Updated: 02/02/2016 - Sponsored by Leptigen

Think Thin Bars Review - Does This Protein Bar Supplement Work? Are gastrointestinal side effects and high calorie count deal breakers?

Editor's Review: 2.7 / 5.0

think-thin-bars-product-imageWe’ve heard a lot of buzz about Think Thin’s protein bars lately, so we decided to take a closer look. We did one of our in-depth reviews and examined the ingredients, side effects, clinical research, and customer-service quality. We followed that up by surveying scores of consumer reviews on the web; then we summarized and condensed our findings here to give you all the info you need.

EDITOR'S TIP: Combine Think Thin Bars with a proven fat burner such as Leptigen for better results.

What You Need to Know

Let’s get started. Think Thin protein bars are essentially a meal replacement product in the form of a snack bar. They don’t have to be used as a meal replacement, but the 20 g of protein may be able to get you through breakfast. The full ingredient list is as follows: 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.
These snack bars contain no sugar and are gluten free, so they are intended to be a healthy alternative to regular snacking. One plus is that they are easy to consume on the go or in the office.
Think Thin bars seem to be the first item that got Think Products started back in 2000, and the avoidance of sugar while packing in the protein is the product’s biggest claim to fame. The bars are available in health stores like Vitamin Shoppe and on its official website. We like the longevity of Think Products, and the general consensus from the web seems to be that ThinkThin bars have a great taste, but read on…

Gastric Side Effects–“Are They Worth the Bloating?”

After looking through reviews, our first concern with Think Thin bars is the side effects. “If you regularly eat Think Thin bars as an alternative to meals or unhealthy snacking, your body with undoubtedly appreciate the lack of sugar,” said our research editor, “but the high concentration of protein, the use of imitation sugars, and the other ingredients will probably leave you feeling bloated.” If you eat two Think Thin bars per day, you will consume 22 grams of sugar alcohol (in this case, maltitol).
“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.
For those who consume more than two or three bars per day, the side effects will likely get continually stronger. The European Journal of Clinical Nutrition reported that 40 grams of maltitol per day triggered abdominal pain in a control group; combine that with all of the protein found in Think Thin bars, and you may find the bars to be more cumbersome than helpful.

Scroll below for one of the best products we’ve seen over the last year.

Another Concern–High Calorie Count

Another fact that we found to be surprising was the relatively high calorie count. “Too dense and calorie-laden,” said one customer online.
“These bars are rather high in calories, and I did not like the texture,” said another. In reading through forums, many customers agree. Some people looking for a weight loss product may be frustrated by the high count. “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 one person.
Our research over the last few years has shown that if there is a significant drawback or two in a product, the likelihood of long-term success is slim. If you begin experiencing severe gastric side effects from the sugar substitutes and protein or you need to cut down on your calorie intake, you should carefully consider whether these bars are the right choice.
A recent WebMD article quoted the following from Liz Applegate, a lecturer at UC Davis: “[Someone] may think that these bars are better than food. But there are ingredients in foods that are missing from these bars,” Applegate says. “Just as you wouldn’t want to live only on peaches or only on tuna sandwiches, you need a lot more in your diet than just energy bars.”

The Science–Do Think Thin Bars Stand up to Their Claims?

From a scientific perspective, the sugar substitute maltitol isn’t as bad as other choices. 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. The high calorie count, however, doesn’t make Think Thin bars a friend to dieters. Losing weight is a simple process: burn more calories than you consume. ThinkThin bars seem more suitable to athletes needing the high-protein impact rather than to average people trying to burn a few pounds.

The Bottom Line–Should You Buy a Few Boxes at Costco?

Here’s the gist: We like Think Thin’s longevity in the market and the positive feedback we saw online about the taste, 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.
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.
One of the best products we’ve seen in 2015 is one called Leptigen. It’s a supplement that blends four powerful ingredient together in a proprietary formula proven to burn fat and boost metabolism. Better yet, each ingredient is clinically studied. There aren’t any harmful side effects, and online reviewers are thrilled with its performance.
There is currently a special trial offer, which goes a long way in showing that the company stands behind its product.

