Updated: 04/18/2017 - Site operated by Leptigen
By Summer Banks Mar 20, 2017

We’ve heard a lot of buzz about Think Thin Bars. Our in-depth review focused on the ingredients, side effects, and clinical research. Furthermore, we examined hundreds of user comments and testimonials. Then, we summarized and condensed to give you all the info you need.

Think Thin Bars Readers: Click here to find out why we're giving away samples of our product, Leptigen.

What are Think Thin Bars?

First off, Think Thin Bars are meal replacements and snack products. [1] The ingredients are whey/soy protein isolate, hydrolyzed collagen, maltitol, cocoa butter, chocolate liquor, calcium carbonate, dairy oil, lecithin, vanilla, hydrogenated starch hydrolysate, glycerin, peanut butter, peanut flour, natural flavor, salt, mono and diglycerides, lecithin emulsifiers, vitamins and minerals. You can eat them on-the-go or as a substitute for breakfast, lunch or dinner.

Think Thin Bars is one of the first items from Think Products ; a company started in 2000. Local grocers and the official website sell the supplement. We like the longevity of the company, and that we found some positive customer comments, but read on…

Side Effects – “Negative or Positive?”

Our first concern is with Think Thin Bars side effects. “If you regularly eat them as an alternative to meals or unhealthy snacking, your body with undoubtedly appreciate the reduction in sugar,” said our Research Editor, “But the sugar alcohols in them may have a negative effect on your stomach.” [2][3]

“A girlfriend of mine told me that these bars caused her excessive flatulence. I didn’t believe her till I tried one,” said one user.

“Since I have been eating these, I notice major gas issues, bloating and minor diarrhea. I do not have a lactose allergy as far as I know since I can eat dairy problems without these symptoms,” said another.

On the other hand, we found reviews of Think Thin Bars with a different take on side effects.

“No issues with my stomach like others are saying,” commented a customer.

Think Thin Bars Ingredients – “High Calorie Count?”

Another fact that we found in Think Thin Bars reviews was the relatively high calorie count. [4] “Too dense and calorie-laden,” said one customer online.

“At 230 calories per bar (with 8g of fat – 12% of DV), you may ‘think thin’ all you want, it’s just not gonna happen,” said another. [5]

While some dieters complained about the calorie count, others didn’t mind, considering some use it as a meal replacement.

“Sorry, I don’t count calories. It gives me the nutrients needed,” said one person.

“I don’t count calories, as long as it fits my macros,” reported another.

Our research has shown that if there is a significant drawback with a product, the likelihood of long-term success is slim. There’s an issue if customers have concerns with the high calorie count of Think Thin Bars.

The Science – “Any Real Proof?”

From a scientific perspective, the sugar substitute maltitol isn’t as bad as other choices. [6] The National Library of Medicine has a number of published studies pointing to gastrointestinal side effects related to maltitol, but the flatulence and abdominal pain are more discomforts than dangers. [7] The high calorie count, however, doesn’t make these a friend to dieters. Losing weight is a simple process: burn more calories than you consume. [8] ThinkThin bars seem more suitable to athletes needing the high-protein impact rather than to average people trying to burn a few pounds. [9]

The Bottom Line – Do Think Thin Bars Work?

What are our final thoughts on Think Thin protein bars? We like the longevity in the market and the positive feedback we saw online. But, we have reservations about the bars as they relate to weight-loss. The high calorie count could be a detriment to dieters, and the sometimes-intense abdominal discomfort associated with that much protein and maltitol may discourage someone trying to trim down. [10]

If you are trying to lose a few pounds or get a little bit more trim, you should probably look for a product that won’t make you gassy and bloated. Also, your supplement shouldn’t add to your daily calorie intake.

Among the best products we’ve seen this year is one called Leptigen. The supplement contains four clinically-tested ingredients , which have been shown to possibly help burn fat and boost metabolism. Online reviewers are thrilled with its performance, and there’s no talk about harmful side effects.

Also, the company behind Leptigen is so confident in their supplement, that they’re offering customers a Special Trial Offer.

