Created by Prüvit, KETO OS, which stands for Ketone Operating System, is a “revolutionary drink mix based on a proprietary ketone energy technology. It delivers advanced macro nutritionals and promotes optimized cellular regeneration, energy and longevity.” 
Also known as the keto diet, KETO OS is a line of supplements that promise to turbocharge your metabolism and send your body into ketosis without resorting to the draconian no-carb, all-fat diet.
Known for centuries, it wasn’t until a hundred years ago that ketones (Beta-hydroxybutyrate) were used to treat seizures in kids with epilepsy. A “neuroprotective effect” was produced, which calms the nervous system. Soon researchers were exploring an expanded use of ketones to help with mental, emotional and cognitive health, according to Prüvit spokesperson Andra “Dr. Andy” Campitelli , a naturopathic doctor. She says ketone use was expanded as a tool to enhance athletic performance. Ketones result when the body burns fat for fuel. 
There are two Prüvit profiles on the Better Business Bureau site, one in Indiana and one in Texas. Both sell Prüvit products, but have no website link. The Texas profile has an F rating, mostly for lack of response to customer complaints about return issues. The Indiana profile has an A rating, but no reviews or complaints, and it’s only been open a year. Neither profile lists the CEO the same as the website. There is no phone contact on either the Prüvit website or the Texas BBB profile, only an “Ask a Question” form that goes via email. The Indiana profile does have a phone number: (812) 631-4282.   
KETO OS Claims
So Prüvit claims KETO OS supplementation helps shed fat, build a better body by boosting metabolism, give you more energy and strength, helps with focus, concentration and mental clarity and helps improve mood. On the website home page the first claim is “better fat loss.” Interesting, since very clearly among other admissions in its disclaimer, Prüvit says KETO OS is “not a weight loss product,” on its KetoU FAQ video. 
And they still say any weight loss one might experience is dependent on diet and exercise. There you have it. What every good doctor, nutritionist and dietician will tell you: eat healthy foods and exercise.
That’s the weight loss secret. So is KETO OS a weight loss product or not?
It’s not a news flash that cutting simple, bad-for-us carbohydrates from our diet can lead to weight loss. But the problem for anyone who has tried a restrictive diet plan—like one where carbs are all but eliminated—is it’s very difficult to stick with.
When you eliminate carbs dramatically and suddenly, your body goes into ketosis; there is not enough glucose for fuel, so your fat is burned and ketones are built up. For some people there are side effects like fatigue and headaches; for others, none. While in nutritional ketosis, especially with exercise, you lose fat, blood sugar is reduced, good cholesterol goes up and bad cholesterol goes down—all of which are great for reducing the risk of heart disease.
But KETO OS says go further. Since the process of getting to that ketosis sweet spot can take weeks for most, with exogenous ketones—which you eat or drink—blood ketone levels are elevated right away without the extreme diet restriction needed for a natural ketosis that comes from a gradual but major shift in what you eat. The supplement ketones remain in the body, they say, from 3 to 6 hours. Water soluble, they will not be stored or converted to fat.
Note that all the claims made about KETO OS on the website make sure the use the words may, might, and suggests when discussing the research Prüvit says shows how exogenous ketones act as neuroprotectors that help cognition, increase energy, focus and concentration, regulate blood sugar, and—for the purposes of this review concerned especially with weight loss—“exogenous ketones change body composition.” 
And while they say you don’t have to change your diet—let the sugar and the ketones battle it out—even those who don’t change a thing will still experience the benefits, although Prüvit recommends that people follow a low-carb diet and exercise daily while taking their supplements. So it seems that unless you’re already close to an acceptable and healthy weight, with near to or normal body fat, just adding the supplement alone won’t cut that fat. You have to put in the work. There is no specific meal plan per se; rather Prüvit suggests one follow a low-carb diet, albeit one that’s not too restrictive. But KETO OS does have a cool recipe kit to help make their ketone drinks better—yummy keto smoothies. 
The side effects of exogenous ketones from KETO OS products are many. The company admits that “often” people have “digestive upset,” and that use of their product “can be a little bit dehydrating,” which leads to mineral loss, which equals fatigue, headache, diarrhea and constipation. The suggestion is to just drink more water to stay hydrated and replace lost electrolytes with “a bone broth or miso soup.”  Hmm.
The products, at 30 servings each:
- KETO OS Max – Swiss Cacao at $130
- KETO OS Max – Maui Punch at $130
- KETO OS 3.0 Chocolate Swirl at $85
- KETO OS 2.1 Orange Dream at $85
- KETO KREME at $74. 
KETO OS Ingredients
The primary ingredients in KETO OS drinks—besides cocoa, caffeine, stevia and sugar alcohols—is beta hydroxybutyrate, which “puts ketones in your blood.” Mayo Clinic medical laboratory scientists describe beta hydroxybutyrate as being the greatest of the three ketones found in the blood and is present during “carbohydrate deprivation.” 
