One of the most popular weight loss programs in a long time is the ketogenic diet. It's so popular that there are now ketogenic supplements. One such supplement is called Keto OS made by a company called Pruvit. I've seen ads for this stuff popping up so many times that I decided to review it. Does Keto OS work and what evidence does it have? Does it really work? Are there any side effects? Is it a scam? These will be the main focus points of this review. Along the way I also want to touch on other questions too. Let's see if Keto OS is right for you.
What Are Ketones?
Ketones (also called ketone bodies) are acid-like molecules formed naturally in the body during the breakdown of fat. We make more ketones when:
- There isn’t a lot of food to eat
- We eat a low carb diet
- During long duration exercise
- Diabetics can’t control their blood sugar levels.
While we make ketones in small amounts all the time, when the levels go above normal, it's called ketosis.
What Is A Ketogenic Diet?
The suffix Keto refers to “ketones” and genic refers to “the production of.” Therefore The ketogenic diet is an eating program that causes the body to increase its production in ketones.
Ketogenic diets usually consist of eating lots of fat and very little carbs. Short term studies have documented ketogenic diets can reduce hunger. Other studies have shown weight loss too. While interesting, at least one study has noted that ketogenic diets are no more effective than other weight loss eating plans.
Ketogenic Diet Benefits
The popularity of keto supplements makes sense given research suggesting the ketogenic diet might :
And many other things. Remember though that evidence for the keto-diet is not necessarily evidence for ketone supplements.
What Are Ketone Supplements?
Ketogenic supplements (like Pruvit Keto OS) contain ingredients said to put people into ketosis without actually eating a ketogenic diet. We will discuss what those ingredients are below. For more info on ketosis see the review from Dr. Bill Sukala's website.
In this review, I want to look directly at the Keto OS supplement. This review will focus on three main questions:
- Does Pruvit Keto OS have any proof it raises ketone levels?
- Does Pruvit Keto OS have any proof it helps weight loss?
- What are the ingredients in Pruvit Keto OS?
These are, after all, that's what most people are interested in.
What Is Keto OS?
Keto OS is a dietary supplement that is supposed to put people into ketosis. It's made by a supplement company called Pruvit. It's not the keto OS diet but rather a diet supplement.
Research suggests that ketogenic diets can lead to weight loss. So, the idea is that ketogenic supplements – like Keto OS -will raise ketone levels without people eating a low carb diet/high fat. This is said to artificially raise ketone levels, which in turn promote weight loss.
What Does Keto OS Mean?
The name Keto OS is short for “Ketone Operating System.” It’s a slick-sounding name that I guess is supposed to impress on people that the ingredients help the metabolic ketone operating system of the body work better.
This is semi analogous to the operating system of a computer (widows/IOS/Android etc.) which helps machines do things.
The goal with keto supplements is to make the “ketone operating system”, make more ketones. But is there any proof for it? That's what the rest of this review will try to determine.
Keto OS Benefits
From the product website, Keto OS is said to improve the following:
- Fat loss
It should be noted though none of these benefits are guaranteed. Those going to the product website will notice the sentence “what Keto OS may do for you” where the important word in the sentence is “may.”
This is likely because if they said it “would” do these things, it might spark the ire of the FDA which frowns on companies making specific claims about supplements.
Pruvit Keto OS Research
Does Keto OS have any clinical proof it raises ketone levels? Evidence appears to be lacking. There is no mention of evidence/proof on the Keto OS website.
Likewise, searching other clinical websites reveals no research either.
So, it appears for now, that Keto-OS -itself – has no published, peer reviewed evidence showing it raises ketone levels. So, to know if it really works or not, we'll need to look at the research on the ingredients.
Let’s do that now.
Pruvit Keto OS Ingredients
According to the Supplement Facts label, 1 scoop (22.3 g) of Keto OS has 110 calories and the following nutrition information:
While this is a big table, there are a couple of things worth pointing out:
I noticed 2 typos in the Supplement Facts label:
- 1 gram of protein is not 59% of the daily value for protein.
- 3 grams of total carbs is not 34% of the daily value for carbs.
Typos are understandable from time to time and I make my share of them too.
A few other items are as follows:
- Provit Keto OS is considered high in saturated fat according to the FDA. Per FDA guidelines, anything with more than 20% of daily value is considered “high.”
- Keto OS is high in sodium with each scoop providing 1.4 grams. This is 59% of the daily value for sodium.
None vitamins or minerals in Keto OS play roles in ketone production so I won't address them.
Keto OS Active Ingredients
The secret sauce in Keto OS is found in the ingredients which are listed below the Supplement Facts label.