Previous Think Thin Bars Review (Updated September 20, 2012):

Think Thin Bars: What You Should Know

Think Thin Bars, manufactured by thinkThin, are marketed as a protein bar that promotes weight loss and increases energy. It is suggested that these bars be used as a snack replacement and perhaps to replace either breakfast or lunch. Think Thin Bars seem to be targeted to male bodybuilders, but they are said to beneficial to any adult wanting to lose weight or increase energy regardless of gender, age or fitness level.

The website for Think Thin Bars provides very little information on them. There are no user testimonials posted and there is no evidence posted to prove that they can do what they are advertised to do. Those wishing to try Think Thin Bars can do so without a prescription because they are considered food.

List of Ingredients

Vitamin A, Calcium, Calcium Caseinate, Whey Protein Isolate, Soy Protein Isolate, Hydrolyzed Collagen, Maltitol, Cocoa Butter, Chocolate Liquor, Calcium Carbonate, Dairy Oil, Lecithin, Vanilla, Hydrogenated Starch Hydrolysate, Glycerin, Peanut Butter, Peanut Flour, Natural Flavor, Salt, Mono and Diglycerides, Lecithin Emulsifiers, Tricalcium Phosphate, Vitamin C, Vitamin E, Niacin, Iron, Zinc, Pantothenic Acid, Vitamin D, Vitamin B6, Copper, Riboflavin, Thiamin, Folic Acid, Biotin, Iodine and Vitamin B12.

Think Thin Bars: Product Features

Think Thin Bars come in a variety of flavors such as Caramel Swirl, Chocolate Fudge, Crunchy Peanut Butter, Creamy Peanut Butter and Brownie Crunch.

Advantages of Think Thin Bars

  • Think Thin Bars are now available at a reduced price.
  • This product contains several essential vitamins and nutrients.
  • Think Thin Bars are free of gluten, sugar and wheat.

Disadvantages of Think Thin Bars

  • There are artificial flavors in Think Thin Bars.
  • Those with a peanut allergy should not use this product.
  • Anyone taking certain medications or with certain medical conditions should consult a physician before consuming this product.
  • Think Thin Bars contain a high amount of calories.
  • There is no research cited to prove the effectiveness of this product.
  • There are no user testimonials posted for this product.
  • Those with lactose intolerance may not be able to consume Think Thin Bars.


Think Thin Bars do not really stand out from the rest of the supposed snack and meal replacing weight loss products available today. Think Thin Bars may not be an effective weight loss product because there does not seem to be any proven appetite suppressants or fat burners in it so those seeking a weight loss supplement with the ability to suppress the appetite and burn fat may want to research other products that are intended for appetite suppression and fat burning. Those seeking weight loss may also benefit from developing a healthy diet and exercise program that suits them and their lifestyle. Users will need to assess their health and fitness goals and decide if using Think Thin Bars is right for them.

Think Thin Bars Questions & Answers:

We spent countless hours researching user comments on thinkThin Bars to put together this helpful FAQ.

What are the side effects of Think Thin?

Possible thinkThin Bars side effects, according to customer comments, include upset stomach, flatulence (gas) [1], nausea, bloating, diarrhea and abdominal pains, as shown in some user reviews.

What is in thinkThin Bars?

The thinkThin Bars ingredients are soy protein isolate, whey protein isolate, calcium caseinate, brown rice syrup, chicory fiber, sugar, chocolate, cocoa butter, soy lecithin, vanilla, glycerin, almonds, alkalized cocoa, sunflower oil, tapioca starch, natural flavors, lecithin, sea salt, vitamin and mineral blend.

What is the active ingredient in thinkThin Bars?

The active ingredient in thinkThin Bars is protein.

Do Think Thin work?

Since these bars are low in calories, they could help with weight-loss when consumed in place of high-calorie meals and snacks [2]. On the other hand, there is no solid clinical research that proves thinkThin Bars help you lose weight or ignite fat loss.

You might want to think about combining thinkThin Bars with a proven fat burner, such as Leptigen, which contains clinically-tested ingredients, which have been shown to work.

How much does a box thinkThin Bars cost?

A box of thinkThin Bars costs $17.90 for a 10-pack.

How do you use thinkThin Bars?

You should eat thinkThin Bars in place of meals, as low-calorie snacks or prior to exercise.

Who makes thinkThin Bars?

The makers of Think Thin is thinkThin LLC.

How do I contact the thinkThin Bars customer service department?

