in general, as well as that of specific probiotics such as bifidobacteria and lactobacilli.

Higher intakes of prebiotics are linked to benefits like lower risk of cardiovascular disease and healthier cholesterol levels. They also promote better gut health, improved digestion and a better response to stress. Consumption of prebiotics is essential for better hormonal balance, more active immune function and a lower risk of obesity and weight gain.

A great cure for cholesterol

14 studies on glucomannan published in the American Journal of Clinical Nutrition found that the use of glucomannan had significant beneficial effects on total cholesterol, LDL cholesterol, triglycerides, body weight and fasting blood sugar. Being a fiber concentrate, this substance is able to reduce the absorption of cholesterol in the intestine by mopping up water in the digestive tract, thereby reducing the body’s absorption of cholesterol. By attaching to bile acids in the digestive system and moving them out of the body, glucomannan supplements can help lower cholesterol and reduce the amount of fat in the blood.


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Valuable help for diabetics

There are over 20 scientific studies involving glucomannan and diabetes. One way it can help diabetics is that it delays the natural emptying process of the stomach, leading to more gradual absorption of sugar and lower blood sugar levels after meals.

A study published in Diabetes Care showed that konjac fiber had very positive effects on diabetes. The study subjects, who were treated conventionally with a low-fat diet and drug therapy, were given biscuits enriched with konjac fiber. Overall, the researchers concluded that adding konjac fiber to conventional treatment can improve blood sugar control, blood lipid profile as well as systolic blood pressure in high-risk diabetic patients. They believe that the fiber from this plant can boost the effectiveness of conventional treatment for type 2 diabetes.

A powerful ally against hypertension

As a corollary to the beneficial effect of glucomannans on cholesterol levels, one study demonstrated a decrease in systolic blood pressure in healthy men after a four-week treatment with glucomannan supplements. There are many natural solutions to control blood pressure that are much better than taking certain pills. One of them is simply to add it to your daily diet.

The benefits of konjac
More fulfilled and well in their bodies

Konjac capsules: a host of health benefits

Soluble fiber has been extensively studied, which found that it produces short-chain fatty acids when digested. These acids, in turn, provide a number of health benefits, including decreasing cholesterol synthesis by the liver, regulating insulin release from the pancreas, and inhibiting the formation of polyps by the increase in the acidity level of the colon. According to researchers, fiber increases the production of a variety of cells and antibodies involved in the immune system. They also reduce the ability of irritating substances to adhere to the mucous layer of the colon.

Because the plant has antibacterial properties, it can help control minor oral health problems. The plant can help clean teeth and fight bacteria. The plant contains high amounts of anti-inflammatory agents, which may help with bone and joint health. This is particularly helpful for those who suffer from conditions such as arthritis.

People, who are looking for a product to clean their face from daily dirt and grime, will find valuable allies in konjac sponges. Konjac sponges can help clean the face. Thanks to their antibacterial properties, they can help fight oily skin and reduce acne. These sponges are natural and biodegradable. An interesting benefit of the plant is its ability to promote optical health. The herb can help combat eye problems, including eye inflammation. It can help strengthen the optic nerves and keep the eyes healthy.

In the opinion of health professionals, the fibers of the plant have shown good results when it comes to the treatment of hyperglycemia and hypoglycemia. Glucomannan draws water into the digestive system and turns into a gel that slows digestive processes and traps carbohydrates so that blood sugar levels are stabilized. If these effects interest you, I invite you to read my comparison of slimming capsules to analyze the different options available.

How to buy konjac?

Powder, capsules or tablets can be purchased at a local health food store or online. It is recommended to completely avoid capsule and tablet options, both of which have been linked to serious digestive obstructions. The tablets are known to swell before reaching the stomach.

When choosing powder or flour, you must ensure that they are 100% pure without additives or fillers. Organic versions are also a good idea but can be harder to find. Eating shirataki noodles or using glucomannan powder to make homemade noodles can be a great way to incorporate glucomannan into your diet. Japanese shirataki noodles are the most famous konjac food product.


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The recommended dose of glucomannan is lower than other fiber supplements because it expands greatly in water (up to 50 times its weight). One study showed that at doses of two to four grams per day, glucomannan was well tolerated and led to significant weight loss in obese or overweight individuals. For constipation, three to four grams of glucomannan has been shown to act as an effective laxative.

It is strongly recommended to start with a very small dose per day. For most powder products, the suggested dose is one teaspoon per day. This quantity should be dissolved in a large glass of water and swallowed 30 to 45 minutes before the meal. It is absolutely vital to take the powder with enough water to avoid the risk of choking.

Side effects

Glucomannan Plus, appetite suppressant with konjac

Glucomannan powder is considered safe when consumed as food. In medicinal amounts, the powder and capsules are probably safe for most healthy adults. Glucomannan, like other types of soluble fiber, can cause gastrointestinal problems when the amount consumed is suddenly increased. These may include bloating, stomach pain, loose stools, flatulence and diarrhea.

