KE consumption decreased FFA from 0.6 to 0.2 mM, TG from 1.0 to 0.8 mM, and glucose from 5.5 to 4.7 mM by the end of the study (4 h). The effect was not altered by a meal (Figures 5A–C). Dextrose drinks also lowered FFA from 0.6 to 0.2 mM and TG from 1.0 to 0.7 mM (Figures 5A, B). This was likely mediated by the transient increase in glucose, which rose from 4.6 to 6.5 mM following the dextrose drink (Figure ​(Figure5C).5C). The anti-lypoytic effect of dextrose drinks was shorter than that of KE drinks as d-βHB concentrations were elevated for longer after KE drinks than glucose after dextrose drinks. Insulin increased to ~ 35 mU.ml−1 after both the meal and the dextrose drink, but also increased to 13 ± 2 mU.ml−1 when KE was consumed whilst fasted owing to the 15 g of glucose in the flavored drink used as a diluent (Figure ​(Figure5D5D).
Lastly, EK products in general ​are usually in the form of salts, which is why they are referred to as BHB Salts. The BHB ketones are bound to common salts such as sodium​, calcium, magnesium and potassium​ to improve absorption rate. These salts are also the core electrolytes your body needs to help you avoid feeling mentally drained and physically lousy during the keto-flu transition period.
It was explained to me that exogenous ketones inhibit lipolysis (breaking down of fat cells), therefore triglycerides should be expected to go down. They theorize that ketones may promote transfer of triglycerides from blood into cells, which primes the pump for fat burning, but to verify would require conducting biopsies to measure blood versus tissue.
Sometimes waiting for your body to make the switch from carbohydrate metabolism to beta hydroxybutyrate metabolism (aka ketosis) can be an uncomfortable and lengthy process. Another way to get beta hydroxybutyrate into your system so your body is using “clean” energy is by taking it supplementally or through nutrition. A betahydroxybutyrate supplement is what can be used in this scenario. This is an exogenous ketone. Exogenous means you get it from outside of your body. Think EX = exit = outside.

If you have tried other ketone supplements that haven’t worked as promised or tasted terrible. Have no fear. This stuff is what a ketone supplement should be. It’s incredible what customers tell me. How it’s given them more energy, focus, drive. Helped them lose weight and suppress their appetite. Help them train harder at the gym and all kinds of great stories.*
There have been studies done on long term ketogenic diets. This 2004 paper inn Experimental & Clinical Cardiology titled ‘Long-term effects of a ketogenic diet in obese patients’ concluded that obese patients following a ketogenic diet for 24 ‘reduced the body weight and body mass index of the patients. Furthermore, it decreased the level of triglycerides, LDL cholesterol and blood glucose, and increased the level of HDL cholesterol. Administering a ketogenic diet for a relatively longer period of time did not produce any significant side effects in the patients. Therefore, the present study confirms that it is safe to use a ketogenic diet for a longer period of time than previously demonstrated.’
Beta-hydroxybutyrate (BHB): Nutrition strategies that rely on carbohydrates always leave us needing more food. On the other hand, the ketogenic diet relies on and taps into your body’s stored fat for longer, more stable energy with no bonking. Many keto-lovers adopt this lifestyle because they love the mental clarity, focus, and productivity that they experience while in ketosis. Whether you’re full-time keto or not, our Perfect Keto is designed to support ultimate mental performance.

Intermittent fasting is using the same reasoning – instead of using the fats we are eating to gain energy, we are using our stored fat. That being said, you might think it’s great – you can just fast and lose more weight. You have to take into account that later on, you will need to eat extra fat in order to hit your daily macros (the most important thing). If you’re overeating on fats here, you will store the excess.