You can contact the thinkThin Bars customer service department by calling 1-866-972-6879 or emailing customerservice@worldpantry.com.

Can I contact Think Thin through social media?

Yes, you can contact them on their Facebook or Twitter.

Can I eat thinkThin Bars if I have a health condition?

Individuals with health conditions, those taking prescription medications of any kind, people under 18 years of age or women who are pregnant or nursing should contact a healthcare professional prior to using a meal-replacement product, including thinkThin Bars.

What do users like about thinkThin Bars?

Some users appreciate that several flavors of thinkThin Bars are available and contain protein and fiber.

What do users NOT like about thinkThin Bars?

Some users do not like the unpleasant side effects that thinkThin Bars can cause.

Are all thinkThin Bars sugar-free?

No, not all thinkThin Bars are sugar-free. Protein Nut Bars, Lean Protein & Fiber Bars and High Protein & Fiber Bars contain sugar.

Are thinkThin Bars certified as low-glycemic foods?

Only the thinkThin High Protein Bars are certified as low-glycemic foods.

Do thinkThin Bars contain any GMOs?

The Thin Protein and Fiber Bars are made without GMOs.

Do you know of any special deals or discounts on thinkThin Bars?

There are special deals and discounts on the thinkThin Bars official website, if you make purchases in bulk. However, the last few months many of our readers have been really excited about Leptigen’s Special Trial Offer, which is just the cost of shipping and handling. Click above to give it a shot.

Think Thin Bars Side Effects:

Think Thin Bars are protein bars that are supposed to be used as a healthy alternative to regular snacks. It can also be used as a meal-replacement. We are aware that side effects aren’t common. Though that is true, we wanted to prove to you they still can, by showing you user comments.


“…I had serious stomach cramping issues and spent the entire day in bed (and in the bathroom) and in agonizing pain – diarrhea, gas, bloating and nausea.”    Aimee


“…this caused tremendous diarrhea.”    James


“I was up half the night in severe pain from bloating, gas, diarrhea, and nausea.”    Jared


“…they give me terrible gas and bloating–miserable!”    Joy


“…they cause awful gas…it’s uncomfortable…”    Kristen


“They cause major bloating and awful stomach cramps.”    Deborah


“…the muscles in my calves started to ache and then my joints felt like I was getting sick with something.”    Bonnie


“[It] gives me horrible bloating and gas.”    Danielle


“It left a metallic tingle and itch on my tongue.”    Martha


“I got these and had horrible gastric bloating and abdominal discomfort.”    Pentha


  • References
  • 1. (). . .

Think Thin Bars Ingredients and Supplement Facts

Serving Size:
Serving Per Container:
Amount per Serving % DV

Other Ingredients: None

After thoroughly investigating the Think Thin Bars ingredients, we provided the specifcs you really need.

Whey Protein Isolate

To start, whey protein isolate is actually a by-product of cheese manufacturing. It’s also available in concentrate and hydrolysate forms. Often this ingredient is free of fat, cholesterol, carbohydrates and lactose. It’s commonly used in protein powders, shakes and bars.

What is it Supposed to Do?

Typically whey protein isolate is included in supplements to help build lean muscle mass. It’s also intended to boost energy levels and reduce appetite. It can be consumed in place of foods that are high in fat and calories. This may aid with weight-loss.

Clinical Research

According to research posted on the Mayo Clinic website, “Overall results suggest that whey protein may promote better weight-loss when compared to lower-protein diets.” [1] Therefore this ingredient may be beneficial to those trying to shed excess pounds.

Clinical testing is very important if you’re trying to pinpoint a diet supplement that actually yields results. This is why you may want to take a look at Leptigen. It contains some ingredients that have been researched.

Soy Protein Isolate

Firstly, soy protein isolate is essentially taken from soybeans. It’s a non-animal source of protein that is used in countless shake powders and bars. Also, it’s low in calories, and free of cholesterol and saturated fat.

What is it Supposed to Do?

Like whey, soy protein isolate is intended to curb hunger and elevate energy levels. It’s also supposed to help with muscle building and overall fitness. Furthermore, it should not raise blood glucose levels or cause any cardiovascular problems.

