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Average: (1,387 votes) 4.8

After reviewing 1,000’s of products, Xentermine is the clear winner due to the positive customer feedback and award-winning formula.

Alli: Full Review

Overall Alli Score: 2.5/5.0
allie diet pill review

Weight loss is a very difficult task. Tons of people struggle to lose weight, it’s normal. But, that doesn’t make it any easier to accomplish. This is why a lot of people look for weight loss supplements and diet pills. They can be a helpful and effective tool for reaching your weight loss goal, but it can be hard to figure out which one to choose. 

We investigate the pros and cons, prices, ingredients, the claims, how this product works and more! So, let’s go ahead and take a deeper look into this pill to find out what Alli can do for you and what it can’t. 

What Is Alli?

Alli is a diet pill made of a synthetic ingredient called orlistat. This product claims to improve weight loss results by reducing the amount of fat that the body absorbs. It can be purchased in stores and online without a prescription. It appears to be the perfect weight loss solution, according to the sponsored ads that have been posted all over the internet.

So, what’s the catch? Well, in a nutshell, this diet pill causes side effects. While some of the side effects can be avoided if you are on a low fat and low calorie diet while using this pill, others can happen no matter what you do. Essentially, for this product to be moderately safe and effective, the person taking it needs to use traditional weight loss methods that could have a similar effect on their own.

Why is Weight Loss Important?

People want to lose weight for many different reasons, but, when it really comes down to it, we’re all here for the same general purpose. Regardless of why we want to lose weight, we want to. 

Our favorite aspect of weight loss is the benefits it can have for your health, both physical and mental. The physical benefits are usually more talked about than the mental. People love the physical changes that come along with weight loss, such as reducing blood pressure, cholesterol, and blood sugar. Plus, getting a body that you feel confident in, isn’t the worst part of the deal. 

One review researched published studies that had measured the effects that weight loss has on quality of life. Researchers gathered 20 studies that fit into this description and contained the needed criteria. This review found that weight loss can help improve the quality of life in adults. (2) And who doesn’t want a better quality of life?

How Long Does Alli last?

When taken as directed, each bottle of 60 capsules will only last you 20 days. We typically look for supplements that have at least a 30 day supply because that is the industry standard. 20 days is somewhat close to 30, so with this supplement you’re really only missing ⅓ of the time that you get in most products. 

Who Is Alli For?

This supplement can be taken by anyone who is 18 years or older with a BMI of 25 or higher. We have found that it is most useful for people who want small weight loss and are willing to consume a low fat and low calorie diet.

It is very important that you talk to your doctor before you start using this product, especially if you have any pre-existing medical conditions or are taking any medications.

What’s The Best Way To Use Alli?

This supplement recommends you take 1 capsule with each meal that contains any fat. They suggest that each meal should have 15 g or less of fat. 

While a low fat diet can increase weight loss on its own, that isn’t the only purpose for its recommended consumption with this pill. A low fat diet is also suggested to help lower the chance of irregular bowel movements from this product. 

Alli can reduce the efficacy of fat soluble vitamins, so it recommends also purchasing and using a multivitamin. 

Their website also recommends that while taking this product you should limit yourself  to 3 “well-balanced” meals and only 1 snack each day. Plus, the directions also recommend that you also eat a reduced calorie diet while taking this product. 

What Do You Get in Alli?

Each bottle of Alli contains 60 capsules, one of which should be taken 3 times every day. So, in each bottle of Alli, you get a 20 day supply. In the weight loss world, there is an industry standard of at least a 30 day supply in each bottle. Although, this amount is a bit below the bar, we’ve seen worse. 

Each capsule only contains 60 mg of product which is a very low amount for weight loss supplements. This supplement only contains one ingredient, which isn’t necessarily bad, but often makes a weak formula that can’t provide you with full benefits. However, maybe one ingredient is all you need? Let’s investigate this diet pill a little further to figure out what exactly 3 servings of orlistat a day can do for you.

Alli Ingredients

So far we have yet to see any evidence supporting this pills ability to aid in real weight loss, besides telling you to take vitamins and consume a very low amount of fat and calories. So, let’s take a look into the formula. 

It only contains one ingredient and, while this is a good start, we typically look for formulas that are more well rounded so they are able to give you better weight loss support. This ingredient is synthetic, so it is made somewhere in a lab. It is usually nice to know that the ingredients in a weight loss supplement are natural, unfortunately, this pill is not.


In this pill, there are 60 mg of the one and only ingredient, orlistat. This product uses a synthetic version of orlistat instead of using the natural source. It was designed to prevent some of the fats that you eat from being absorbed. This is a good strategy, however, in order to avoid some of the side effects it is important to keep a low fat diet. Which seems a little counterproductive. 

In a study done to test the effects of orlistat on weight loss a group of 80 subjects participated in a randomized, placebo controlled experiment. The treatment group received 120 mg of orlistat 3 times a day (twice as much as Alli contains) and the placebo group was given a placebo pill 3 times a day. There was a reduction in weight and BMI in the treatment group when compared to the placebo. However, only the orlistat group showed side effects, including: abdominal pain, oily stools/spotting, fecal urgency, and loose stools. (1)

How Does Alli Work?

The goal of this product is to prevent some of the fat you eat from being absorbed. However, they also suggest that you should be on a very low fat and low calorie diet while taking this product. This strategy does feel a little counter productive, but some people have found that it can work a little bit. 