Each Keto OS packet (22.7 g) contain the following ingredients:
- Beta Hydroxybutyrate (amount not given)
- MCT Powder (amount not given)
- Natural Flavor
- Malic Acid
- Caffeine (amount not given)
- Ascorbic Acid
Of all these ingredients, it’s the first 2 on the list (and really the just ingredient #1) that are most important. Those ingredients are:
- Beta Hydroxybutyrate
- MCT Powder
These 2 ingredients are the key ingredients in Keto OS supplements.
Let’s now look at the research on each of these compounds.
Beta HydroxyButyrate is also called BHB or hydroxbuteric acid. It makes sense that BHB would be in a ketone supplement because that’s exactly what BHB is: BHB is a ketone.
When BHB is taken as a supplement, it’s called an “exogenous ketone” Naturally made BHB are called endogenous ketones.
Many websites discuss how DARPA (Defense Advanced Research Projects Agency) – the US government agency tasked with developing new technologies for national security – has tested ketone drinks see if they improved military performance. While this is a nice claim to fame, I'm not sure if the US military uses ketone drinks or not.
Does Exogenous BHB Raise Ketone levels?
It probably does. At least one lab rat study has shown BHB supplements raise BHB levels in the blood. This study lasted 28 days. The rats received between 5000 mg and 10000 mg per kilogram of body weight BHB.
Since rats and people are not the same, we need to do some math to find equivalent dosages. Converting to people dosages, the amount is 806 mg/kg to 1600 mg/kg.
A small human study (15 people) has also shown that a ketone drink, providing 12-24 grams of BHB, was successful at raising blood BHB levels.
How much BHB is in Provit Keto OS? I can't say as the amount is not listed.
See the Thrive DFT DUO weight loss patch review has more on BHB.
Medium Chain Triglycerides (MCTs) have been around a long time. Research has shown MCTs can raise BHB levels in people with dementia. Given MCTs also raise BHB levels, it makes sense they would be present in ketosis supplements.
Researchers in 2015 analyzed 13 different studies of MCTs and weight loss. They concluded while it was possible MCTs may aid weight reduction, they also noted many studies had problems. In other words, more research is needed.
Because MCTs raise BHB levels, it's a logical choice for a ketogenic supplement.
Keto Supplements And Weight Loss
At the time this review was created, evidence linking exogenous ketogenic supplements to weight loss were lacking. This section will be updated as research becomes available.
Who Makes Keto OS?
The company is called Pruvit (“Prove it”) also known as Pruvit Ventures, Inc. The company website is PruvitNow.com.
The Pruvit company is located at 901 Sam Rayburn Highway Melissa, Texas 75454. The CEO of Pruvit is Brian Underwood. Other ventures Mr. Underwood has been involved with include a social media sharing app called Rippln, a social app sharing platform, as well as a text message marketing app called Izigg.
At the time this review was crated the Better Business Bureau gave Pruvit Ventures had a rating of “F.” See the BBB file for updates and more information.
As an aside, at the time this review was created, Pruvit held 41 trademarks on a variety of words and phrases such as:
While I understand a company protecting itself, to be honest, I’m not sure how I feel about trademarking commonly used words and phrases like “food for thought” or “hacked.” That's my opinion. Take it for what it is.
How To Contact Pruvit
When this review was created, no contact phone number was listed on the The Pruvit website. An email address is provided for those with questions: email@example.com. The company is also active on facebook, twitter and Instagram. If you ordered Keto OS through a promoter, they should be able to help you too if you have questions.
How Much Does Pruvit Keto OS Cost?
I found the price of Pruvit Keto OS supplements a bit confusing. The order form on the site has 3 options:
- “smart-ship” which I believe is an auto ship program
- “Today only” which probably refers to one time only orders
- “Today and smartship” I'm not sure what this means
That said, if we look only at the “today” option (and remove the autoship) here are the prices I saw:
- Keto OS Max (raspberry lemonade) 20 servings $130
- Keto Kreme FFT 20 servings: $82
- Keto OS Max (Swiss cacao) 20 servings $130
- Keto OS Max (Maui Punch) 20 servings $130
- Keto OS 3.0 (chocolate swirl) 30 servings $144
- Keto OS 2.1 (orange dream) 30 servings $160
There is also a “Family Pack” for $408 which contains:
- 30 x 2.1 Orange Dream Charged
30 x 2.1 Orange Dream Caffeine Free (“uncharged”)
30 x 3.0 Chocolate Swirl Charged
The “Charged” (caffeine added) version prices are the same as “uncharged” (decaffeinated) versions. Any way you slice it, Keto OS is expensive.
