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Our verdict: Keto OS NAT (or NAT Ketones) was an effective, straightforward solution for me as someone trying out the keto diet. I was worried at first, considering the amount of adjustment that does come with keto, but NAT Ketones were so helpful in the transition and helped me lose weight.
For those who want to get the benefits of a keto diet without following a strict diet, there are ketone supplements like Keto OS NAT by Prüvit. Ketone supplements supply your body with the same ketones your body makes naturally.
If you have any interest in fitness, diet, or nutrition, you’ve probably come across the ketogenic diet.
The ketogenic diet, or keto diet for short, is a very low-carbohydrate, high-fat diet that causes the body to burn fat for fuel instead of glucose. The keto diet has been shown to improve blood sugar levels, improve cognitive function, and help with weight loss.1,2
However, the keto diet can be hard to stick to because it’s very restrictive. A person who normally eats 2,000 calories a day has to limit their carbohydrates to less than 50 g/day.1 This means you have to cut out bread, pasta, potatoes, and most fruits. Not many people have the willpower to do this long-term.
The transition from a "regular" diet to keto can be difficult--but NAT Ketones did the trick for me and made it as seamless as possible.
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Prüvit endeavors to be the leading pioneer in ketone technology to help anyone and everyone interested in trying out the ketogenic diet.
They're a US-based company dedicated to optimizing health and wellness through their products. It's not just for weight loss but for total mental clarity, boosted energy, and an overall healthier lifestyle.
Prüvit wants to provide its customers with ways to stay on top of their health without having to adhere to sometimes overly restrictive diets.
Ketone Operating System Nutritionally Advanced Technology, or Keto OS NAT for short, is a comprehensive ketone supplement powder. It’s available in bulk powder individual packets.
Ketones are compounds made naturally by the liver that serve as an alternative energy source when your body isn’t able to use glucose. When your body is running off of ketones, it’s in a state of ketosis.
There are two categories of ketones:
Your body enters ketosis when you’re eating a very low-carbohydrate diet or fasting. Uncontrolled diabetes can also cause a dangerous form of ketosis that can result in serious harm, coma, and even death if not treated. You can also enter a state of ketosis by taking ketone supplements.
Keto OS NAT supplies the same ketones your body makes naturally during ketosis. This means you can experience many of the benefits of ketosis without having to follow a strict low-carb ketogenic diet.
Here are some of the most common points we've read from different customers.
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Keto OS NAT contains a proprietary blend called N8 Max NAT that includes:
Keto OS NAT also contains:
Keto OS NAT is sweetened with erythritol and stevia extract.
The B vitamins in Keto OS NAT provide extra energy. The amino acids and electrolytes support hydration, muscle function, and nervous system function.
There are two versions of Keto OS NAT: one that contains caffeine called “Charged” and a caffeine-free version called “Uncharged.”
Thankfully, there are several different flavors to choose from. I personally really enjoyed the strawberry peach, but if you're not into that, you can choose from:
It tasted very refreshing and didn't have that weird lingering aftertaste some food supplements or shakes sometimes have. I've heard that some people didn't like the lime time flavor too much, however, and that others thought it was a little artificial.
Still, I really enjoyed the drink. And I appreciate the flavor variety, especially since I sometimes tire of the same flavor every day.
Keto OS NAT costs $130 per box for a one-time purchase (20 servings).
You can also sign up for a monthly subscription which lowers the cost to $101.40 per box.
Keto OS NAT works by supplying your body with ketones so your body doesn’t have to make them. It contains beta-hydroxybutyrate, the ketone that has the most research behind it.
Taking ketone supplements boosts your blood ketone levels quickly, which allows your whole body–including your brain and muscles–to use them as an energy source.
Keto OS NAT is designed to put you into ketosis fast–within an hour. Contrast this to the time it takes you to reach ketosis by following a ketogenic diet: several days to weeks.4
Instead of fasting or needing to closely monitor your carbohydrate, protein, and fat intake, you can simply supplement with Keto OS NAT. Prüvit claims that their product can deliver the same benefits you would get following a ketogenic diet, such as more energy, better focus and concentration, and enhanced weight loss.