Clinical Research

While soy protein isolate may not directly cause fat loss, it has been linked to certain health benefits. For instance, The University of Maryland Medical Center says, “Studies suggest that soy protein may reduce the risk of heart disease by lowering levels of LDL (bad) cholesterol. For example, in a clinical study of nearly 5,000 men and women living in Japan, those who ate the most soy had the lowest cholesterol levels.” [2]

Calcium Caseinate

Okay, calcium caseinate is a protein that’s used in all kinds of creamers, instant soups and supplements, including shakes and bars. It’s derived from the casein in milk. It provides amino acids to benefit the muscles.

What is it Supposed to Do?

Generally calcium caseinate is added to supplement shakes and fitness products to help improve lean body mass and reduce appetite. It may be used in meal-replacement drinks and bars to help you reduce your overall calorie intake as well.

Clinical Research

There is some solid research that supports calcium caseinate for weight management. One study published in 2013 in the “Journal of Sports Science and Medicine,” revealed that “Women who supplemented with casein for eight weeks and completed their usual workouts experienced a “significant” change in body composition, losing more body fat than they had previously.”

Is There Anything Out There That We Think TRULY Works?

We did find one supplement that stands out. Leptigen, which contains powerful ingredients that HAVE been clinically tested, may be a good option. Note that all customers can take advantage of a Special Trial Offer, that’s available. Click above to give it a try.

  • References
  • 1. Whey Protein Evidence (2013). Mayo Clinic. December 17, 2016.
  • 2. Soy (2016). University of Maryland Medical Center. December 20, 2016.
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Dietspotlight Author
About the Author:

Summer Banks, a content strategist at Leptigen, has researched over 5000 products in the past 10 years. She has years of nursing training, experience as a manager responsible for 15 supplement brands, and completed coursework on Food and Nutrition from Stanford University. full bio.

Rating: 3.4. From 135 votes.
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User Comments (84)


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after gastric sleeve surgery, I need to consume lots of protein. Getting off sugar was hard to do! Think thin bars did the trick! They fill me up totally, and I can eat 2 bars a day as meal replacements. Then I can eat a good protein packed dinner and be fine. I love the taste and texture and I do not have the gas others have experienced. They are perfect for me, as opposed to other protein bars that have 30+ grams of sugar.


I agree, Think Thin work great for me. I don’t crave sugar and fat like I have in the past. It fills me up and satisfies as a meal replacement. Down 8 lbs and still on track.

Your Name

I don’t like the texture or the taste. It is like eating something that is not edible, almost as if I’m eating playdough. And it gives me stomach aches.


These give me EXTREME gas. I had to cancel going to a partly last night because the side-effects of these bars made me not nice to be around. I’m also hugely bloated. Ugh. Next time, I’ll stick to eating chicken and bananas.


I tried these bars because I had developed a really bad habit. Each morning I had to have something sweet with my coffee. Cake, cookie, anything. I was able to break the bad habit with these bars. I only needed half of one with coffee and used the other half later as a treat. No side affects whatsoever and it helped me beat my extreme sugar addiction. I love the creamy peanut butter the most. It has a chocolate coating and the inside has sort of a marzapan consistency. Just love ’em!


I’ve been eating these for about a week now, I go to the gym for like an hour everyday and I just eat them for breakfast everyday and then eat greens/chicken and stuff for lunch/dinner. Will this help me lose weight? I’m 5’2 and 130 pounds and am trying to lose some belly fat and tone up. Really need to know so I’m not wasting my money or start gaining weight!


Kayla. I eat these either as a supplement for breakfast or as my breakfast before I workout and eat something like cereal or oatmeal afterwards. My Crossfit coach said high calorie protein shakes and protein bars are fine as long as you don’t go eat a huge calorie meal afterwards like fried chicken ect. I honestly don’t think 240 calories is that high IMO. if you are working out you need the energy and calories and you will still burn it. Plus there is no sugar so it’s not turning into fat either. If you are concerned just track your calorie intake each day. There are 3500 calories in a pound of fat. But no these bars will not make you gain weight or lose progress. I love them so much and I continue to lose weight (slowly bc I’m naturally leaner at 5’8 and 133 lbs) I was 144 last summer and I do Crossfit and eat these bars. smile them and quest bars I’m like addicted to bc they actually taste good and not chalky and don’t have sugar. smile


Thanks! I just came across this website again and didn’t even remember I commented 😂 I still eat them for breakfast and i feel they are a good meal replacement! Thanks for the advice! And yeah, the no sugar thing was a deal breaker for me! It’s just kind of discouraging seeing all of the bad reviews, but I think I’ll stick to em. ☺️


Working for me Kayla, 8 lbs down and all off my stomach.