L-Taurine is another ingredient which is not uncommon in other weight loss or dietary supplements. It’s an amino acid found naturally in meat and fish that regulates mineral and water levels in our blood. It’s said to improve athletic performance, but side effects and long-term use need further study. 
The chocolate swirl drink also includes an amino acid blend of taurine, tyrosine, arginine, and leucine. Of these, the one that’s a proceed with caution is tyrosine, which is best used for people in extreme stress situations where one is seriously sleep-deprived—it’s used in the military and for astronauts, for example.
An aside about the caffeine. Each serving has the equivalent of one cup of coffee, it’s claimed. That said, some KETO OS products can be ordered “charged”—meaning with caffeine—or caffeine-free.
The Science (or Lack Thereof) Behind KETO OS
Ketogenic diet studies have definitively demonstrated the indisputable short- and long-term benefits for overweight or obese people, especially those with high glucose and cholesterol levels. In a study published in the Fall 2004 Experimental & Clinical Cardiology journal, 83 obese subjects were fed a very low-carb, high-fat and -protein diet for 24 weeks—a ketogenic diet. After the study was completed, subject weight and body mass, bad cholesterol, and blood sugar “decreased significantly.” The study “shows the beneficial effects of a long-term ketogenic diet.” 
Again, for many folks who are familiar with the diet merry-go-round, you’ve probably been on a ketogenic diet (think Atkins) at one time or another—but as is often the case with any diet, it’s hard to stay with it. It’s for that reason ketone aficionados say adding exogenous ketones is the way to go.
So what do nutrition and medical journals say about ketone supplements? From a study published in the 2016 Nutrition & Metabolism(London):
Our research demonstrates that several forms of dietary ketone supplementation can effectively elevate blood ketone levels and achieve therapeutic nutritional ketosis without the need for dietary carbohydrate restriction. We also demonstrated that ketosis achieved with exogenous ketone supplementation can reduce blood glucose, and this is inversely associated with the blood ketone levels. Although preliminary results are encouraging, further studies are needed to determine if oral ketone supplementation can produce the same therapeutic benefits as the classic ketogenic diet. 
That’s encouraging for ketone supplement manufacturers and users.
Word on the Street About KETO OS
Visit Prüvit’s website to see keto before-and-after images, which are always fun to check out.  But I am always dubious of reviews about a product on that product’s website. So I went to Amazon.com, since you can purchase KETO OS products there.
Reviewer “GM Bennett” (2016, 5 stars) says, “So glad I can buy this here in a pinch. I can not live without my KETO OS Chocolate is divine and helps me stay on track for my ketosis. Have lost 45 lbs with the help of KETO OS.” 
“Kara Day” (2017, 1 star)—not a fan—says, “I’ve been on this for over 30 days and haven’t lost anything. I was really looking to lose around 10-16lbs and nothing. Not impressed because it is very pricey.” 
Reviewer “Jennifer M. Snow” (2016, 5 stars) did not like the taste, but did like the product. “This stuff has a weird, almost chemical bitter aftertaste that makes it really unpleasant to drink. I haven’t found anything that will really cover it up. However, it works as advertised, boosting energy.” 
“Ms. A” (2016, 1 star) says, it “does not work.”
Your test strip indicates you’re in ketosis only after consuming a glass of the product. I am very familiar with getting and keeping my body in ketosis from previously doing the Atkins diet. I strictly followed the KETO program for 2 weeks and was never able to achieve ketosis “naturally.” The product does not work. Follow the Atkins diet if you want to achieve ketosis. 
The Bottom Line: Is KETO OS Worth a Try?
Depends. Go for it—if you can afford it, because the KETO OS supplements are not cheap. My feeling is it’s smarter, safer and cheaper to get to ketosis naturally through nutrition, by cutting the sugar that’s found in nearly all processed foods—the dreaded and deadly high-fructose corn syrup, for one, is in everything. Check the labels in your pantry. And when you’re shopping—you can avoid high-fructose corn syrup, but it’ll take some digging.
So, cut the processed foods out, limit simple carbs, also known as white stuff—soda, candy, sugar, white bread, white rice, white pasta, potatoes (except sweet potatoes), desserts, pastries. Instead eat oatmeal, whole wheat pasta and bread, brown rice, black beans, lentils, chickpeas, peas, barley, bananas (freeze them then blend for banana “ice cream”), apples, cherries, spinach…you get the idea. These are all perfect carbs for our bodies and will not only do the body good, you’ll lose weight eating them instead of those fries, nachos, doughnuts, and Little Debbie’s. And there are scads of keto-friendly (low-carb) recipes out there on the Net for the occasional sweet treats that won’t send you back into sugar-shock.
Yes, your body will crave this crap for a little while, but you won’t end up with the myriad side effects that come with ketone supplements. Plus, you’ll save a lot of money so you can put up that basketball hoop you’ve been thinking about.
Top 5 Diets Compared*
6 Month MBG
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*Individual results will vary.
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