The Best 5 Carb Blockers

LAST UPDATED: August 28, 2018 by Sasha deBeausset
Eat as many carbs as you want, without gaining weight. It sounds like something out of a dream, right? Not really. The best carb blocker is meant to keep your body from absorbing the calories from complex carbohydrates, helping you maintain your weight or even lose a few pounds. Not all carb blockers are the same, though, so it helps to know what to look for and what to expect from one.
Protein World Carb Blocker Capsules CARB STOPPER EXTREME Bodyfit Carb Ctrl She-Carb Block PureNature Carb Blocker

Best Carb Blocker Reviews

Protein World Carb Blocker Capsules contain white kidney bean extract as well as garcinia Cambodia. The white kidney bean extract is designed to prevent the complex carbs from being broken down the digestive tract.

Meanwhile, the Garcinia Cambodia supposedly regulates blood sugar levels, so that you want to eat less. It can also block the breakdown of carbohydrates and might have some fat-burning benefits.

The capsules are easy to swallow and dissolve quickly in the stomach.


  • Two capsules contain 890 mg white kidney bean extract, supposedly the most potent strength available.
  • The capsules also contain Garcinia Cambodia, which might have an added benefit for weight loss and blood sugar control
  • Pills are meant to be easy to swallow
  • Capsules are vegetarian, halal, gluten-free and soy-free.


  • Limited information is available about what is in the pills.
  • Product seems designed for use with other supplements.
  • Scant information is available concerning where the supplements are made.

CARB STOPPER EXTREME contains 1,000 mg of white kidney bean extract. The capsules are made in the USA and are certified GMP. They are also “100 percent natural,” although there’s no way to know what that means. The label states that the pills do not contain any stimulant and that they are suitable for vegetarians.

The only active ingredient in the tablets is the white bean extract. The product description claims that the supplement can help people lose up to 15 pounds per month, compared to diet on its own. But, there’s no hard evidence to back up that claim.


  • Vegetarian formula.
  • Contains 1,000 mg of white bean extract.
  • Product claims to help people lose a considerable amount of weight.


  • People who have used the supplement seem divided over how well it works. Some claim to have lost a fair amount of weight, while others claim it didn't help them at all.
  • The product makes a lot of grandiose or meaningless claims on its label.
  • Supplements aren't made in the UK and haven't been verified by an independent, 3rd party source.

Bodyfit Carb Ctrl contains 1,400 mg of white kidney bean extract per capsule. You’re meant to take three capsules per day, one before each meal, which is an awful lot of white bean extract. The supplement claims that the white bean extract will help boost your fibre intake and lower your cholesterol levels.

The supplement also contains ascorbic acid, vitamin B6, chromium and zinc. The ascorbic acid is a type of vitamin C. The chromium picolinate is meant to help regulate how your body metabolises carbs and to help normalise your blood sugar levels.

Bodyfit calls Carb Ctrl its most effective carb blocker and offers a 30-day money back guarantee if you’re not satisfied. The company claims that the supplement is made in the UK and that it is tested to ensure it contains what it claims to and that there are no harmful ingredients. The name of the testing lab isn’t provided.


  • High amount of white kidney bean extract helps block carbs.
  • Vegetarian-friendly formula.
  • Supplements are kosher and halal and free from gluten, soy and caffeine.
  • People who have used it note that it did help them lose weight quickly.


  • Due to the potency of the supplement, some people have noted toilet-related side effects.
  • You're meant to take three capsules a day, which can be a bit much for some people.

She-Carb Block is a carb blocker that’s marketed towards women, though there’s no reason why men couldn’t take it as well. The white kidney bean extract in the supplement inhibits the enzyme that normally breaks down carbs by up to 33 percent. The supplement also claims to reduce bloat and increase energy, thanks to the addition of caffeine.

Along with the bottle of supplements, purchase of She-Carb Block includes a free e-book “The Ultimate Female Fat Loss Blueprint,” which can help you reach your weight loss goals.

She-Carb Block is made in the UK and comes with a money back guarantee if you’re not happy with the results.


  • Includes a free weight-loss and fat burning guide.
  • Contains 1,250 mg of white kidney bean extract.
  • Contains vitamin C and chromium.
  • Some customers have noted significant weight loss.


  • Not suitable for vegetarians, the capsule contains gelatin.
  • Contains caffeine, which can be a problem if you're sensitive.
  • Marketed towards women, even though the formula doesn't offer benefits that would be particularly beneficial for women.

PureNature Carb Blocker contains 62.5 mg of kidney bean extract, caffeine, ascorbic acid and chromium. The supplement is non-GMO and claims to be organic. According to its description, the supplement alleges that in clinical studies, the average person lost 8.7 pounds and 3.3 inches from their waists.

The carb blocker is described as a phase 2 weight loss supplement, which apparently helps to reduce calorie consumption from carbs by up to 66 percent. The extract neutralises the enzymes that break down carbs so that they pass unabsorbed to your large intestine.

