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Home arrow Nutrition arrow Keto Diet arrow Keto OS Review: All the Facts in One Place

Keto OS Review: All the Facts in One Place

Written by Thalia Oosthuizen
Fact checked by Rosmy Barrios, MD
Last update: October 5, 2023
9 min read 1516 Views 0 Reviews
clock 9 eye 1516 comments 0

Keto OS is a supplement for the ketogenic diet that promises a big game. But is it really worth the hype? Read this Keto OS review to find out.

Keto OS review

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Pruvit’s Keto OS is an exogenous ketone supplement promising increased energy levels, enhanced DNA repair, more significant immune function and focus, and improved fat loss. It’s a relatively new supplement that has gained some attention recently, and in this Pruvit Keto OS review, we’re going to take a closer look at everything you need to know about this supplement.

Our Pruvit Keto OS review will provide you with all of the facts. Read on for more.


Pruvit Keto OS aims to be a one-stop solution to exogenous keto supplements. While it does offer some excellent benefits, some pretty nasty side effects and a lack of transparency from the brand make this a problematic product to root for. And, when compared to a product like Keto Cycle FUEL it is wholly outranked in almost every way.

pruvit logo
Our rating:
  • High concentration of ketone salts
  • Mixed with water to create a keto diet supplement
  • Boosts blood ketone levels
  • Various flavors to choose from
Learn More
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    Many flavors mean you can find one that you like
  • checkmark
    Easy to use
  • checkmark
    It contains some potent ingredients
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    Not a lot of research backing some of Pruvit’s claims
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    Could cause diarrhea, bloating, and bad breath
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Comparison Table

Comparison Winner: Keto Cycle FUEL
Keto Cycle FUEL
Pruvit Keto OS


Delicious flavors

Boost of energy

Low-calorie supplement

Increases mental clarity and cognitive function

Lowers blood glucose levels

Offers healthy cell function and DNA repair

Contains some potent ingredients

Boosts ketone levels in the body

Great flavor


Not vegan-friendly

Quite expensive

Not much research backing up some of Pruvit’s claims

Can cause some undesirable side effects

May lead to disordered eating

⭐ Rating


🧪️ Dosage

2 packages per day

💊 How to use

Dissolve the package, drink in the morning and evening before a meal

🍎 Key ingredients

Vitamin B, BHB ketones, C-Med 100

🥦 Vegan?


📱 Where to buy?

What Is Keto OS?

As you may already guess, Keto OS is a keto supplement made by Pruvit, known for its exogenous ketone supplements. The “OS” stands for “Operating System.” This supplement is designed with exogenous ketones to boost your weight and fat loss while practicing the keto diet. OS is designed to be used on the go, with drink packets that can be dissolved in cold water for a quick drink to promote nutritional ketosis.

Keto OS is meant to suppress your appetite, which can help you achieve a state of ketosis. When this happens, your body begins to burn fat to use as fuel, which can reduce your urge to snack and help you lose weight with more effective results. Keto OS is dairy-free, gluten-free, and vegan, which ticks all the boxes for a health-conscious brand like Pruvit.

How Does Pruvit Keto OS Work?

To answer this question, it helps to have a basic understanding of how ketosis works. The ketones produced in your body when you follow the ketogenic diet are known as “endogenous” ketones or ketones produced naturally by the body. So, exogenous ketones are those that come from outside of the body, usually through supplements like Keto OS.

Ketones are compounds that occur naturally in the body and can be used as an alternative energy source. They are released when the body begins to break down fat rather than relying on carbohydrates for energy. When this happens, the body is in a state of ketosis, which is the desired outcome of the ketogenic diet.

Pruvit Keto OS works by providing the body with a surplus level of exogenous ketones through ketone salts to kickstart the body into ketosis without the need to stick to a strict ketogenic diet. However, Keto OS won’t actually put your body into a state of ketosis but will instead support your body in maintaining ketosis while you follow the ketogenic diet.

As an exogenous ketone supplement, Keto OS works best when you’re already following the keto diet and is not meant to be used as an easy way to get your body into ketosis.

Pruvit Keto OS Side Effects and Dangers

The side effects that Pruvit Keto OS might cause are much the same as those you might experience when you first start the ketogenic diet, at least according to Pruvit themselves. Just like your first few days on the ketogenic diet, Keto OS (and Keto OS NAT) can have a diuretic effect that might lead to mineral and water depletion in your body. This isn’t the case for all ketone supplements, but it is for some, so we’re mentioning it here.

Here are some of the side effects you should expect when starting Keto OS and other ketone supplements.

  • Bad breath During the first week or so of the ketogenic diet, your body will create high volumes of acetone, which is one of the primary ketone bodies that help you lose weight when on the keto diet. When there is enough acetone present in the body, it can be exhaled with each breath, which could cause your breath to be a little smelly.
  • Digestive problems An upset stomach is one of the most common side effects that can occur when on the ketogenic diet or when taking any kind of exogenous ketone supplements. This can include stomach pain, diarrhea, and gas, though those are usually the worst symptoms.
  • Could cause an onset of disordered eating While Pruvit Keto OS aims to promote a healthy low-carb diet or ketogenic diet, it seems that their educational and promotional materials glamorize the idea of a “keto quick fix” and a magical solution for losing weight.

None of these claims are supported by any legitimate, concrete evidence, so buying into their supplements can provoke the same disordered eating we strive to avoid when going low-carb. Having good blood ketone levels does not require extreme dietary restrictions or supplements.

  • Could cause hypoglycemia Hypoglycemia is a deficiency of glucose levels in the blood and can be caused by introducing exogenous ketone supplements into your diet. Exogenous ketones can reduce blood sugar levels, so if you have diabetes, you should definitely consult your doctor before you start taking any kind of ketone salts to lose weight.

Pruvit Keto and diarrhea

As mentioned previously, the Keto Operating System – or any kind of exogenous ketones for that matter – can cause an onset of diarrhea. Your body can react in unexpected ways when you make a sudden change to your diet or add supplements, and it’s perfectly normal to notice some changes in your digestion when this happens.

Ketone supplements and the ketogenic diet are not the only causes of this – with any dietary change, you might experience either diarrhea or constipation at first. It wouldn’t be an accurate or fair Pruvit Keto OS review if we didn’t mention this potential side effect, so definitely be on the lookout for any changes in your bowel movements once you start this supplement.

What Are the Ingredients of Pruvit Keto OS?

You should be aware of a few key ingredients present in Pruvit Keto OS. Let’s cover them in more detail.

#1 Vitamins B6 and B12

The inclusion of B6 and B12 vitamins from the B-complex makes for quite a potent concoction, primarily when used in exogenous ketone supplements like Keto OS. Vitamin B6, also called pyridoxine, is responsible for red blood cell production, amino acid metabolism, and the development of neurotransmitters. You’ll find this vitamin in chickpeas, potatoes, and salmon.

B12, probably the most well-known vitamin in the B vitamin complex, is vital for DNA production, neurological function, and red blood cell development. You’ll find B12 naturally occurring in animal sources, such as meats, seafood, eggs, and dairy.

#2 Beta-hydroxybutyrate (BHB)

As with most other exogenous ketones, the main active ingredient found in Keto OS and Keto OS NAT is beta-hydroxybutyrate salts, also called BHB salts. They are usually incorporated into ketone salts like the Ketone Operating System to help put the body into ketosis, to increase fat burning and weight loss. 

The keto lifestyle is specially designed to improve weight loss and help you achieve your ideal body weight through improved ketone levels, so it makes sense to see BHB as an exogenous ketone like Keto OS.

#3 C-Med 100

C-Med 100 is simply Pruvit’s branded version of an ingredient known as Cat’s Claw, often found in exogenous ketones. This ingredient is rich in antioxidants, and evidence suggests that it is beneficial for reducing inflammation.

However, there isn’t much evidence that suggests that C-Med 100 is specifically beneficial for weight loss or ketosis, so we can’t say for sure that its inclusion in Keto OS is beneficial for your keto diet.

#4 Fermented L-leucine

This is quite an obscure ingredient, and you wouldn’t be wrong for not knowing what it is. L-leucine is one of the essential amino acids known for its powerful muscle building and protein synthesis capabilities when ingested.

You can use it to preserve lean muscle, and its fermented version is often sourced from vegetables. It is mainly used for muscle building, so it feels a little out of place in the Keto OS ingredient list since the product is meant to increase exogenous ketones in the body.

How to Choose

Choosing the suitable exogenous ketones for your body is no small task, and when it comes to products like Keto OS and Keto OS NAT, there are a few things you’re going to want to keep in mind. Let’s cover them in more detail.


One of the first things you’ll want to do is look at precisely what a manufacturer is using to make their products. While it’s all well and good to look at the ingredients on a product like Keto OS, doing a little more research on the ingredients you aren’t familiar with will help you understand exactly what you’re putting in your body.

Side effects

As we’ve already mentioned, Pruvit’s Keto OS comes with a few side effects your body might experience when you first start taking the supplements. These side effects are not exclusive to Pruvit and can occur with many other exogenous ketones. We’ll always list the side effects of dietary supplements so that you’re never caught off guard.

Looking at the claims

Sometimes, you will have to ask yourself, “does this product really work?” Companies will often promote their product in such a way as to intentionally confuse or mislead you, so you’re going to want to check if these claims are in line with what the product does. We do all the investigating for you.

Keto Cycle FUEL gets it right in this department. The company provides you with plenty of evidence and educational resources to back up its claims, and we appreciate that they’re not trying to withhold any information from you. 

A Word From Our RD

It’s important to remember that most exogenous ketone supplements, if not all of them, are not designed as a quick-fix way to get your body into ketosis but rather as a way for you to boost your ketone levels and weight loss progress while you’re already following the diet. This is extremely important to keep in mind when shopping for exogenous ketone supplements.

One should use an exogenous ketone drink in conjunction with at least a semi-strict keto diet for optimal ketone production and health benefits. Burning fat and achieving your fat loss goals becomes much more doable when following the best practices.

And remember, losing weight isn’t everything. You shouldn’t be following the ketogenic diet because you’re trying to lose as much weight as possible. Instead, you should use it to improve your overall health.


Are Pruvit Keto OS supplements safe?

As we’ve mentioned before, taking Pruvit OS may cause several mild side effects, which could become more detrimental to your health if not taken seriously. Be sure to talk with your doctor before you take any ketone bodies.

How much does Pruvit Keto OS cost?

Pruvit recommends that you take two servings of Keto OS daily for optimal performance. If you were to follow this recommendation, you’d be paying about $182 for your Keto OS every two weeks – that’s a lot of money.

Can ketones raise blood pressure?

While the ketogenic has been known to raise blood pressure, various studies have proven that a high-fat diet and elevated blood ketone levels do not cause hypertension.

Where can I buy a ketone drink?

You can find keto supplements in many prominent chemists and drug stores and through manufacturer websites.

Wrapping Up

It seems that Keto OS and Keto OS NAT might be the next best keto supplement, but there are a few downsides to taking this drink that might be off-putting to some.

If you’re looking for a genuinely excellent ketogenic diet supplement, consider Keto Cycle FUEL, which is specially designed to boost your endogenous ketones and promote healthy weight loss.

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Written by Thalia Oosthuizen
Fact checked by Rosmy Barrios, MD
Last update: October 5, 2023
9 min read 1516 Views 0 Reviews
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