Learn More About Leptigen »
GD Star Rating

How Does Think Thin Bars Compare?

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

What You Should Know

Click Here To See Our Highest Rated Review

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.

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.

See Our Featured


  • 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.


  • 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 FAQ:

We spent countless hours researching all sorts of user comments and customer reviews about Think Thin Bars, and then we put all the information into this helpful FAQ.

What are the side effects of Think Thin Bars?

Possible Think Thin Bars side effects include: upset stomach, flatulence (gas), nausea, bloating, diarrhea and abdominal pains.

What are the ingredients in Think Thin Bars?

The ingredients in Think Thin Bars are: (Chocolate Almond Brownie Protein & Fiber Bar) protein blend (soy protein isolate, whey protein isolate, calcium caseinate), brown rice syrup, chicory fiber, dark chocolate coating (sugar, chocolate, cocoa butter, soy lecithin, vanilla), glycerin, almonds, alkalized cocoa, sunflower oil, soy crisps (soy protein isolate, tapioca starch), natural flavors, lecithin, sea salt, vitamin and mineral blend [magnesium oxide, dicalcium phosphate, ascorbic acid (vitamin c), niacinamide, pyridoxine hydrochloride (vitamin b6), riboflavin (vitamin b2), thiamin mononitrate (vitamin b1), vitamin a (as palmitate), folic acid and cyanocobalamin (vitamin b12)].

Do Think Thin Bars work?

There are actually several options when it comes to Think Thin Bars. These include Protein & Fiber Bars, Protein Nut Bars, High Protein & Fiber Bars, and Limited Edition Bars. The primary nutrients in these bars are protein, dietary fiber, and vitamins and minerals. Since these bars are low in calories, they should help with weight loss when consumed in place of high-calorie meals and snacks. Also, Think Thin Bars provide protein to help build lean muscles and reduce hunger, as well as fiber to assist with regularity. On the other hand, there is no solid clinical research that proves Think Thin Bars encourage fat loss.

You might want to think about substituting Think Thin Bars for a diet product that’s supported by published clinical research such as Leptigen.

How much do Think Thin Bars cost?

Each Think Thin Bar sells for $1.99, or you can purchase a pack of 10 bars for $17.90. If you buy six boxes of 10 bars, the price is $99.40.

How should I use Think Thin Bars?

You should eat Think Thin Bars in place of meals, as low-calorie snacks or as pre or post-workout snacks. This is intended to help reduce your daily calorie intake.

How do I contact customer service?

You can contact ThinkThin, LLC customer service by calling 1-866-972-6879 or emailing customerservice@worldpantry.com.

Can I eat Think Thin Bars if I have a health condition?

Individuals with health conditions and those taking prescription drugs should speak with a licensed doctor before eating Think Thin Bars. Also, women who are pregnant or nursing a child and people under the age of 18 should speak with a doctor before eating Think Thin Bars.

What do users like about Think Thin Bars?

Some users appreciate that several flavors of Think Thin Bars are available. Some customers also like that these bars are rich in protein and fiber.

What do users NOT like about Think Thin Bars?

Some users do not like the unpleasant side effects that Think Thin Bars can cause. Furthermore, some people have complained about the sugar alcohol in Think Thin Bars.

Are all Think Thin Bars sugar free?

No, the Think Thin Protein Nut Bars, Lean Protein & Fiber Bars and High Protein & Fiber Bars contain sugar.

Are Think Thin Bars certified as low-glycemic foods?

The Think Thin High Protein Bars are certified as low-glycemic foods.

Do Think Thin Bars contain any GMOs?

All Think Thin Protein and Fiber Bars are made without GMOs.

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

Aside from bulk discounts (buying numerous bars at once) on purchases, we’re not aware of any special deals on Think Thin Bars. 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 here to give it a shot.