Ketoacidosis is driven by a lack of insulin in the body.  Without insulin, blood sugar rises to high levels and stored fat streams from fat cells.  This excess amount of fat metabolism results in the production of abnormal quantities of ketones. The combination of high blood sugar and high ketone levels can upset the normal acid/base balance in the blood and become dangerous.  In order to reach a state of ketoacidosis, insulin levels must be so low that the regulation of blood sugar and fatty acid flow is impaired.

There are enticing anecdotes of supplemental ketones being used to boost human physical performance in competitive events, notably among elite cyclists. Given that BOHB can deliver more energy per unit of oxygen consumed than either glucose or fatty acids (Sato 1995, Cox 2016, Murray 2016), this makes sense. But what we do not know is if there is any required period of adaptation to the use of exogenous ketones, and thus how to employ them in training. It is clear that exogenous ketones decrease adipose tissue lipolysis and availability of fatty acids, the exact opposite to what happens on a well formulated ketogenic diet. This distinction between exogenous ketones and ketogenic diets on adipose tissue physiology and human energy balance underscores an important reason why these two ketone-boosting strategies should not be conflated.
The body will start making ketones when either we go extended periods without food, or we restrict the one dietary component that stops ketone formation – this being carbohydrates and also minimising protein intake as this also can halt ketone. In turn, your primary source of food is fat, with very little carbohydrate and a small amount of protein.”

An alternative to the ketogenic diet is consumption of drinks containing exogenous dietary ketones, such as ketone esters (KE) and ketone salts (KS). The metabolic effects of KS ingestion have been reported in rats (Ari et al., 2016; Kesl et al., 2016; Caminhotto et al., 2017), in three extremely ill pediatric patients (Plecko et al., 2002; Van Hove et al., 2003; Valayannopoulos et al., 2011) and in cyclists (O'Malley et al., 2017; Rodger et al., 2017). However, the concentrations of blood βHB reached were low (<1 mM) and a high amount of salt, consumed as sodium, potassium and/or calcium βHB, was required to achieve ketosis. Furthermore, dietary KS are often racemic mixtures of the two optical isoforms of βHB, d-βHB, and l-βHB, despite the metabolism of l-βHB being poorly understood (Webber and Edmond, 1977; Scofield et al., 1982; Lincoln et al., 1987; Desrochers et al., 1992). The pharmacokinetics and pharmacodynamics of KS ingestion in healthy humans at rest have not been reported.
When our cells undergo the process of autophagy, non-essential parts like damaged proteins are recycled and invading microorganisms and toxic compounds are removed. This means that autophagy plays an important role in stopping the aging process, reversing disease, and preventing cancer, but it doesn’t happen all the time. Fasting, protein restriction, and carbohydrate restriction are the three main ways that can initiate different autophagic processes — all of which are not the same. This is part of the reason why a ketogenic diet has so many positive effects, and it also shows you why intermittent fasting is a way to improve your diet even more.
I (Kim) researched the topic and planned and ran the experiment under the guidance and supervision of Dr. Andreas Eenfeldt, who touched base with me every step of the way to check the experiment design and execution for scientific rigor (to the greatest degree possible) and who has edited this writeup for quality and trustworthiness reasons. I also consulted with other keto experts and researchers to gather feedback both on the experiment design and the results data. They are referenced in the text when this was the case.
The final graph, below, shows the continuous data for only VO2 side-by-side for the 20 minute period. The upper (blue) line represents oxygen consumption under control conditions, while the lower line (red) represents oxygen consumption following the BHB ingestion. In theory, given that the same load was being overcome, and the same amount of mechanical work was being done, these lines should be identical.
The way you make an exogenous BHB is by attaching it to some type of other compound (sodium, potassium, calcium, or magnesium) so that your body can process the molecule by cleaving the bond between the salt and the beta hydroxybutyrate. BHB + bound to a salt = BHB salts, which is what most people in the ketosis community call exogenous ketones. There are also things called esters, which are basically unbound BHB molecules. These are really disgusting and cause massive digestive issues, so I like to ignore them until we can produce them in a more appealing way.
One thing to remember here is that even if your calculated daily ‘keto approved’ protein allowance is (let’s say) 150g, that doesn’t mean you can eat 150g in one meal and still be in ketosis. You may find that you can’t eat more than 40g of protein at a time, otherwise you will drop out of ketosis. OR, you may find you can eat 50g of protein but you need a LOT of fat. Whereas a small serve of 15g of protein without fat might knock you out of ketosis. 
Onnit is an incredible company that’s making a massive impacts in the lives of athletes in nearly every sport. From Olympic Gold Medalists, to NFL middle linebackers, Onnit has taken athletic performance to a new level. Providing supplements, food, and training equipment, Onnit was an early adopter of the elite performance booster that is exogenous ketones!

