Natrol Carb Intercept supplements contain an extract of Phaseolus vulgaris called phaseolamin. Carb blockers with phaseolamin may be helpful for weight loss, preventing blood glucose spikes and improving blood lipid levels.
According to Natrol, Carb Intercept contains “a clinically tested ingredient that may reduce the enzymatic digestion of dietary starches and help metabolize fats and proteins for energy.”
Many uses of the Carb Intercept diet pills report an appetite suppression effect which can support weight loss goals. These supplements are designed to enhance the fat loss results possible when following a sensible diet and exercising regularly.
Phaseolus vulgaris (also known as White Kidney Bean Extract) has been shown in research studies to inhibit the effects of the digestive enzyme Amylase. The active ingredient in Carb Intercept is Phase 2 Carb Controller Complex, which is a proprietary form of White Kidney Bean Extract combined with Chromium.



- Helps reduce the absoprtion of carbohydrates
- Suppresses the appetite & feel full
- May promote weight loss in a healthy diet
Natrol Carb Intercept 3 Ingredients
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Natrol Carb Intercept is a weight loss supplement formulated with a specific brand of phaseolamin, called Phase 2.
This is the proprietary white kidney bean extract that has been used in most of the clinical studies on carb blocking supplements. Results have been mixed, but some studies do show a positive effect on weight reduction and general health.
Phase 2 may reduce the enzymatic metabolism of foods high in starch content. Each recommended dose (2 capsules) of Natrol Carb Intercept 3 contains 750 mg of Phase 2 white kidney bean extract.
Other primary ingredients include:
- 270 mg Camellia sinensis leaf (green tea extract);
- 30 mcg chromium from foodbound chromium;
- 135 mg epigallocatechin gallate (EGCG);
- 75 mg caffeine;
- 15 mg sodium;
Other ingredients of Natrol carb intercept supplements include magnesium stearate, dicalcium phosphate, soy, yeast, gum arabic, gelatin, maltodextrin, silica and cellulose.
These products do not contain added sugar, artificial flavors, artificial colors, eggs, preservatives or milk. It is not recommended to exceed 4 capsules daily.
How does Natrol Carb Intercepts Work?
Carb-blocking pills like Carb Intercept are designed to interfere with the digestion of sugars found in starchy foods. By blocking some of these carbohydrates from being absorbed, it may be possible to reduce the effective Glycemic Index of certain foods.
Natrol’s Carb Intercept supplement contains Phase 2 phaseolamin. Phaseolamin extract is an inhibitor of alpha amylase isoform 1; an enzyme that aids in the metabolism of long-chain carbohydrates and fats.
Suppressing the activities of alpha amylase allows certain carbohydrates to pass through the intestinal tract without being digested.
Undigested carbohydrates can then either exit the body via excretion or be broken down and fermentated by colonic bacteria.
In either case, the result is no caloric gain from those carbohydrates. This is believed to parallel the weight loss and other benefits associated with restricting calories in the diet.
Note that Natrol Carb Intercept 3 or similar supplements should not be looked at as an independent, long-term solutions for enhancing fat metabolism, losing weight or maintaining healthy weight levels.
Long-term weight management requires a healthy diet, exercise and adequate hydration.
Additional Effects of Carb Intercept for Weight Loss
The other ingredients in Carb Intercept may also promote weight loss by controlling blood sugar levels and by increasing fat metabolism.
The foodbound chromium in these carbohydrate blockers helps to increase cellular permeability to glucose, allowing glucose from the blood to efficiently enter cells.
Glucose is used to create energy and fuel the many processes of metabolism. By enhancing glucose utilization, chromium helps to improve insulin sensitivity.
Many users report improvements to symptoms of type 2 diabetes and prediabetes (impaired glucose tolerance). Proper insulin regulation also decreases the long-term risks for developing cardiovascular disease.
The green tea extracts in Natrol carb blocker supplements can help to boost metabolism and modestly increase the rate at which your body burns calories.
EGCG demonstrates antioxidant potentials which may decrease cellular damage incurred from free radicals and other oxidizing agents. Caffeine is included to enhance alertness and provide a temporary energy boost.
Natrol Carb Intercept Supplements Results
What does the research say about the anti-obesity effects of Carb Intercept supplements with Phase 2 extract?
Obesity and overweightness rates are at all-time high levels. In the US, nearly 70% of those 20 years old and older are overweight to some degree, and about one third of US adults are considered obese.
Obesity is associated with almost every preventable disease. Being overweight and/or obese increases the risks for type 2 diabetes mellitus, cardiovascular disease, vascular disease, cancer, stroke, kidney disease and numerous other conditions.
Natrol Carb Intercept supplements with phaseolamin may help to combat obesity on a few different levels. As stated, by blocking the digestion of some carbohydrates and fats, they induce effects similar to caloric restriction.
Many users of carb intercepts report decreased appetites. They report feeling hungry less often, and being satiated with less food consumption. By better controlling appetite and eating less consistently, long-term obesity can be reduced.
Research shows that routine usage of a Phase 2-containing carb intercept can cause weight loss and reductions in waist circumference. Carrying body fat around the waist is associated with a higher rate of health problems.
In one 2-month study, treatment groups subjects lost an average of 1.9 kg (4.19 pounds) relative to a 0.4 kg (.89 pounds) average weight loss in placebo group subjects.
Concerning reductions in waist circumference, treatment group subjects experienced an average reduction of 1.9 cm (.75 inches) relative to an average 0.4 cm (.16 inches) reduction in controls. No changes in hip circumference were noted in either group.
Carb Intercept Side Effects
No major side effects are associated with Carb Intercept pills containing Phaseolus vulgaris extracts. Certain mild side effects are possible including nausea, vomiting, bloating, flatulence and/or diarrhea. These symptoms pass on their own within an hour or so in most cases.
Phaseolamin doses of 3 grams daily have been used for up to three months safely. Proper oral usage is rated as possibly safe. Do not mix carb intercepts with other substances that can lower blood sugar levels as this could result in hypoglycemia.
The manufacturers of Natrol Carb Intercept 3 supplements warn potential consumers of the caffeine content. They advise that exceeding the recommended daily dosage may cause jitteriness, rapid heart rate and/or insomnia.
Talk to your doctor about the potential benefits and side effects of Natrol Carb Intercept with Phase 2, or other carb blocker supplements which you may be considering.
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Article last updated on: March 12th, 2018 by Nootriment