56 User Reviews About Think Thin Bars

Leave comments below
  • 1

    Is there vitamin k in bars?


  • 2

    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.


  • 3
    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.


  • 4
    James Milligan

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


  • 5

    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!!!


  • 6
    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!


  • 7

    One word should cause you NOT to eat this product: HYDROGENATED


    Your Name

    A better word is GAS major gas and bloating these bars deliver!


  • 8

    To one of the reviews that wondered what sugar alcohol was…it is the artificial sweetner Malitol. It will bloat you up with gas and make your stomach hurt really bad. I don’t understand why this company can’t use Xylitol or Organic Stevia instead…totally beyond me. Why are they called Think Think? when the calories are high,fat grams are high, carbs are high and then top it off with a nasty fake sweetner to make our stomachs hurt. I tried to see the ingredients on some of the bars and there is NO link, just the calories, etc. It’s not worth wasting valuble money to feel bad. Sorry, I give 1/8 a star vote, please improve the sweetner.



    Thank you for posting this. :-(


  • 9
    William Tate

    Wonderful article! We are linking to this particularly great article on our website. Keep up the good writing.


  • 10

    I love these. They just came out with the crunchy nuts version. They keep me full for a few hours and I love the texture of biting into them. Kinda like a candy bar texture. My fav is the Chocolate fudge.



    Are Think Thin Bars safe for teenagers?


  • 11

    Yes, they taste great. There is just one big problem that I have with them. They bloat me and make me pass some nasty gasses. I mean it is annoying. I don’t want to fart all day long and stink up the places. And that’s how bad they are, especially the Think Thin + Fiber. Stay away, or you’re gonna blow up and smell!


  • 12

    I bought the brownie crunch Think Thin bar on the fly because I needed a protein bar. My intention was not for weight loss. I also liked the fact that it was gluten free. It was tasty. I am lactose intolerant but this bar did not give me any problems. I would buy it again.


  • 13

    the no sugar is impressive, but there is only two grand of fiber? and they taste nastyand have more calorie than my diet allows. I eat half a/ raw fruit or veggie. I use them and slim fast, and special k, and kind bars.i have lost nine pounds in three week. that’s as a meal replace in the slim fast plan.


  • 14
    patti vopnford

    what about the alcohol sugars?? what on earth are they? very confusing.



    Sugar is sugar… it is what is used in a lot of “no sugar” products… but sugar is sugar. BUT… the chocolate has Chocolate Liquor… this contains sugar!


  • 15

    YUM!!! The Creamy Peanut Butter tastes delicious!! Eating one as I write this… First time trying, so I don’t know if there are any weight loss-benefits yet. All I know, is it tastes batter than any bar I’ve ever tried, no sugar, and I’m already full and not even through the whole bar yet. I’m excited to try other bars.


  • 16

    I have been eating a think thin bar for breakfast everyday for the past couple of years. The creamy peanut butter is my favorite and it satisfies me for 3-4 hours… I have always eaten a low glycemic diet, exercised daily, and have maintained my weight with the help of these bars. Sometimes I even have one before i go to bed if I’m craving something sweet! I order in bulk through the company every few months. I love these bars as well as Quest bars and Kind bars.



    I agree with what Jenine wrote and am on the same regimen.


  • 17

    “Think Thin Bars do not really stand out from the rest of the supposed snack and meal replacing weight loss products available today.”

    I don’t understand how you can make that assertion. Think Thin bars do not have any sugar in them whatsoever. This is a huge difference from most snack and meal weight loss products. Especially when they are compared with other protein bars, which sometimes have up to 25-30 grams of sugar in a single bar.

    I agree with other users who praised these bars for their ingredient list and flavor as well. They also have significantly higher amount of protein than the average protein bar (two time as much as the typical protein bar).


  • 18

    LOVE these bars. So hard to find anything without sugar and they are both delicious and satisfying. I’ve been enjoying the chocolate fudge and have no complaints. They keep me full for hours and are supporting my weight loss goals. Anxious to try the other flavors.