I just started down the Keto path with the help (hopefully) of Ketond. My problem with all the websites and info I’ve seen is that no-one says how often you should take the EK. The packages say the serving size is one scoop…. but how many servings per day? It (Ketond) also says one serving will put you in Ketosis for 3-5 hours – so, does that mean you should take another serving after the 3-5 hours to stay in Ketosis?


I just read your comment and was wondering the same thing. I can see how exogenous ketones can be a great energy boost to people on the ketogenic diet, but I don’t see how they can speed fat loss. Keto OS claims you can eat higher carbs and still see the benefits of ketosis. I don’t see how that is possible. the whole point of weight loss through ketosis is the breaking down of your own fat to create energy. I don’t see how exogenous energy will increase natural fat breakdown. I wish I could get a straight answer to this from somebody.
Fortunately a new way to test ketosis has been developed - and that is by measuring acetone levels in the breath. This is rather new technology but based on the reports I have seen it does look reasonably reliable. The testing process is simple, you use a device like that made by Ketonix, you breathe into it, wait a minute or so and it will give you a color indicating the state of ketosis you are in. However, there are numerous downsides:

Weight loss benefits ushered the keto diet into the spotlight. That’s how most people have likely heard about ketones, a fuel source created naturally by the body when burning fat. But more and more research points to diverse applications of ketones in the blood outside of just fat loss, from improved endurance performance to the treatment of medical conditions like epilepsy.

The year before last I somehow full on Rocked at the keto diet lost 100lb, and was taking adderall. I am transitioning back into it again also back on the adderall, but i seem to have no energy and last time my doc did my blood work i was only 16% hydrated. Obviously it’s a huge problem for me, staying hydrated and trying to lift the fogginess. I am type 2 diabetic and my doctor is on board with me trying all to keep my sugars down YEAH!!! I have never tried any exogenous product. My body seems to not absorb much vitamins. Can anyone make a or any suggestion to me as to how to get this under control?
Too low of sodium intake can be just as dangerous as getting too much. As with all essential nutrients, the graph for risk associated with sodium and health problems is actually u-shaped, such that both low and high quantities of sodium are associated with risk of cardiovascular disease and all-cause mortality[8]. Evidence also suggests that restricting sodium to the recommendations may rapidly increase plasma levels of renin, angiotensin II, and aldosterone, which can lead to complications in itself[9].

These statements have not been evaluated by the Food and Drug Administration. The content of this website is not intended for the treatment or prevention of disease, nor as a substitute for medical treatment or medical advice. Use of recommendations is at the choice and risk of the reader. If you are under medical supervision or taking prescription medications, please consult with your family doctor or medical provider before starting any new eating plan. Ketologie products are not intended to treat, cure or prevent any disease. Pregnant or breast feeding women should consult their health care professional before consuming.
Halitosis (bad breath) – If you’re on a ketogenic diet you are probably aware that as the body starts to metabolize fat, ketones can cause poor breath. There is very little one can do about this, it’s just the nature of the beast. Unfortunately, this can also arise when using exogenous ketones, but it’s not as lasting as when on a ketogenic diet. Chewing gum or mints is about the best option if it becomes a noticeable issue. This maybe caused by over consumption of the ketone supplement, tailoring the quantity consumed may prevent excess BHB being converted to acetone, which is likely excreted by the lungs.