Pruvit Keto OS Guarantee
Keto OS supplements do come with a guarantee: This is what it says on the Pruvit website:
“If within the first 30 days of the original purchase, you are not satisfied with the product you may contact firstname.lastname@example.org to return the unused portion of the product for a full refund of the product purchase amount, minus shipping and handling charges incurred.
After 30 days and up to 90 days post purchase, you may contact email@example.com to return the remaining sellable portion of the product for a full refund on the returned items, minus shipping and handling charges incurred.”
This seems reasonable. One thing to take note of is the 30 day guarantee starts WHEN YOU PURCHASE the supplements – not when they arrived.
Keto OS Side Effects
While Keto OS is likely safe in healthy people for at least short periods of time, long term effects are not known until research is published. Here are a few things to consider. This list is not complete:
- Fluid loss may occur especially in those who combined keto supplements with a ketogenic diet. The fluid loss comes from the breakdown of glycogen (carbohydrates stored in the muscles). This loss of fluid might also lead to a loss of minerals such as sodium, potassium, magnesium, etc. The loss of sodium is why Pruvit says they add sodium to their supplements.
- The “Atkins Flu” is a self-described set of symptoms sometimes reported by those who go on a low carb diet. Signs if this can include irritability, fatigue and headaches to name a few. Whether or not this “flu” occurs when someone takes nutritional keto supplements, is unknown. The Atkins Flu is not a formal diagnosis. Rather, it's just anecdotal reports. Take it as such.
A short list of those who should seek medical advice before trying exogenous ketogenic supplements include those with:
- kidney problems
- liver problems
- heart disease
- high blood pressure
- high cholesterol / triglyceride levels
- Until more is known, avoid keto supplements while pregnant or breast feeding.
- Stop taking ketogenic supplements at least 2 weeks before having surgery.
To be safe, those with medical issues should speak to their doctor, dietitian and/or pharmacist before using ketogenic diets or keto supplements.
Best Way to Measure Ketone levels?
The only way to know for sure if Keto OS is really raising ketones in the body is to test yourself. There are 3 different ways to test your ketone levels:
- Breath test
- Urine test
- Blood test
Of these, testing ketone levels in the blood is usually seen as the best test.
There are several blood ketone meters out there. I'm not sure which one is best. One problem with blood testing devices is they may not be able to tell the difference between D-BHB and L-BHB. Generally, D-BHB is what you want to test for.
How Long do ketones Stay Elevated?
How long do blood ketone levels stay elevated after taking a Keto OS? Is it 20 minutes? An hour or several hours? I do not know. This is something which will take more research.
Do Raspberry Ketones Help Ketosis?
Raspberry ketones give raspberries their unique smell. They are also a popular weight loss supplement. But they will not put people into ketosis. They are not ketones and not keto supplements. As such, they have no place in a ketogenic diet or in keto supplements.
Despite their popularity, weigh loss proof for raspberry ketones is not as strong as most think.
Keto OS Questions And Answers
Does Keto OS Have Caffeine?
Some versions of Keto OS have caffeine. The caffeinated versions are called “charged.” While the exact amount of caffeine is not stated, the Pruvit says it's similar to a cup of coffee. As such we can estimate the caffeine to be around 80-120 mg.
There are also non-caffeine versions of Keto OS. These versions are called “uncharged.” The caffeine in Pruvit comes from Caffeine Hydrous.
Why Does Keto OS Have Caffeine?
Some evidence suggests caffeine can stimulate ketone production in humans. Since Keto OS doesn’t have a lot of caffeine, it's hard to know if it would have any significant ketogenic effects.
Caffeine is might also help counteract fatigue that may accompany a ketogenic lifestyle . This is my speculation of course. Non-caffeine versions of Keto OS are also available.
Does Keto OS Affect Kidneys?
I found a Pruvit article which addresses this question. They say “There is no reason that the ketones produced by the product will affect the kidneys or liver any differently than ketones produced from exogenous fats.”
While this is probably true in healthy people, I’d still like to see safety studies in humans to know for sure.
How Does Keto OS Taste?
I did not taste Keto OS but I saw several people online saying it tasted bad. Others have told me you have to get used to the taste and some have said it tasted better than other keto supplements. Taste is so individual that, as with everything, the only way to know is to try it for yourself.
Why Does Keto OS Contain Sodium?
It's said the reason Keto OS has added sodium is to replace the sodium lost in the urine as someone becomes ketogenic. Keto OS supplements are quite high in sodium. The Nutrition Facts labels reveal a packet may contain 39% to 59% of the daily value for sodium deepening on which product you used. The sodium may be a problem for those with heart disease, or blood pressure / kidney problems.