  • 19

    I bought these bars on a lark. I have eaten just about every protein bar out there. These bars were so good, that I looked them up to buy in bulk. They were a great snack for me because I’m on the road alot and most stores carry junk bars loaded with sugar. I wanted a good balance. These buys surprised me and the taste was good compared to other protein bars. I would like to see more of a whey protein, but the soy will be o.k.


  • 20

    A girlfriend of mine told me that these bars caused her excessive flatulence. I didn’t believe her till I tried one…



    I thought it was just me! I was passing the GROSSEST gas and could not stop pooping! Ugh.



    It’s the sugar alcohols that cause the gastric issues, the gas and diarrhea.


  • 21

    Love these bars! I have to eat low glycemic, and it’s hard to find something for on the go. I eat half for a snack and the other half right before working out. They hold me over and help keep my blood sugar on target.


  • 22

    Does it actually help you loose weight?



    Not sure if they help you lose weight, I eat them a lot though.


    Your Name

    Protein bars are not intended to help you lose weight really. These bars have 240 calories in them. These can be use as diet supplementation or meal replacement. For example, I eat up to 7 small meals a day and always include a protein source. While real protein sources are best (chicken, fish, lean meat, egg whites), sometimes we don’t always have these readily available. I use these as one of my meals alongside of a raw veggie. If you are looking to restrict calories, I would eat a half a one alongside a veggie, as someone suggested.


  • 23

    Those of you that think it tastes gross, I’m going to say you consume a lot of sugar and/or lots of processed foods. Take refined sugar out of your diet completely and you’ll start to taste food again, for real. These bars taste great and are very sweet tasting to me, and appreciate the no sugar added. They are good for protein which helps supress appetite, but not recommended after a heavy weight lifting session at the gym. You shouldn’t have fat right after you lift. Give it a half hour/hour and then yes, fat is good for you. Well, you know what I mean – good fats, in moderation and in balance with carbs & proteins.



    I totally agree with you!! I just ate my second bar just as I was reading your post! I’m on that time of the month and I was craving chocolate so bad.. Bought a couple bars from different brands and this one is by far the best when it comes to flavor and sweetness I don’t consume sugar on a regular basis so I found them very sweet!! Perfect to trick my mind :-) .. I don’t know if I would eat them on a regular basis because they do have a lot of calories.. But in special occassions I would totally eat them.


  • 24

    Maybe it was that scarring week I spent at the Optimum Health Institute eating sprouts and drinking wheatgrass juice, but I love the taste of Think Thin bars. Aside from the “Natural Flavors” (which is who knows what), I am impressed with the ingredient list and the balance of macronutrients (proteins, fats, and carbs). Potassium iodide is even included, which is wonderful for our iodine-deficient society, scourged with high levels of subfunctioning thyroids and thyroid syndromes. That may be one reasons why these bars are promoted as weight loss and energy bars because the thyroid needs iodine to manufacture its hormones, which regulate the metabolism. Sugar alcohols, like Xylitol, have actually been touted as a form of tooth decay prevention. They are not tolerated well by some people, but for others the lower insulin spike it produces is very desirable. We need some carbs/sugars with our protein so that the body will release insulin and drive the protein into the muscle cells. As far as flavors go, I’m partial to peanut butter, not a big chocolate fan. The lemon ones are pretty good, too.


  • 25

    my wife and I really like these bars. they are low carb, high protein and low glycemic index so does not spike the blood sugar. These are not candy bars and make a great replacement. We use them as a snack or meal replacement (we try to eat small amounts, 6-7 times a day). The best part about these is that they do not make you crave for more. I eat one and do not need more to eat for another 2-3 hours.
    chocolate mudslide, crunch and chunky peanut butter are the 3 best flavors, though i do like the dark chocolate also (but they have caffeine and I drink enough of that).


  • 26

    im eating the chocolate mudslide right now, and it tastes absolutely disgusting.
    pretty much killed my appetite though.


