Leanbean is a weight loss supplement targeted to women. The company claims that this product reduces cravings and calorie intake, as well as supports fat metabolism.
In this article we’ll review the ingredients in Leanbean based on medical research to determine if it’s likely to be safe and effective.
Leanbean contains 11 different active ingredients, all of which we’ll review for weight loss efficacy: Vitamin B6, Vitamin B12, Chromium, Zinc, Potassium, Glucomannan, Choline, Garcinia Cambogia Extract, Green Coffee Bean Extract, Turmeric Powder, Acai Berry Extract, BioPerine (black pepper extract).
We can’t find any evidence at all that Vitamin B6 supplementation or Vitamin B12 supplementation in humans improves weight loss outcomes. While one animal study found that B-vitamin supplementation could reduce body weight gain, the doses used were thousands of times higher than that in Leanbean. The B-vitamin doses in this ingredient are relatively low and could easily be obtained through food.
Chromium may be effective for weight loss, but the amount in Leanbean seems to be significantly underdosed. A medical review of chromium for weight loss published in the Obesity Reviews journal analyzed 11 individual studies on the topic and found that on average supplementation of chromium did cause reductions in body weight.
The lowest chromium dose used in any of the studies was 137 micrograms (mcg)/day, and many of the studies used at or over 500 mcg of chromium. Leanbean contains 11.67 mcg, which is less than 10% of what seems to be the minimally-effective dose.
We haven’t come across any research on human subjects suggesting that potassium is effective for weight loss, but regardless it doesn’t matter much because the dose used in Leanbean is so low as to be almost pointless.
Leanbean contains 3 milligrams (mg) of potassium. According to FDA research, one apple contains 260 mg of potassium and one banana contains 450 mg. You don’t need a supplement to provide you with 0.6% the potassium of a banana.
Zinc is the final ingredient from the vitamin and mineral blend, at a dose of 3.67 mg. We identified two clinical trials showing zinc may help with weight loss, but the dosages used were 20 mg and 30 mg, respectively. This suggests the amount in Leanbean may be underdosed.
Glucomannan is the next-listed ingredient, and it’s a purified flour from the konjac plant. It’s the main active ingredient in the Lipozene weight loss supplement which we previously reviewed.
This compound has been shown in one clinical trial to be effective for weight loss in human subjects, but the dosage was 3.99 grams(g) daily, while the dose in Leanbean is only 1 g.
A meta-study on glucomannan supplementation and weight loss analyzed 9 individual trials and found no effect overall. We can conclude that this ingredient is ineffective and underdosed in Leanbean.
We could only locate one article suggesting choline is effective for reducing body weight, but subjects were taking a daily dose of 2 g, which is nearly 100x higher than the dose in Leanbean.
Garcinia Cambogia Extract also seems to be significantly underdosed in Leanbean. A medical review found that it was effective for short-term weight loss, but all of the analyzed studies included doses higher than 1 g. The dose in Leanbean is 33.33 mg, or about 3% of what appears to be the minimally-effective dose. We don’t recommend garcinia regardless due to toxicity concerns.
The final four ingredients (green coffee bean extract, turmeric, Piperine and acai berry extract) are extremely underdosed, following the trend of most of the ingredients we’ve covered in this review, so we don’t see a need to review them individually.
As an example, Leanbean contains 16.67 mg of turmeric powder. This isn’t even a concentrated extract, just a raw powder that’s exactly the same as the turmeric you buy in the grocery store.
While curcumin, the active ingredient in turmeric, may be effective for weight loss based on medical research, the curcumin dose alone needs to be over 1,000 mg based on the linked study. And curcumin is just one compound in turmeric, while the entire turmeric dose in Leanbean is 17 mg.
Overall we find this to be a very poor formulation. Some of the ingredients seem to be effective for weight loss based on medical studies, but nearly all of them appear to be underdosed in Leanbean, often significantly. We didn’t find one single ingredient in Leanbean that appears to be effectively dosed for weight loss.
Leanbean’s site does recommend 6 capsules a day, which equates to three servings, but this doesn’t change our opinion because most of the ingredients seem to be so significantly underdosed that even multiplying the dose by 3 wouldn’t get them in the effective range.
For consumers seeking weight loss supplements, we recommend fiber powder, which is both cheaper and should be more effective than Leanbean.
Increasing fiber intake has been proven in medical research to lead to increased weight loss in humans.
The reason increased fiber intake is so effective for weight loss is because it makes you feel full without increasing calorie intake. This is why 100 calories of salad can be filling while 100 calories of a burger wouldn’t be filling to any adult.
For consumers who prefer supplements to food-based forms of fiber, psyllium husk is a cheap and effective option. It’s a fibrous powder that’s made from the husks of a plant, and can be added to water or other beverages like coffee multiple times a day.
Psyllium is the form of fiber used in many popular GI supplements like Colon Broom, but we recommend buying it alone rather than a branded version as it’s cheaper.