Slendesta Review - Does This Ingredient Work? Are lack of results and scientific evidence deal breakers?
Slendesta isn’t your grandmother’s diet product. Our in-depth review focused on the ingredients, side effects, clinical research and the quality of customer service. Additionally, we examined hundreds of user experiences and comments. Then, we summarized and condensed to give you the info you need.
What is Slendesta?
First off, Slendesta is a branded form of protein. The only ingredient listed is white potato extract. When consumed, it supposedly suppresses appetite, allowing you to feel fuller longer and eat less. There’s no recommended daily serving.
Slendesta is made by Kemin; a company that’s been around since 1961. This one’s sold as a stand-alone ingredient, as well as a part of the formulas of select dietary supplements. We like the strong foothold in the industry and that we located some positive customer comments, but read on…
Lack of Results – “Still Hungry?”
The first problem was the lack of results from Slendesta ingredients. “This one aims to reduce appetite and minimize caloric intake,” said our Research Editor. “But we had trouble finding actual users that noticed any changes.”
“I feel like I just spent money on a placebo,” said one user.
“I don’t see this working, I’m just as hungry as ever, and am not losing any weight,” explained another.
The product may not work for some, but other Slendesta reviews painted a different picture. One dieter stated, “This product definitely does what it says, but you need to take it 1 hour to 1 1/2 hours before a meal.”
Another commented, “I think this does take the edge off of appetite if taken earlier enough before a meal and with plenty of water.”
Scientific Evidence – “Is Slendesta Proven Ineffective”
According to some Slendesta reviews, dieters turned to science to see if this one worked. “After seeing no results, I researched online and found a study proving that this doesn’t work,” said one disappointed review.
“I bought this product and now I found out that there’s no scientific evidence that white potato extract helps suppress appetite,” said another.
A few reviews did mention a couple positives. One said, “I take Slendesta every day but not before every meal. When I do take it it seems I feel full quicker.”
One user reported, “I think it helps a little but if you are expecting the same results that a good lunch or dinner will give you then your expectations are set too high.”
Our research has shown that whenever a negative aspect of a supplement exists, such as lack of clinical research, the likelihood of long-term success is limited. If Slendesta really doesn’t work, this could become concerning.
The Science – “Legit?”
According to the official website, Slendesta is backed by science. The company even presents research. After a bit of digging, we noticed that the studies were limited to a small test group and the participants were required to follow a specific eating plan. This leads us to believe that lifestyle changes could be the cause of weight-loss, not specifically the ingredient. At DietSpotlight we always look for data throughout the review process. But, if results don’t tell the entire story, we become a bit skeptical about it.
The Bottom Line – Does Slendesta Work?
So, considering this one for weight-loss? Well, we like that the makers of have been around for years and Slendesta side effects weren’t mentioned, but the lack of clear research connecting this one to you losing weight is concerning. We’re also a bit hesitant about giving this one the green light due to customer comments about it not producing results.
You want to lose weight, so we suggest going with a supplement containing ingredients shown to promote weight-loss, connected to solid science and supported by positive customer comments.
Among the best products we’ve seen in 2016 is one called Leptigen. This formula contains a four clinically-tested ingredients that have been shown to help promote weight-loss by accelerating metabolism and igniting fat loss. No one’s talking about harmful side effects and dieters are commenting about seeing excellent results.
The makers of Leptigen are currently offering a Special Trial Offer, which is a sign that they’re confident in their supplement.
Previous Slendesta Review (Updated June 13, 2014):
What You Should Know about Slendesta
Slendesta is an appetite suppressant formulated by Kemin Industries. This company was founded in 1961 in Des Moines, Iowa and it is known for making items that are "functional products that deliver maximum efficacy through superior science". Kemin Industries currently markets an extensive catalog of foods, pet foods, nutraceuticals and pharmaceuticals around the world.
Slendesta claims to help suppress your appetite, which will help you lose weight because you will eat smaller portions and skip all those calorie-heavy snacks you might have usually eaten throughout the day. The official Slendesta website claims that most dieters will make up excuses to "cheat on" their diet, and the biggest one is that these dieters are just too hungry all the time. The Slendesta product aims to tackle this specific problem, making it not entirely suitable for all dieter, but incredibly useful within the niche market of "diet cheaters."