  • 27
    Toni Stratos

    how many net carbs are there in the Think Thin bars?


  • 28

    I’m confused about the Think Thin bars, althought it states NO SUGAR – what about the SUGAR ALCOHOL that has 16g, sugar is sugar regardless of how is labeled. Also have you noticed the CARBS ???????

    I bought this and am going to return………



    I have gestational diabetes. Per my dietary instructions I can have a 2 carb snack which is 30g of carbohydrates. The bars I have, lemon cream pie flavor and chocolate only have 20g of carbs, that is not bad at all. I am not sure what the beef is, but the 15g of protien is very good compared to other bars with less than 9 grams. The price is good too. I have not had any problems using these as a snack. They do not affect my blood sugar level and I highly recommend them.


  • 29

    I agree with Dawn about the taste, the number of protein grams, and the A+ rating. I’ve had the chunky peanut butter bars, the white chocolate raspberry bites, and the lemon bars, and I liked all three. Considering that 20 grams of protein and the terrific low-GI effect, I think they taste good .. good enough to satisfy my dessert cravings while supplying lots of protein. They are not low-cal, of course, so they’re not an unlimited snack at all. I works good for me to cut them in half and wrap each half in foil or a baggy so I have a mid-morning and a mid-afternoon (10-grams-protein each) snack.


  • 30

    I’ve tried SO MANY different types of high protein bars for after a good workout, and these bars are the only ones I’ve found that don’t contain ANY sugar, which is a major plus. I wouldn’t use them as a meal replacement, but rather as a protein source after a workout. The taste is definitely something that you may need to get used to, but the fact that they are gluten free is great. Another good bar to try are the Premium Protein bars. They have 30 grams of protein and about the same amount of calories per bar that the Think Thin bars do (around 230). And while the best tasting bars so far have been the Clif Builder Chocolate Mint and Peanut Butter bars, they contain 20 grams of protein and 20 grams of sugar per bar.


  • 31

    Think Thin Bars are the best I’ve ever had. I have a gluten intolerance and these are allergen free for me. Also, all th eother bars with 20 grams of protein all also full of hydrogenated oils and nasty ingredients which are unhealthy and taste bad. Think Thin Bars are fabulous and delicious!



    I have only hsd the white chocolate raspberry bites, and I thinkthey are very good. I eat low glycemic, and it is hard to find bars that mmrt the requirements for that. These bars are A+ in my book.



    They are da best !! No sugar is de best


  • 32

    They taste AWFUL! Save your money.



    I disagree! these are my favorite bars and I’ve tried them alllll! I think taste is a matter of opinion…the thinkthin crunch is my favorite. it has a thin layer of chocolate and is super crunchy.



    yeah, I have to say these are my FAVORITE tasting of all the protein bars I’ve tried. I love the brownie one.



    I tried the creamy peanut butter and it has an after taste that I couldn’t get past. Couldn’t finish the bar. I will try a different flavor and see if it’s better.



    These are gross. They made me so full I almost threw up. No, I didn’t eat anything for hours afterward so I can see how you might lose weight. I am fairly active, but these are like a bunch of lead balllons. I would suggest running a marathon before or after eating.


  • 33

    I’m not trying to lose weight. I’m just trying to eat healthy. Sometimes I don’t have time to make a healthy breakfast. Is thinkThin good for a healthy breakfast? Could it cause you to gain weight?



    Think Thin bars are great for breakfast. I eat one everyday on my way to work and they keep me energized and full until lunch time. They do not cause you to gain weight.



    I’ve recommended these bars to so many friends. My next goal is to have the local WM superstore carry it as only one carries it and sells it for $1.53 while Whole Foods sells it at $2. I’ve been eating the creamy peanut butter bar every weekday morning for breakfast and it literally keeps me full for 3 hrs. I remember my first time trying this bar…I wasn’t even halfway through that I already felt a sense of “full”


    Your Name

    I think they are great! I eat them when I’m craving dessert, they are rich and sweet.


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