It may also help you avoid some of the downsides of following a ketogenic diet. This includes the notorious “keto flu” that occurs shortly after starting a keto diet and causes symptoms such as headache, fatigue, nausea, and brain fog.1
The keto diet may also raise your LDL-cholesterol (the so-called “bad” cholesterol), cause dehydration and electrolyte imbalances, and lead to constipation due to the lack of fiber in the diet.1
Many people take ketones before and during exercise or before an athletic event to give them extra energy and focus.
They can also be used to help improve mental energy and focus to help you with work, studying, or reading.
It’s best to take Keto OS NAT on an empty stomach, such as first thing in the morning. Not only are the ketones absorbed better, but eating a meal already gives your body the energy it needs, which makes ketones unnecessary.
You should avoid taking them before bed as the extra energy it gives you may interfere with your sleep.
Prüvit recommends you take at least two servings of Keto OS NAT a day for optimal performance.
Although research is limited, studies have found multiple benefits of supplementing with exogenous ketones like those found in Keto OS NAT.
By keeping your appetite in check, ketones may help you lose weight.
In one study, people taking a ketone supplement reported less hunger compared to those consuming a sugary drink.5
Ketones work by reducing levels of the hormone ghrelin, which stimulates appetite and is normally elevated during weight loss.5
While ketone supplements have never been tested for weight loss benefits in humans, they have led to increased weight loss in mice.6
However, there may be certain benefits to the ketogenic diet that you can’t get by supplementing ketones.
Ketones may help you perform better in the gym. During intense exercise, the body requires more glucose to use as fuel. When it can’t get enough glucose, your performance suffers.
By giving your body an alternative energy source, ketones help spare glucose. This means you’ll have more energy to exercise as you don’t have to rely solely on glucose.
In one study of 39 elite athletes, ketone supplementation improved endurance.7
Taking exogenous ketones has been shown to significantly lower blood sugar levels.8 High blood sugar levels can damage the eyes, kidneys, nerves, and blood vessels and are linked to an increased risk of heart disease.9
Ketones may help people who have Alzheimer’s disease or are struggling with cognitive decline.
Alzheimer’s disease reduces the brain’s ability to use glucose for energy. Ketones help sidestep this issue by providing an alternate source of energy.10
Ketone supplementation improved cognitive function and memory in a study of 20 people with either mild cognitive impairment or Alzheimer’s disease.10
Ketone supplements may also help protect the brain from damage caused by Parkinson’s disease by reducing inflammation.11
This is arguably one of the most appealing benefits of taking ketone supplements. They allow you to enter ketosis without having to greatly reduce your carb intake or suffer through the “keto flu.”
You can also reach ketosis quicker without having to wait days or weeks.
Yes, Keto OS NAT is safe for most people.
People who are sensitive to caffeine may want to opt for the caffeine-free version (Uncharged).
Type 2 diabetics who are taking medications to lower their blood sugar levels should speak with their doctor before taking ketone supplements, as they can further lower their blood sugar.8
There are potential side effects to ketones supplements, including:1,12
You can buy OS NAT Ketones on Prüvit's website.
During my month-long trial, I swapped out my coffee for the caffeine-free version (“Uncharged”) of Keto OS NAT. Normally, I experience a significant dip in my energy levels when I take a break from coffee, but this wasn’t the case when I was taking Keto OS NAT.
Instead, I felt a subtle increase in energy that lasted for hours. It was a clean energy boost, markedly different from the one I would get drinking coffee which can tend to make me feel jittery or tense.
I also experienced increased focus and mental clarity. It was just easier to keep my attention from wavering and really hone in on the task at hand.
Prüvit really nailed it on the flavor, especially for the strawberry peach. It’s sweet but not overly sweet and doesn’t leave any weird aftertaste in your mouth.
They also have a wide selection of flavors–12 flavors that are available year-round and 10 seasonal flavors–so you’re sure to find something you like. The variety is nice to have if you have a picky palate or plan on becoming a regular consumer of Keto OS NAT and want to switch things up occasionally.