List of Slendesta Ingredients
Slendesta contains: Natural potato extract derived from white potatoes.
We can't find any other ingredients listed.
Slendesta is one of the main diet products that Kemin Industries produces. Slendesta is an appetite suppressant that uses potato extract as its main (and, apparently, only) ingredient. Potato extract contains a protein called P12 that is supposed to stimulate the production of a naturally occurring chemical called Cholecystokinin or CCK. CCK is supposed to "trick" your brain into the feeling of being full.
The official website for Slendesta says that there have been numerous clinical studies done on the protein P12 which is the active ingredient in Slendesta. The website claims that these studies, done over 20 week periods, showed that the participants in these studies had visible weight loss over each 4 week visit. There is no data given on where these studies took place or who participated in them, however.
Advantages of Slendesta
- The official Slendesta website goes into great detail about what the main ingredient is and what it does.
- This product contains no stimulants and should produce no side effects in terms of jittieness or blood pressure risks.
Disadvantages of Slendesta
- Slendesta does not contain any well known ingredients, only white potato extract.
- There are no testimonials available on the official website.
- Slendesta doesn't contain a fat burner of any kind.
We like how much information the official Slendesta website has on the main ingredient potato extract. The problem we have with this product is that it is meant to work over a period of almost 6 months and many dieters don't have the motivation to stick with a product that doesn't give them fast results. If you are looking for a long term weight management product, you might consider Slendesta, since it's fairly cheap and all-natural. For those looking to lose weight fast, we highly recommend a product that uses both a fat burner and an appetite suppressant in one dose.
Slendesta Questions & Answers:
We investigated plenty of user comments and customer feedback about Slendesta in order to provide you with this helpful FAQ.
What are the side effects of Slen?
Possible Slendesta side effects, according to some dieters, may include stomach discomfort
What are the ingredients in Slendesta?
The Slendesta ingredient is Potato Protein Extract (Proteinase Inhibitor).
Does Slendesta work?
Slendesta supposedly helps with the release of CCK (cholecystoskinin) in the body; which is a peptide that increases satiety. According to the company website, there have been human clinical studies conducted with Slendesta, and some participants reported that this ingredient did help suppress appetite to encourage weight-loss. There were also participants stating the ingredient didn’t work.
How much does Slen cost?
Slendesta supplements are available from several brands, such as Swanson Health Products ($20.99) and Natrol ($12.99).
How should I take Slendesta?
Typically, Slendesta supplements are taken twice daily, 30 minutes before eating the two largest meals, and with eight ounces of water. A bottle generally lasts for 30 days.
How do I contact the Slendesta customer service department?
You can contact the Slendesta customer service department by calling 1-800-777-8307 or by using the feedback form on the official website.
Can I contact Slen through social media?
Yes, you can contact Slendesta through Twitter.
Can I take Slendesta if I have a health condition?
Those with health conditions, people taking prescription medications, anyone under the age of 18 and women who are pregnant or nursing consult a licensed physician prior to taking any dietary supplement, including Slendesta.
What do users like about Slen?
Some people appreciate that Slendesta is completely natural.
What do users NOT like about Slendesta?
Some users do not like that Slendesta didn’t help suppress their appetite.
Does Slen contain any stimulants?
No, there are no stimulants in Slendesta.
Will Slendesta help boost metabolism
Slendesta does not elevate metabolism or boost thermogenesis.
Do you know of any special deals or discounts on Slendesta?
There are no special deals or discounts on Slen. However, our readers have been going crazy taking advantage of Leptigen’s Special Trial Offer. Click above to learn more.
- 1. Can These Weird Foods Help You Stay Trim? (2013). Women's Health. December 8, 2016.
- 2. Role of cholecystokinin in appetite control and body weight regulation. (2005). NCBI. December 8, 2016.
Slendesta User Tips:
7 Top User Tips
Over the years, we’ve begun to notice that the people using products containing Slendesta have some strong opinions. After analyzing thousands of reviews and comments we have collected some of the best tips to give you some insight into this ingredient.