Do You Need To Increase Salt Consumption?
The Pruvit website mentions it's necessary to increase sodium because being in ketosis will cause sodium loss from the body. Given that most Americans already eat too much sodium, whether or not this is really needed or not requires more study. Take it with a gran of salt.
Is Keto OS Doctor Approved?
The Pruvit website does say it's “doctor approved” but this doesn’t mean much unless we know how many doctors approve of the supplement. In other words, was it just one doctor or most of the American Medical Association? Also, what kind of doctor are we talking about – an MD, a PhD, a chiropractor, a doctor of physical therapy or a naturopathic doctor?
Why Do They Call It “Therapeutic Ketones?”
Raising the level of ketones in the body has been shown to help some medical conditions such as epilepsy. Since it’s a safe bet most people are not using Ketosis supplements for medical conditions, calling them “therapeutic” is over-reaching in my opinion. It's just good marketing. The phrase Pure Therapeutic Ketones is trademarked by Pruvit.
Is Keto OS Gluten Free?
Yes it is. The supplement contains no gluten.
Is it Dairy Free?
Some versions are. The 3.0 Chocolate Swirl and Max Maui Punch versions are dairy free. The other versions of the Keto OS contain a small amount of dairy (2g-3g).
Is it Vegan?
Some versions are. Both the 3.0 Chocolate Swirl and Max Maui Punch are vegan. The other Pruvit supplements are not.
Can kids Use Keto OS?
While the Pruvit website says yes, I’ll respectfully disagree with them on this. This is mostly because of a lack research on kids. While the website does say the serving size for kids would have to be adjusted according the child’s age and body weight, Pruvit gives no guidelines on what these adjustments would look like. Speak to a dietitian, pharmacist or doctor before giving kids keto supplements.
Where To Buy Keto OS?
While Keto OS supplements are not yet sold in stores like GNC, Walmart, Walgreens or CVS, they can be purchased directly from Pruvit Promoters. So if you know a promoter, ask her/him.
Keto OS can also be found at:
What I liked / Didn’t Like
Here’s a quick rundown of what I liked and didn’t like about Pruvit Keto OS
|Shake||Protein||Calories||Product On Amazon|
|Bode Shake||16||200||Bode Shake|
|Isagenix Isalean shake||24||240||IsaLean Shake|
|P90X Recovery Drink||10||220||P90x Recovery Drink|
|Herbalife Formula 1 Shake||9||90||Formula 1 Shake|
|Body By Vi shake||12||90||Body By Vi Shake|
|Right Size Smoothie||7 g||100||Right Size Smoothie|
|Ensure Muscle Health||13||250||Ensure Muscle Health|
|Muscle Milk||16||150||Muscle Milk|
Remember, these are based on my opinion. Take them for what they are.
What's The Best Keto Supplement?
There are many ketogenic supplements, of which, Pruvit Keto OS is one of most popular. Just a few of the others out there include:
- Insta ketones
- Keto Bomb
How does Pruvit Keto compare to other supplements? That can't be known until head-to-head comparisons are conducted by researchers.
If you are tying to decide which is Keto Brand is best, you need to remember that ALL of them should contain beta hydroxybetabuterate (BHB). BHB is the key ingredient. If you don't see BHB as the first ingredient listed on the label, skip it.
Also take notice of the amount of BHB in the product and compare that to the amounts I highlighted above.
Keto OS vs. Instaketones
Instaketones is another popular supplement. How does it compare to Keto OS? Well, they both have the same main ingredient – BHB. The label for Instataketones tells us that each scoop (18.9g) provides 11.7 grams of BHB. As for Keto OS, they dont directly tell us how much BHB it contains although it is the first ingredient listed so it likely makes up most of the proprietary blend.
Instaketones also tells us each scoop has 100 mg of caffeine. While Keto OS also has caffeine, its label doesn't specially tell us how much it has.
While my hunch is the amount of BHB is probably similar in both products, I can understand how the lack transparency in the Keto OS label might make some pick InstaKetones.
Keto OS vs. Garcina Cambogia
Garcinia cambogia is not a ketogenic supplement. I'm not a fan of garcina cambogia for weight loss. I don’t think the research is as strong as some say and it’s connection to liver failure puts it on my “avoid” list.
Does Pruvit Keto OS Work?
If by “work” we mean “does Pruvit Keto OS help people lose weight,” I have my doubts. While I am pretty sure BHB-containing supplements like Keto OS will raise blood levels of ketones, that doesn't necessarily mean they will work the same way as a ketogenic diet. So, should you try Keto OS? That is up to you. If you do, let me know what happened.