I practice a 16-8 intermittent fasting schedule most days (16 hours fasting with an 8-hour feeding window). I usually rely on caffeine to help control my appetite. However, Keto OS NAT was much more effective in keeping the hunger pangs away than coffee or tea.
Keto OS NAT raises your ketone levels quickly. I found that within one hour of taking one packet on an empty stomach, my ketone levels rose to around 5 mg/dL–about the level I would reach following a strict ketogenic diet.
The packaging for the “Charged” version says it contains as much caffeine as a 12-16 oz cup of coffee. That is a wide range of coffee that makes it unhelpful in determining the caffeine content in Keto OS NAT.
Additionally, the amount of caffeine in coffee varies considerably depending on the roast, brewing method, and origin of the beans.
I’m not quite sure why they chose not to reveal the exact amount of caffeine per serving. It seems like this number would be easy enough to obtain from testing.
For people who are caffeine sensitive or want to limit their intake, knowing the exact amount of caffeine in a supplement is important.
At 910 mg, Keto OS NAT contains nearly 40% of the daily value (%DV) of sodium. This can put you over the edge in terms of your daily sodium intake, especially if you’re already getting enough from food.
This isn’t much of an issue for people who regularly engage in intense exercise as you lose a lot of sodium in your sweat. However, people who are watching their salt intake due to high blood pressure or other health reasons may want to avoid Keto OS NAT.
At $6.5 per serving, Keto OS NAT is one of the more expensive ketone supplements on the market. While signing up for a subscription lowers this cost to $5/serving, it’s still costly.
You’ll have to determine for yourself if the possible benefits are worth it.
Just like a keto diet, ketone supplements can create a weird taste in your mouth. This is due to acetone, a byproduct of ketones that you exhale. Brushing my teeth only slightly improved the taste.
|Number of flavors
|Types of ketone/s
|Keto OS NAT
|$130 for a one-time purchase
|12 regular flavors with around 10 seasonal flavors
|$39.99 for a one-time purchase
|3 flavors (plus "unflavored" capsules)
|$107.99 for a one-time purchase
|Beta-hydroxybutyrate (BHB) and MCT oil
|$69 for a one-time purchase
|Raw ketone ester
While Perfect Keto Base is more affordable at around $2.6 per serving, Keto OS NAT still beats it out in terms of flavor and variety.
Perfect Keto Base has only three (3) flavors (plus an "unflavored" capsule option), and while they're also pretty tasty, I find Keto OS NAT more appealing still.
One thing that Perfect Keto Base does get right, however, is the added electrolytes, as it helps you avoid the keto flu as much as possible (if not altogether).
Real Ketones Elevate D-BHB Ketones come in convenient smaller packs, making them easier to carry around and control in terms of portion. While they do have that advantage over Keto OS NAT, I find that they're still not as tasty.
They're also much cheaper, at almost $2 per serving. Like Perfect Base, they also have added electrolytes to help you avoid keto flu.
Still, Keto OS NAT has a few more proven success stories when it comes to energy and clarity.
Keto OS NAT takes the cake, as TruBrain Ketones only serves one flavor. Still, it's pretty tasty.
Aside from the flavor disparity and the price, TruBrain Ketones is still a great option if you don't mind a chocolate supplement every day.
I find that TruBrain does absorb faster, but Keto OS NAT tends to sustain me longer.
If you want to experience many of the benefits of ketones without having to follow a strict ketogenic diet or experience its downsides, Keto OS NAT is a great option for you.
Keto OS NAT may be especially helpful for athletes or those performing tasks that require lots of mental and physical energy and focus.
While there is evidence that ketones may help control appetite, slow cognitive decline, and improve athletic performance, research is still limited.
For some people, the high of Keto OS NAT may outweigh any purported benefits. Thankfully, Prüvit allows you to return the unused portion of the product within 30 days for a full refund if you’re not satisfied.
Others may want to wait until more research has confirmed the benefits and risks of ketone supplements, which is fair.
As always, before starting any supplement, please consult your healthcare provider first.
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