I love think thin bars! I have no side effects at all, and i add them daily as 2 meal replacements for breakfast and lunch. For dinner i eat almost carb free and sometimes as a snack low fat quarkcheese or a few almonds. These combo seems awesome for weightloss. I absolutely love the taste from think thin bars and makes me quite full. My favourite! I also like the quest bars, but i don t like the aftertaste so much and it doesn t keep my satisfied for hours. So think thin bars are the way to go for me.

Darcy Tom

The thnkthin Protein & Fiber Bars are only 150 calories, delicious and NO TUMMY effects!


I think they are great! They taste good and they have a lot of protein in them and that is what I am going for. Low carb, high protein. Although they do have a lot of carbs in them, 22 grams, but I am not sure if it is the good carb or the bad carb. I eat them for my lunch, everyday.


wow recently I am having gas also but never thought putting it together with this bar. I ll stop having them and curious of the result. Thanks for this article.


One bar destroyed my stomach – lot of gas smile Turned me into a fartbag

Your Namepat brandeberry

do all of the bars have chocolate and milk in them


Hi Pat! For detailed product information, please refer to the Think Thin Bars official website to learn more.


I started to eat these because compared to the other protein bars they do not have the excessive sugar. I do not have problems as far as the gas issue is concerned. I eat well, exercise, and it helps that my job makes me walk at least 4 miles a day. These protein bars allows me to get my protein in for the day without the crap that is associated with some protein bars.


I use think thin bars as a way of getting energy for my runs. I have been eating them for over a year now. Coupled with exercise these things work great. If your not planning on exercising to lose weight then they might be too high calorie. For what I use them for (energy) they do the trick. The gas and bloating. I guess that is a side effect I have experienced and I had no idea that’s how I was getting it. I guess I will have to look for another bar that doesn’t have the ingredients that cause this, darn it!


i absolutely love think thin bars! However, after I eat one, my whole entire body itches uncontrollably. I couldn’t figure out what was doing this. I was feeling just fine today, had one with my evening tea, and BAM within 10 minutes, I was downing Benadryl and slathering on hydrocortisone cream! It dawned on me, this is what it was!!! Anyone wake have this side effect?


I get the same affect when I eat them, ten minutes after I’m itchy like crazy but I’ve had all the ingredients at one point of time or another. So I can’t figure it out. No food allergies that I know of.


I don’t like a lot of proteins, meats etc.,so I’ve been taste testing lots of protein bars and shakes in the past few months. Have yet to find a shake that doesn’t taste like vomit and I feel the same about most of the bars but this one is the best hands down. I have only tried the peanut butter/chocolate and the chocolate fudge, can’t decide which one is better! My only confusion is with the sugar, there are different forms of sugar besides high fructose corn syrup so I wouldn’t say these are 100% sugar free. But I’m eating them strictly for the protein.


This was the most nasty thing I have ever eaten. Actually, I didn’t even swallow it, it was so horrid.


Is there vitamin k in bars?

Your Name

How many carbohydrates in the bars




I eat the Think Thin bars all the time. Well, I mean everyday. I eat them for my lunch along with a yogurt. They taste better than any other protein bar I have tried and I have tried a lot of them. I really like the peanut butter ones. I am on a low carb, high protein diet. I think these are the best.

James Milligan

I can’t seem to find out whether or not think thin has natural vitamins or synthetic.


The Think Think bars taste superior to other protein bars but since I have been eating these I notice major gas issues, bloating and minor diarrhea. I do not have a lactose allergy as far as I know since I can eat dairy problems without these symptoms. Taste wise they are great but the side effects will keep me from buying these again.

Your Name

Try a quest bar!!!

Melinda P

I think these bars are super yummy. I don’t feel guilty eating them when I want something chocolaty to sink my teeth into. Afterwards, I don’t feel hungry for hours. They make a great snack to keep in your desk at the office!