My two cents: I wouldn’t take ketone supps if not on some sort of low(ish) carb diet because the idea of high levels of BOTH fuels (ie, ketones AND glucose) doesn’t seem physiologically appropriate… more like a recipe for disaster, and by “disaster,” I mean “out-of-control production of Reactive Oxygen Species” — this might not matter if you’re an athlete looking for a quick performance boost, because the fuels are going to be cleared rather quickly… not so much if you’re a desk jockey.
You see, when someone says ketosis is a natural state, they mean that ketosis is the body’s backup plan for those times when there isn’t any food to eat. It’s an evolutionary adaptation that developed over hundreds of thousands of years and springs from a time when our distant ancestors often had to go many days between decent meals. Fortunately, these days actual starvation is pretty rare so most people will never be in ketosis. But the physiological mechanism is still there, lurking in the background, readily accessible to anyone who is willing to trick their body into thinking it’s starving.

Sure Leslie, the goal is to induce the burning of stored fat in your body. This process usually take a few days of strictly limiting carbohydrate intake. Supplementing with exogenous ketones is a way to shortcut the wait time, essentially “tricking” your body into ketosis. I imagine supplementing with too many could have negative effects on fat loss, but the research is not out supporting that claim yet.

Over the years, we have seen and heard many different things about the effects and benefits of Raspberry Ketone supplements. Be it capsules or sprays, the discussion around them actually working always had opposing sides. So, we decided the best solution was to do our own research by conducting our own reviews on the most talked about products, to find out exactly how good they were as a "top-rated" ketone supplement.