“I time it so I feel the effects during the times I’m most likely to overeat. It isn’t a take it and forget it for the rest of the day kind of thing.” Kase
“The taste isn’t great. I really had to choke it down.” Amy
“Yep, it’s gritty. I wish it weren’t but I just made it work.” Michelle
“It can take a while for the slendesta hunger control to kick in but I am slowly getting the hang of it.” Emily
“This isn’t a magical solution that will make the weight fall off with no work on your part. You have to exercise and not eat as much too.” Victor
“I follow the instructions exactly. I tried to increase the dosage and it made me nauseous.” Tony
“The first couple of days this made my stomach really unhappy. It got better after a few days though so you have to wait while your body adjusts.” Liv
Slendesta Scientific Abstracts:
Proteinase Inhibitor II (PI2)
The study observed the anti-obesity properties of a potato extract containing 5% proteinase inhibitor II within obese mice. 3 doses of the potato extract (50mg/kg, 150mg/kg or 300mg/kg) were administered by mouth to obese mice once per day for a total of 28 days. Control mice were given distilled water. 4 weeks following potato extract treatment, the alterations in body weight, epididymal fat weight, food consumption, insulin, serum chemistry, fat histopathology, and leptin and adiponectin contents were studied and compared with the treated mice with 750mg/kg conjugate linoleic acid. Potato extract treatment resulted in body weight, epididymal fat, food consumption, histomorphological changes of fat, serum biochemistry, and pancreas were substantially reduced when compared to control mice. These type-2 diabetes-linked changes were substantially suppressed following potato extract treatment for 28 days. In conclusion, it has been suggested that potato extract containing 5% proteinase inhibitor II has the potential to be an alternative therapy for obesity. 
Administration of a protease inhibitor concentrate derived from potato (PPIC) decreased immediate intake of food throughout the first 2 hours following treatment, yielded gastric emptying and reduced proteolytic activity in the duodenum. PPIC taken repeatedly decreased weight gain in male rats and substantially increased plasma cholecystokinin levels. Duodenal mucosal cholecystokinin mRNA levels elevated due to a response to potato concentrate treatment, but the concentrate did not elevate cholecystokinin expression nor did it released in STC-1 cells. There were no adverse effects during the potato extract administration for 14 days (33-266 mg kg (-1) PPIC per day). The discoveries in this study displayed evidence that potato extract, when given orally, is effective in decreasing food intake as well as body weight gain within healthy rats through an increase in circulating cholecystokinin levels via a trypsin-dependant mechanism. 
A proteinase inhibitor’s effect (extracted from potatoes) which raises CCK release, on the amount of food consumed was studied in eleven lean participants. According to a double-blind design, the subjects received 1.5g of the extract within a high-protein soup (70kcal), no soup control, or the soup vehicle by itself for 5 minutes prior to a lunch test meal. Intake of the soup by itself led to an insignificant 3% decrease in energy intake. Adding 1.5g proteinase inhibitor to the soup substantially decreased the energy intake of participants by an additional 17.5%. Ratings during premeal (food preferences and motivation to eat) failed to predict energy intake reduction. The findings of the study indicate that endogenous CCK could be a significant factor in food intake control and that proteinase inhibition could harness beneficial therapeutic effects on the reduction of food intake. 
- 1. Anti-obesity and anti-diabetic effects of a standardized potato extract in ob/ob mice (2016). Experimental and Therapeutic Medicine. November 17, 2016.
- 2. Potato protease inhibitors inhibit food intake and increase circulating cholecystokinin levels by a trypsin-dependent mechanism (2011). International Journal of Obesity. November 17, 2016.
- 3. Oral administration of proteinase inhibitor II from potatoes reduces energy intake in man (1990). Physiology & Behavior. November 17, 2016.
Slendesta Side Effects:
Natural weight-loss supplements don’t guarantee safety. Even the most natural formula has the ability to cause a negative reaction. While Slendesta side effects are mild and rather rare, they exist for some users.
Stomach discomfort may be described as a stomach ache, upset stomach or even nausea. It may come along with vomiting. The pain may be crampy or very dull, but it may also be severe or very sharp.