Unlike other carb blockers, PureNature’s supplement does contain caffeine. The claim is that the caffeine helps boost your metabolism and absorption. The supplement also contains chromium to help regulate your hunger hormones and to help reduce appetite.


  • Suitable for vegetarians.
  • Contains vitamin C and chromium


  • Contains caffeine, which can be an issue for those who need to avoid it or for people who are caffeine sensitive.
  • Contains less white kidney bean extract that other carb blockers.
  • People who have used it feel that it isn't particularly effective.

How to Choose a Carb Blocker

It's important to understand that there are two types of carb blocker, sometimes called a starch blocker, available. One type is available from your GP, by prescription. This kind of carb blocker is usually only given to people with diabetes and is meant to control blood sugar levels. An example of a carb blocker used to treat diabetes is acarbose, or Glucobay, according to The medicine slows down the breakdown of sugars so that a person's blood sugar doesn't rise quite so much after a meal. The other type of carb blocker is a supplement. It's available over-the-counter, at your chemist's or online. These carb blockers are intended for weight loss. They prevent a portion of the carbohydrates you eat from being absorbed by the body. When you don't absorb all of the carbs you eat, you don't absorb all of the calories, which can lead to weight loss in many people. Usually, the active ingredient in over-the-counter, weight loss carb blockers is Phaseolus vulgaris extract or white kidney bean. It's important not to confuse carb blockers, which are strictly supplements, with over-the-counter weight loss medications such as orlistat, sold under the brand name Alli. Orlistat works by keeping the fat you eat from being absorbed. According to the NHS, it blocks the absorption for about 1/3 of the fat you consume. You only pass the unabsorbed fat out of your body. Orlistat can prevent weight gain but isn't particularly effective for weight loss. It can also cause some unpleasant, toilet-related side effects.

What Are the Benefits of Carb Blockers?

Carb blockers work by preventing certain complex carbohydrates from being broken down by enzymes in the stomach and small intestine, according to Healthline. The complex carbs then move on to the large intestine without raising blood sugar or adding any calories to your body. The biggest supposed benefit of carb blockers is that they "allow" you to eat carbohydrates without consuming calories, thus allowing you to eat and avoid weight gain. But this is where things can get tricky. Most of the carbs that people eat aren't complex carbs, which need to be broken down. They are simple carbs, which aren't affected at all by carb blockers. Despite that, a few studies have shown that carb blockers do help people lose weight. One study found that individuals who used carb blockers lost nearly 9 pounds more than those in the control group. Usually, the more carbs people ate, the more likely they were to lose weight when taking carb blockers. Carb blockers might also provide some benefit by manipulating the hormones connected to feelings of fullness or hunger and by slowing down the rate at which your stomach empties after you eat. A study in rats found that phytohaemagglutinin, a compound that raises "fullness" hormones and that's often found in carb blockers, made the rats eat less. The rats that had the compound ate up to 90 percent less than rats who didn't receive the compound. But, the study revealed that the effects wore off as time went on and that once the rats stopped receiving the carb blockers, they ended up eating more than the rats who didn't take carb blockers, to begin with. Another benefit of carb blockers is that they convert more carbohydrates into resistant starches. Resistant starches get to the large intestine, where beneficial bacteria eat them, producing short chain fatty acids and gas. The more resistant starch a person consumes, the more likely he or she is to have lower levels of body fat, improved insulin sensitivity, better blood sugar control, and healthier gut bacteria.

Disadvantages of Carb Blockers

Carb blockers aren't without their side effects. While the supplements are usually considered safe to take, and the side effects aren't terrible, they can be pretty embarrassing. For one thing, carb blockers can make a person pretty gassy. Remember how the gut bacteria break down the resistant starches, producing gas? Where do you think that gas goes? Some of the more common side effects of carb blockers are bloating and flatulence. Another potential side effect is diarrhoea. It's also not uncommon for people to have cramping or an upset stomach after taking carb blockers. It's also worth noting that carb blockers won't replace making healthy food choices. Popping a carb blocker before a meal isn't an excuse to eat all the pasta and bread you see. While the supplements can provide some help with weight loss, sticking to an overall healthy diet is still the best way to drop pounds.

How to Take Carb Blockers

For best results, take carb blockers before you eat a meal that contains complex carbohydrates. If you're eating a low carb meal, there's no point in taking a carb blocker beforehand. The supplement won't be particularly effective if you wait until after a meal to take one.


For the greatest help with weight loss, it seems that Bodyfit Carb Ctrl is the way to go. The supplement is the most potent of the lot and seems to have helped plenty of people reach their weight loss goals. Additionally, Bodyfit Carb Ctrl is appropriate for a broad range of individuals and lifestyles. It's safe for people who need to avoid caffeine, suitable for those who keep kosher or halal, and suitable for vegetarians. Most importantly, the brand offers a money-back guarantee, so that you can try it out and return it without losing money.  

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