Over four visits, participants (n = 15) consumed 1.6 and 3.2 mmol.kg−1 of βHB as KE (141 mg/kg and 282 mg/kg of R-3-hydroxybutyl-R-1,3-hydroxybutyrate) or as KS (KetoForce, KetoSports, USA) sodium and potassium βHB, containing 1.6–3.2 g of each cation), plus 6 g of sweetener containing 19 kCal (4 g of carbohydrate) (Symrise, Holzminden, Germany), diluted to 300 ml using water. Drink blinding was not possible due to unmaskable differences in taste (bitter vs. salty).
Elliot received his BS in Biochemistry from the University of Minnesota and has been a freelance writer specializing in nutritional and health sciences for the past 5 years. He is thoroughly passionate about exercise, nutrition, and dietary supplementation, especially how they play a role in human health, longevity, and performance. In his free time you can most likely find him lifting weights at the gym or out hiking through the mountains of Colorado. He will also host the upcoming BioKeto podcast. You can connect with him on Facebook (https://www.facebook.com/elliot.reimers) and Instagram (@eazy_ell)
Your brain has a very tight barrier so not everything in the blood can get through. This is called the blood brain barrier. Because your brain uses 25% of the energy that your entire body uses throughout the day, you need to make sure it is fueled appropriately. Glucose can’t directly cross the blood brain barrier. When you eat carbs, you get swings in energy that is available to cross the blood brain barrier which leads to mental fog.
EK use can be compared to the nootropics that have been developed for optimizing focus, memory creation, and faster cognitive performance. While you may not notice this effect on a minute to minute basis if you keep a journal of “forgetful moments” you’ll find that you have fewer of them as time goes on. You’ll also find that you’re able to come up with better ideas, and your workflow is more efficient through the day (10, 11).
Hello! I’m planning on taking a short vacation and will be having “kept friendly” drinks, mostly vodka and water with lemon and stevia. When should I take my exogenous ketones? That night before bed or early the next morning or after the 3 day vacation is completely over? I’m unsure how to manage this to have the best odds of staying in ketosis and get back to burning FAT. Also, I just purchased Instaketones from Julian Bakery, what are your thoughts on this brand? Thanks for what you do!
Core BHB™ provides pure goBHB™ in an all-natural formula with no artificial sweeteners, making ideal for those on the keto diet, athletes, and people who are health-conscious. Even if you’re on a high-carb diet, Core BHB™ will rapidly elevate blood ketone levels and help your body enter a state of ketosis (often with 30 minutes of consumption). In turn, you will experience increases in energy, fat loss, endurance, and mental acuity. With regular use of Core BHB™, you can also speed up the transition from a higher-carb diet to the ketogenic diet and reduce symptoms of the “keto flu”.
Intermittent fasting involves merely changing your eating cycle whereby you prolong the period in which you will have your first meal. This diet plan helps to create a smaller eating window. In doing so, it means that you will consume less amount of calories. In addition to depriving the body some calories, intermittent fasting forces the body to begin burning fats. It does so to compensate for the current deficiency.
Until there is more definitive information on the necessary blood levels and the differing proportions of BOHB an AcAc to optimize cellular and organ functions, it will be difficult to specify the dosing and duration of supplemental ketones. However for fuel use, and very likely for exercise performance as well, sustained blood levels of BOHB in the range of 0.5 mM to 1.0 mM are likely to be required. This is achieved physiologically by an estimated ketone production of 50-100 grams per day in a keto-adapted human.
I heard a rep from Perfect Keto on a podcast and your Exogenous Ketones. I ordered and received it the other day. I see from this article that I should not do a full scoop at once, but break it up in a day. Good to know. I had about a half scoop before I worked out this morning and could tell I had more energy. Loved that. Just curious….any ideas how long it will take me to get back into ketosis and fat burning?? (I know it depends on what I eat, but a general idea that I promise not to hold you too! (I’m actually missing having ‘keto breath!)
Beta hydroxybutyrate floats around in your blood, and importantly, can cross different barriers to be able to be turned into energy at all times. One of the most important areas where this happens is in the brain. The blood-brain barrier (BBB) is usually a very tightly regulated interface that doesn’t allow the transfer of many molecules, but since BHB is such a rock star and so hydrophilic, your brain knows to let it in so it can bring energy to the party at any time. This is one of the main reasons why increased levels of ketosis lead to improved mental clarity, focus and reduction in neurodegenerative diseases.
The ketone supplements were associated with a 5.4% decrease in physical performance while the artificially-sweetened, non-caffeinated beverage I used as a placebo was associated with a 20.3% increase: a big difference in favour of the placebo. Before you go rushing out to buy some, remember that this experiment was not performed under fully-controlled, laboratory conditions, and we were working with too small a group to prove that the placebo caused an increase in physical performance. But what we can say is that we couldn’t find any correlation between ketone supplements and an increase in physical performance in this experiment. According to Brianna Stubbs, some of the work currently being done on new kinds of ketone salts is starting to show more promise in relation to physical performance, so there may be better news on this down the line.
Ketone supplements: are they a groundbreaking boost to a low-carb diet, or should you be wary of the broad claims that companies make about their benefits? In this article you’ll learn all about exogenous ketone supplements and, what’s more, you’ll read about the experiment we ran on the supplements at our head office in Stockholm. How did ketone supplements perform when we put them to the test? Do they work? Read on to find out our verdict!