Soluble fiber absorbs water and forms a gel in the digestive tract, which slows the absorption of glucose into the blood and can lower blood sugar levels. People with diabetes should use caution when using glucomannan to avoid reducing their blood sugar levels too sharply.

Solid tablets containing glucomannan can be dangerous for the elderly and children due to the fact that they can sometimes cause blockages in the throat or intestines. The risk is particularly great for people who have structural abnormalities of the esophagus or intestine. The powder and capsules are not recommended for people who have difficulty with esophageal stricture or swallowing. Glucomannan should NEVER be taken without water. It is very possible to choke if you try to swallow it dry.

Another side effect of soluble fiber is that it is necessary to increase fluid intake to avoid dehydration or other complications. Anyone taking them should drink plenty of water and other fluids such as low-sodium vegetable juices. Glucomannan may reduce the absorption of oral medications, leading to decreased effectiveness. It is necessary for consumers to talk to their doctors about all medications they are taking before considering taking glucomannan weight loss supplements. Taking medications one hour before or four hours after taking a glucomannan-containing supplement helps avoid these interactions.

My opinion in detail

My overall rating: 3.6/5

In my reflection I take into account various elements to evaluate the product, in the case of a meal replacement, here are the criteria that I took into account for the overall effectiveness:

  • Composition: especially with regard to micronutrients and macronutrients, which play an essential role in weight loss and maintaining good health.
  • Brand awareness: This counts for the rating because it inspires trust and meets consumer expectations.
  • Feeling full also plays a crucial role in feeling energetic and avoiding premature cravings,
  • The price must be affordable to allow us to use the meal replacement regularly,
  • The dosage: it must be practical and without constraints, thus facilitating taking the daily dose.

The composition: 3.5/5

Glucomannan, extracted from konjac, is an excellent natural appetite suppressant. Choline regulates fats to facilitate weight loss. Vitamin B3 controls cholesterol and promotes the feeling of satiety. Chromium regulates glucose and fat storage. Vitamin D3 reduces fat storage and boosts serotonin to feel full. Hypromellose is used for pills and is suitable for people with dietary restrictions.
Overall, these ingredients show promise in helping with weight loss and appetite control! On the other hand, I who prioritize naturalness, this is not the case for Glucomannan

Notoriety: 4/5

WeightWorld is a brand dedicated to weight loss and slimming goals, it sells many slimming products and treatments. The site rather inspires confidence with all the TrustPilot certified reviews and all the partners with which it works. In addition, my orders have always arrived without problem.

On the other hand, today WeightWorld is not necessarily well known.

The price: 3.5/5

The price of the product is a small downside to this rating because the bottle is currently around €25 for 180 capsules. With a dose of 2 per meal, we are therefore at a treatment of 1 month, the stock therefore runs out quite quickly. This is why this rating was awarded, although the prices are decreasing by purchasing 2 or 3 bottles to have up to 20% reduction.

Opinions and precautions for use on taking Konjac capsules

The opinions of professionals

According to the US Food and Drug Administration (FDA), konjac candies have caused choking deaths in the elderly and children. This prompted the FDA to issue an import alert in 2011 for konjac candies. These candies have a gelatinous structure that does not dissolve in the mouth.

Konjac supplements may also increase in volume in the esophagus or intestine and cause an obstruction. The risk is higher if the patient takes konjac tablets and if it takes any form without water. This risk should be taken seriously if they are elderly people and if they have problems swallowing.

Several countries have banned the use of konjac due to the high incidence of intestinal or throat obstruction. Children and pregnant or breastfeeding women should not take konjac supplements. One should stop taking this supplement and consult a doctor if the patient experiences difficulty breathing, hives or rash, itching, tachycardia, and swelling of the face and tongue.

User opinions

Glucomannan Plus, a powerful appetite suppressant, has managed to attract many consumers due to its many benefits. In general, users of Glucomannan Plus testify to its effectiveness for weight loss and its ability to reduce appetite. The results are there, without the product being excessively expensive. Here are some testimonials from satisfied Glucomannan Plus users:


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  • Made in the E.U.
  • Preserves muscle mass
  • Suppresses feelings of hunger

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Konjac is a perennial plant used for its corm rich in glucomannan, a dietary fiber beneficial to health. It is widely used as a food additive and nutritional supplement, providing thickening, emulsifying and weight loss promoting properties.

Glucomannan has an interesting composition with beneficial ingredients for weight loss. The brand enjoys a good reputation and inspires trust. However, the price of the product can be considered a bit high. It is therefore important to take these aspects into account when deciding to use this meal replacement!

The alternatives

When looking for a meal replacement, it always helps to explore different options to find the one that best suits your needs. Although the Glucomannan I talked about previously may seem appealing, here are some alternatives that might also interest you, along with a detailed article: