KETO//OS NAT offers pure, therapeutic ketone supplements to support the essential functions of your body, including immunity, DNA repair, and cellular renewal.

Known for its patented Nutritionally Advanced Technology, this product can help jumpstart your ketosis journey, rather than you having to spend weeks “biohacking” your way into it.

Offering a quick and safe way to reach and maintain ketosis without requiring you to follow a strict ketone diet, KETO//OS NAT is garnering tons of attention.

The product was created by the brand Pruvit, which was founded in 2015 by Brian Underwood. His vision was to build a lifestyle brand that would shatter the norm by combining technology, education, and community. With headquarters located in Melissa, Texas, Pruvit has set out to make its vision a reality by creating the best ketone supplement drink, KETO//OS.

Focused on creating products that are based on research and produce real, tangible results, Pruvit’s philosophy is a simple one: Make. People. Better.

Ready to kick-start your way into ketosis? I recommend that you first take a look at my KETO OS//NAT review, which will go over their best-selling products, ingredients, benefits, side effects, customer reviews, promotions, and more to help you decide if it’s worth your money. I’ll kick it off by looking at their pros and cons.

Pros and Cons


KETO//OS NAT is a type of exogenous ketone supplement designed to increase the level of ketones in the body and help with weight loss, energy, and mental clarity. Here are some potential pros and cons of using KETO//OS NAT:


  1. Increases ketone levels: A study published in the Journal of Physiology found that exogenous ketones, such as those found in KETO//OS NAT, can increase blood ketone levels.
  2. Can help with weight loss: A study published in the Journal of Nutrition and Metabolism found that exogenous ketones can increase fat burning and reduce hunger, which can aid in weight loss efforts.
  3. May improve cognitive function: A study published in the Journal of Alzheimer’s Disease found that ketone supplementation may improve cognitive function in patients with mild cognitive impairment.


  1. Expensive: The price of KETO//OS NAT can vary depending on the specific product and size, but it is generally more expensive than other exogenous ketone supplements on the market.
  2. May cause digestive issues: A study published in the journal Frontiers in Physiology found that some people may experience gastrointestinal distress when taking exogenous ketones, including KETO//OS NAT.
  3. Not a substitute for a healthy diet: While KETO//OS NAT can provide some benefits, it is important to note that it is not a substitute for a healthy diet and exercise. The product should be used in conjunction with a healthy lifestyle for best results.



With a healthy diet and exercise, achieving weight loss is possible. But, sometimes, I need a little bit of help to lose some weight or keep it off in the long term.

According to the Centre for Disease Control and Prevention[1], 40% of American adults were obese in 2015-2016, and from 2013-2016, a whopping 49.1% of American adults had attempted to lose weight.

Clearly, a lot of people are having difficulty with this. This is where ketosis could help. Studies[2] have shown that, compared to low-fat diets, low-carb ketogenic diets fare well in reducing weight and improving blood lipid levels.

High blood lipid levels[3] can lead to heart disease and other health issues. If you’ve unsuccessfully tried a low-fat diet, this could be a good alternative.

Ketosis, or the state in which your body burns fat[4] for energy instead of carbohydrates, is known to have several benefits[5], including reducing insulin resistance, preventing cellular damage, and ensuring that more oxygen reaches your tissues.

But, there’s a significant roadblock in reaching ketosis: it can take days or even weeks[6] to get into it if you do it by altering your diet alone. Plus, ketone diets can be restrictive and have nasty side effects[7] like nausea, dizziness, and fatigue.

This is why KETO//OS NAT is great: the supplements help to put your body into a state of ketosis, without having to follow a restrictive keto diet. But, before starting any kind of supplement that can seriously alter your health and the way that your body uses energy, it is important to talk to your doctor. 

KETO//OS NAT can help kickstart your ketosis journey, thanks to BHB salts. These salts consist of sodium, potassium, and B-hydroxybutyrate, which is a ketone body. When you consume this ingredient, ketone bodies are put into your bloodstream, putting your body into a state of ketosis right away.

KETO//OS NAT also comes in 11 delicious flavors, including:

  1. Tru Passion
  2. Maui Punch
  3. Raspberry Lemonade
  4. Heart Tart
  5. Lime Time
  6. Berry Blue
  7. Strawberry Peach
  8. Blueberry Acai
  9. Splash
  10. Nat Lite
  11. Swiss Cacao

Each flavor comes in charged (caffeinated) and caffeine-free formats. My KETO//OS NAT review recommends taking a caffeinated sachet in the morning to replace your morning cup of coffee and help kick start your day. 

You can order 20 servings for $130, or subscribe for a monthly shipment and save $29 on each order of 20 servings. 

Who Is KETO//OS NAT For? 


KETO//OS NAT is for anyone who wants to “optimize their human potential”, according to Pruvit. Putting the body into a state of ketosis can help you lose weight, increase your cognitive abilities, and overall, be a better version of yourself.

This supplement is also great for anyone who has tried a keto diet and likes the benefits it comes with but finds it difficult to stick to a restrictive meal plan. 

While writing this KETO//OS NAT review, I found that children can take the supplements offered by Pruvit, but the dose should be adjusted[8] according to the age and weight of the child. It is appropriate for both men and women who are looking to improve their health. 



KETO//OS NAT can help you lose weight by putting your body into a state of ketosis, in which your body burns fat for energy instead of carbohydrates.

Thanks to the ingredients in KETO//OS NAT, such as vitamins B6 and B12, leucine, and taurine, it can also help you improve your cognitive abilities and increase your body’s production of amino acids. Amino acids are the building blocks[9] of all the body’s proteins, so they’re pretty important!

How Does KETO//OS NAT Work?


KETO//OS NAT works by inducing a state of ketosis in your body, without you having to follow a strict ketogenic diet. It accomplishes this with something called BHB salts, which put ketones directly into your blood.

Essentially, KETO//OS NAT provides your blood with exogenous ketones that can potentially increase your blood ketone levels even if you’re not in a state of nutritional ketosis. A study by the Journal of the International Society of Sports Nutrition talks about the efficacy of exogenous ketones like KETO//OS NAT.



KETO//OS NAT contains BHB salts, calcium, magnesium, sodium, and Vitamins B6 and B12. One study[10] showed that a high intake of these B vitamins throughout life is associated with better cognitive function. This product also contains:

  • Erythritol (a sugar substitute)
  • Natural flavor
  • Malic acid (flavoring)
  • Citric acid (flavoring) 
  • Stevia extract
  • Xanthan gum (a food thickener)

In addition, this product importantly contains Pruvit’s proprietary blend to help improve your cognitive abilities, increase your body’s amino acids levels, and suppress your appetite. It includes the following ingredients:

  • R-Beta Hydroxybutyrate: a 2020 study[11] showed that this ingredient can help to induce your body into a state of ketosis, without the typical side effects[7] that come with it, such as headaches, weakness, and nausea. 
  • L-taurine: this amino acid has been shown to have favorable effects on cognitive function. Studies[12] have shown that taurine accomplishes this by increasing the formation of new neurons, reducing inflammation, and reducing oxidative stress
  • L-leucine: Leucine is a ketogenic amino acid[13], meaning that it can only make ketone bodies, and does not make glucose. When the body is in a state of ketosis, leucine uptake[14] by the brain is increased. So supplementation with this amino acid can help support the body in its state of ketosis.
  • Uncaria Tomentosa: has been shown[15] to reduce DNA damage and increase DNA repair

How to Take KETO//OS NAT and Dosage


Pruvit recommends taking KETO//OS NAT at least twice a day: once before 9:00 am and another before 7:00 pm. Each serving comes in a sachet that should be mixed into 8-32 oz of cold water.

If you prefer a sweeter taste, consider mixing the titular supplement of my KETO//OS NAT review found with less water.  

Side Effects


Some customers experienced the following KETO//OS NAT side effects: upset stomach, diarrhea, stomach pains, gas, bad breath, and low blood sugar. If you are experiencing these side effects, consider reducing how much you are taking or talking to your doctor. 

What Do Experts Think?

Experts believe that there isn’t enough evidence on exogenous ketones like KETO//OS NAT yet. Most studies conclude that they show promise, it’s too early to issue blanket statements on exogenous ketones and their efficacy.


Here are three brands with similar offerings to the KETO//OS NAT:

  • Real Ketones: Broad selection of protein bars, chips, snacks, and drink mixes that are all keto-friendly.
  • HVMN: Collection of supplements like ketone esters, MCT oil, collagen, and CDP choline designed to help you remain in ketosis.
  • Perfect Keto: Whole-food keto snacks and supplements along with exogenous ketones.

KETO//OS NAT Reviews: What Do Customers Think?


A supplement that can put your body into ketosis without you having to stick to a strict diet? Sounds almost too good to be true! So, for my KETO//OS NAT review, I took to the internet to find reviews from customers around the world. 

First, I took to Amazon, where I found a ton of positive reviews. I looked at the Lime Time flavor, where 85% of customers awarded the product with a rating of 4 stars or greater as of April 2023. One happy customer had the following to say:

I love this product! Every time I take this in the morning my energy levels boost! I’m less hungry throughout the day, resulting in eating less, yet I have more energy still. I consider this my healthy “pack of crack”. Shipping and packaging is great as well.”

Another 5-star customer commented on the great taste: “Tastes good with no artificial sweetener flavor taste which I distinctively don’t care for. This one is refreshing and enjoyable.” 

Next, I took to Trustpilot, where the product’s parent brand, Pruvit, had an excellent rating of 4.7/5 stars based on more than 170 customer reviews as of April 2023. One happy customer, who recently started their keto journey, had the following to say:

So far so good… I have recently started with ketones. They give me a burst of energy that assists, especially with my workouts. I plan on continuing to use the product.”

While writing my KETO//OS NAT review, I found that Pruvit, the product’s parent brand, does not have reviews on its website. The brand is also not Better Business Bureau accredited.

There was a note on the BBB website stating Pruvit has received a significant number of complaints about shopping and honoring refund requests.

However, according to what I’ve found from other sources, the product itself does seem to work for most customers, who are bragging on a few websites about their KETO//OS NAT before and after results.

Here’s one such braggadocious review from Trust Pilot. “I’ve been drinking ketones for 4 months now and I feel amazing! I like the product overall. I’ve lost my cravings for sugar also stopped drinking redbull on a daily basis. I have tons of energy that I didn’t have before. the first month I did not notice any special effects. It came in month two and is becoming more and more apparent.

Is KETO//OS NAT Worth It?


The research-based ingredients in KETO//OS NAT and the hundreds of positive customer reviews online show us that this product is worth it.

While the cost is a little steep, customers seem to find that their weight loss, renewed energy, and mental clarity more than justifies the price.

KETO//OS NAT Promotions & Discounts 


While writing this KETO//OS NAT review, I found that Pruvit offers a subscribe and save option, where customers can sign up for monthly shipping and save 22% on each order.

The brand’s website also appears to offer rotating discounts on a variety of their products, but at the time of writing this review, there were no discounts specific to KETO//OS NAT. Check back on their website regularly to see if you can catch a deal!

Where to Buy KETO//OS NAT


You can buy KETO//OS NAT on Pruvit’s website and Amazon.


How many KETO//OS NAT supplements should I take daily?  

According to Pruvit, you should start by taking just one serving of the supplement every day. Once you get used to it, you can take at least two sachets of the supplement daily.

The brand recommends taking a caffeinated sachet in the morning to charge you up for the day, followed by a non-caffeinated sachet in the evening.

Should I take KETO//OS NAT with food?  

This supplement can be taken with or without food.

Is KETO//OS NAT vegan?  

KETO//OS NAT is vegan, thanks to its use of naturally fermented ketones and amino acids. 

Is KETO//OS NAT gluten-free? 

KETO//OS NAT is gluten-free.

What are the supplement facts of KETO//OS NAT? 

Each sachet of KETO//OS NAT contains one serving of 50 calories. It is dairy-free, gluten-free, and contains only 2% of the daily recommended carbohydrate value for adults, which is in line with the low-carb nature of ketosis.

What is KETO//OS NAT’s Shipping Policy?

Pruvit currently ships its products to the US, Australia, Canada, Mexico, New Zealand, and countries in Europe and Asia. All orders are processed within 2-3 days, and once your order is shipped, you’ll get a tracking number within 24 hours. 

Here are the shipping times for the US I uncovered while writing this KETO//OS NAT review:

  • UPS Ground: 3-5 business days
  • UPS Flat Rate: 5-7 business days

Shipping costs are calculated at checkout based on your location and the items in your order. Pruvit does not handle any customs or taxes that are applied to your order, so any fees that are applied after shipping are the responsibility of the customer.

What is KETO//OS NAT’s Return Policy?

If you’re not satisfied with your purchase, you can contact Pruvit Support within 30 days of the delivery of your product to arrange for the return of your product for a full refund, minus the costs of shipping and handling.

All purchases and refunds are processed in USD. You can start the return process by clicking here.

How to Contact KETO//OS NAT

If you have questions that are beyond the scope of my KETO//OS NAT review, you can contact Pruvit via the following methods:

As a web-based company, Pruvit does not have a phone number for customers to reach them.

For more keto products, take a peek at these brands:

Perfect Keto

Konscious Keto

Keto Chow

Article Sources

  1. Crescent B. Martin, M.P.H., M.A., Kirsten A. Herrick, Ph.D., M.Sc., Neda Sarafrazi, Ph.D., and Cynthia L. Ogden, Ph.D., M.R.P. Attempts to Lose Weight Among Adults in the United States, 2013–2016 NCHS Data Brief No. 313, July 2018
  2. Sumithran, P., & Proietto, J. Ketogenic diets for weight loss: A review of their principles, safety and efficacy ScienceDirect Obesity research & clinical practice, 2(1), 1-13
  3. Castelli, W. P. Lipids, risk factors and ischaemic heart disease ScienceDirect Atherosclerosis, 124, S1-S9
  4. What Is Ketosis, and Is It Healthy? Healthline, NUTRITION
  5. Veech, R. L. The therapeutic implications of ketone bodies: the effects of ketone bodies in pathological conditions: ketosis, ketogenic diet, redox states, insulin resistance, and mitochondrial metabolism ScienceDirect Prostaglandins, leukotrienes and essential fatty acids, 70(3), 309-319
  6. How Long Does It Take to Enter Ketosis? Healthline, NUTRITION
  7. Healthline Editorial Team Here Are the Worst Side Effects of the Keto Diet Healthline, NUTRITION
  9. Amino acids MedlinePlus, Medical Encyclopedia
  10. Qin, B., Xun, P., Jacobs Jr, D. R., Zhu, N., Daviglus, M. L., Reis, J. P., ... & He, K. Intake of niacin, folate, vitamin B-6, and vitamin B-12 through young adulthood and cognitive function in midlife: the Coronary Artery Risk Development in Young Adults (CARDIA) study The American journal of clinical nutrition, 106(4), 1032-1040
  11. Stefan, M., Sharp, M., Gheith, R., Lowery, R., & Wilson, J. The Effects of Exogenous Beta-Hydroxybutyrate Supplementation on Metrics of Safety and Health ResearchGate Age (years), 44(7.30), 45-55
  12. Chen, C., Xia, S., He, J., Lu, G., Xie, Z., & Han, H. Roles of taurine in cognitive function of physiology, pathologies and toxication ScienceDirect Life sciences, 231, 116584
  13. Takeuchi, F., Nishikata, N., Nishimura, M., Nagao, K., & Kawamura Jr, M. Leucine-Enriched Essential Amino Acids Enhance the Antiseizure Effects of the Ketogenic Diet in Rats Frontiers in neuroscience, 15, 225
  14. Yudkoff, M., Daikhin, Y., Nissim, I., Lazarow, A., & Nissim, I. Ketogenic diet, brain glutamate metabolism and seizure control ScienceDirect Prostaglandins, leukotrienes and essential fatty acids, 70(3), 277-285
  15. Yudkoff, M., Daikhin, Y., Nissim, I., Lazarow, A., & Nissim, I. DNA repair enhancement of aqueous extracts of Uncaria tomentosa in a human volunteer study ScienceDirect Prostaglandins, leukotrienes and essential fatty acids, 70(3), 277-285

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