This strategy is often used in diet supplements and can be very effective. But, usually supplements try to incorporate multiple strategies, in addition to blocking fat absorption, that help to support weight loss. Having only one way to improve weight loss is a good start, and can be effective for some people. Unfortunately, most people are looking for a more powerful formula that can benefit weight loss in multiple ways. That being said, one strategy is better than none. 

Some of the side effects that are caused by Alli are supposed to happen and are “evidence” that it is working. You can see this in the oily anal discharge that is a result of consumed fat not being digested. Most products recommend living a healthier lifestyle in order to make their products more effective, but it’s not a requirement for them to work and to avoid unwanted side effects.

How Does This Formula Compare To Other Formulas?

This formula does have a small amount of evidence supporting its benefits, but that same evidence shows the negative side effects that come with the use of this product. We typically recommend finding products that don’t have side effects or at least less severe ones. 

It also only consists of one ingredient. Relying on one ingredient can be an effective strategy but, we have found that a variety of ingredients tends to be more effective. Plus a combination of different ingredients can help reduce the possibility of side effects. 

A lot of weight loss supplements also come with a 30 day supply and money back guarantee. Because having at least a 30 day supply and a 60 day money back guarantee is the industry standard, it’s a little disheartening to see that this product doesn’t have either. It isn’t a huge red flag that Alli doesn’t come with these benefits, but it is comforting when products have them.

How Much Does Alli Cost?

It really depends on where you purchase it from. One bottle of 60 capsules (a 20 day supply) costs anywhere from $39.94 to $50.49 plus shipping. If you go to the official website you can get a coupon for $5 off a bottle of 60 capsules.

Alli Pros:

  • Scientifically studied ingredient
  • Can support small weight loss

Alli Cons:

  • Causes multiple unwanted side effects
  • Requires a strict diet to work and avoid some of the side effects
  • Each bottle only comes with a 20 day supply
  • No money back guarantee 
  • Only contains one ingredient

Side Effects:

This supplement comes with a long list of possible side effects. People have found nausea, vomiting, stomach pains, liver failure, diarrhea, itching, headaches, skin rashes, back pain, anal leakage, and weakness. It is also important to note that orlistat, the only ingredient in this diet pill, has been known to cause severe liver damage

Although some of these side effects are more severe than others, they are supposedly uncommon according to that official Alli website. Unfortunately, while used in research side effects were easily found. (1) 

Fortunately some of the side effects can be avoided, mostly regarding digestive issues. If you are on a low-calorie and low-fat diet, it can help to avoid these types of problems. 

What Are Customers Saying?

People who have used this product have found that it can help a little bit to excrete fat before it is digested. Unfortunately, there were quite a bit of complaints because of the side effects that it caused and because of the low effectiveness on weight loss. 

We are disappointed with how many customers got no weight loss benefits and had a lot of bad side effects.

Users have found that it can be used as a laxative if your bowels are blocked. This can be very useful for a lot of people, but it is a little expensive for a simple laxative if that’s all you want.

Alli Bottom Line:

Overall, this isn’t a horrible product. We’ve seen much better, but we’ve also seen worse. This product does have evidence supporting small weight loss support at larger doses, however, the use of orlistat causes side effects.

We typically look for supplements with more ingredients that can help you get more well rounded, healthy, and side effect free weight loss support. Because this supplement only contains one ingredient, the benefits are a little limited. 

This diet pill may not be the best option, but it isn’t the worst either. If you’re looking for a powerful weight loss supplement that can give you the results you want in a reasonable time frame, without side effects, we suggest looking into other options. 

Alli is a good option for people who are already on a low-calorie and low-fat diet and are looking for a very gentle weight loss pill. What it really comes down to is what you are looking for in a diet pill.


A money back guarantee? 

It’s very unlikely. Usually when a product comes with a money back guarantee it is expressed on the bottle or website and it is very easy to find the details of it. Since there is nothing regarding a money back guarantee, we assume that it doesn’t have one.  

Does Alli have an auto-pay program?

When you purchase on Amazon, you can sign up for a subscription that takes money from your account every 2 months and sends you more of the product. This diet pill cannot be purchased from the official website, but, there are alternative places you can purchase it that won’t attempt to set you up with a subscription. 

Is this diet pill kosher or vegan friendly? 

Unfortunately, this diet pill is not kosher or vegan because the capsule originates from pork. 

Why should I purchase Alli?

Alli is a decent diet pill. The reason you should purchase it really depends on what you are looking for in a supplement. You should purchase it if you are looking for small weight loss and plan to stay on a low-calorie and low-fat diet. It is also important to note that if the product is working correctly you will experience some side effects, which is something you should prepare for before taking it.

Is Alli better than other brands?

Alli is better than some brands and there are some brands that are better than Alli. What is the biggest deciding factor on if “Alli is better” is what you are looking for in a diet pill. There are products with smaller and larger supplies. Some products have more and more severe side effects and others have less. It really depends on what other product you are comparing it to. 


    1. Akat, Pramod B. et al. “Evaluation of efficacy and safety of orlistat in obese patients.” Indian Journal of Endocrinology and Metabolism. 2011 Apr-Jun; 15(2): 99–104. doi: 10.4103/2230-8210.81938
    2. Kroes, Michel et al. “Impact of weight change on quality of life in adults with overweight/obesity in the United States: a systematic review.” Current medical research and opinion vol. 32,3 (2016): 485-508. doi:10.1185/03007995.2015.1128403

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