What causes stomach discomfort?
Stomach discomfort is caused by a number of different health issues. Sometimes, it’s caused by stress or a simple illness. Other times, it’s caused by something more serious, such as a stomach virus, menstrual cramps, food poisoning, gas, ulcers, kidney stones, Crohn’s disease, urinary tract infection, appendicitis or GERD. (1) Stomach discomfort may also come from a reaction to a medication or discomfort. 
When stomach discomfort becomes more serious, it may be classified at nausea. It may become a very sick feeling making you need to sit down or feel like you might faint.
What causes nausea?
Nausea may be caused by a bad odor or a number of the same causes as stomach discomfort. However, nausea may come with vomiting, as well. It may be caused by a hernia, ulcers, pelvic inflammatory disease, food allergies, a stomach illness or prescription medication.
An upset stomach may feel like a sharp pain or a dull pain in the stomach. It may feel like you’re bloated or you may feel sick to your stomach. It’s not serious enough to be classified as nausea, but it’s still an uncomfortable feeling.
What causes upset stomach?
An upset stomach may be caused by something you ate or an illness. It’s often a symptom of the stomach flu. Often, the cause of your upset stomach can be discovered by the time it started.
Also known as flatulence, farting or passing wind, gas is formed in the digestive system and released through the mouth or anus. It may cause feelings of bloating and may be very uncomfortable. However, it’s natural and often doesn’t come with much of an abnormal feeling unless it’s persistent or serious.
What causes gas?
Gas is commonly caused by a food allergy, lactose intolerance, swallowing air, things you eat, an E.coli infection, gallstones, amebiasis, medications and many other things. It’s very common, but it can be a symptom of something more serious. 
Slendesta side effects are not guaranteed, but reports of stomach discomfort, nausea, upset stomach and gas have surfaced from a small number of users. To protect yourself from any health issues, speak with your physician before starting a new supplement, especially if you have a medical condition, take prescription medication, are under 18 or you’re pregnant or nursing.
Slendesta is a branded ingredient, not a standalone supplement. This unique protein is supposed to send out signals to the brain that say - "You're Full!"
Slendesta Ingredients and Supplement Facts
Serving Per Container: N/A
|Amount per Serving||% DV|
|Proteinase Inhibitor II (PI2)||*||*|
Other Ingredients: None
We looked into the Slendesta ingredients in order to give you the information that you really want.
Potato Protein Extract
The scientific name for potato protein extract is potato protein inhibitor 2. It is extracted from white potatoes and can be found in a variety of weight-loss products.
What Is It Supposed to Do?
Typically, potato protein extract is used as an appetite suppressant. Some of the chemicals found in the extract might help the consumer increase their feeling of fullness, which can help aid in weight-loss.
There is one study that was performed on Slendesta, testing the potato protein found in it. According to the results, which were published in Experimental and Therapeutic Medicine , “Thus, SLD (Slendesta potato extract) may be a promising alternative therapeutic agent for the treatment of metabolic syndrome, mediated by an already known mechanism, through the food intake regulatory peptide CCK (cholecystokinin).”  However, issues with those that do not suffer from metabolic syndrome are unknown, which makes it hard to determine the exact weight-loss effects on anyone else.
Another study, published in the International Journal of Obesity: London, stated that, “These findings provided evidence that PPIC (potato protease inhibitor concentrate) is effective in reducing food intake and body weight gain in healthy rats when administered orally.”  Though these findings may be significant, they were not found in humans, and as an ingredient that was not tested in humans, some concerns are inevitable.
We like seeing supplements that are backed by science. That’s why we have our eye one Leptigen. It contains clinically-tested ingredients, which have been shown to work. What to learn more? Click above.
- 1. Anti-obesity and anti-diabetic effects of a standardized potato extract in ob/ob mice (2016). Experimental and Therapeutic Medicine. April 14, 2016.
- 2. Potato protease inhibitors inhibit food intake and increase circulating cholecystokinin levels by a trypsin-dependent mechanism. (2011). International Journal of Obesity. October 4, 2016.