First, there’s something unnatural about having elevated levels of ketones and glucose together. It’s really hard to make that happen using traditional whole foods. The closest natural approximation you could get to it would be the traditional coconut-rich diets of the Kitava people in the South Pacific, where the medium chain triglycerides (MCT) in the coconut fat increased ketone production alongside the carbs in the fruit and tubers they ate. They had excellent metabolic health, but they weren’t anywhere close to a ketogenic diet. Coconut fat isn’t as ketogenic as purified MCT oil, let alone exogenous ketones.
First and foremost, one of the most important factors is to be discipline when following the ketogenic diet. This means heavily restricting your carbohydrate intake, while switching to high-fat foods and moderate proteins. The general rule of thumb when it comes to splitting your macros out should look something like this: 5% (carbs)/ 80% (fats)/ 15% (proteins). Although if you’re just starting out, I wouldn’t focus too heavily on macros but rather place more importance in restricting your carbohydrate intake to 20 grams or less. Depending on the individual, most keto diets will allow approximately 20g-70g of net carbs as part of your overall daily intake, but if you’re asking the extreme question of ‘how to get into ketosis in 24 hours?’ then let’s focus on the absolute limit. For a more detailed breakdown, please see my keto shopping list article.
Intermittent fasting will significantly help the body transition into ketosis as limiting your consumption of food for that many hours will help deplete the system of any excess glucose. It’s a shock to the system and research has shown that daily fasting can have other profound effects aside from weight control such as autophagy, lowering risks of heart disease and diabetes, as well as an improvement in cognitive function. So if you’re still wondering how to get into ketosis in 24 hours, then fasting will surely kick things into gear!
Despite the recent growth of the ketone salt market, there is very little published work analyzing the effects of these products on any biomarkers or performance measurements in humans. Several studies have been carried out in rats,6,7 with blood BHB levels being relatively low (<0.5 mM) post-consumption of salt drinks. In humans, ketone salts provided peak D-BHB levels of 1 mM, whereas the same amount of BHB in a ketone ester (BD-BHB) raised blood BHB to 2.8 mM.5
Because of how effectively exogenous ketones can reduce hunger for those in ketosis, pay attention to the cues your body gives you. It’s possible to extend your fasts longer than necessary because of a decreased appetite cue. While those who have some weight to lose might be tempted to think this is a favorable side effect, there is a difference between fasting and starving for nutrients. Make sure to get enough food to support your activities and maintain your muscle mass.
Because they’re so expensive, you want to make sure you pick a good one. Griffin and Langer say to ignore the companies that make these supplements sound too good to be true. Just like with any supplement, Griffin says it’s important to look at what’s in it. Beware of products with lots of fillers and instead go for one with a short, straightforward list of ingredients (Griffin likes the options from KetoSports).
I bought this because I didn't want to be sucked into an autoshipment for a ketone supplement like KetoOS, which is HOT right now. I did the comparison on the ingredient list between this product and KetoOS and they are quite similar. I think one of the big differences is that KetoOS has the option of caffeinated or non-caffeinated powders. For the cost and the free shipping (I'm a Prime member), it's something I could easily fit into my budget, rather than the $114 canister you'd get with KetoOS.
Long-Term Effects of a Ketogenic Diet in Obese Patients – The present study shows the beneficial effects of a long-term ketogenic diet. It significantly reduced the body weight and body mass index of the patients. Furthermore, it decreased the level of triglycerides, LDL cholesterol and blood glucose, and increased the level of HDL cholesterol. Administering a ketogenic diet for a relatively longer period of time did not produce any significant side effects in the patients. Therefore, the present study confirms that it is safe to use a ketogenic diet for a longer period of time than previously demonstrated.

Plecko B., Stoeckler-Ipsiroglu S., Schober E., Harrer G., Mlynarik V., Gruber S., et al. . (2002). Oral beta-hydroxybutyrate supplementation in two patients with hyperinsulinemic hypoglycemia: monitoring of beta-hydroxybutyrate levels in blood and cerebrospinal fluid, and in the brain by in vivo magnetic resonance spectroscopy. Pediatr. Res. 52, 301–306. 10.1203/01.PDR.0000019439.27135.2B [PubMed] [CrossRef]

Because of how effectively exogenous ketones can reduce hunger for those in ketosis, pay attention to the cues your body gives you. It’s possible to extend your fasts longer than necessary because of a decreased appetite cue. While those who have some weight to lose might be tempted to think this is a favorable side effect, there is a difference between fasting and starving for nutrients. Make sure to get enough food to support your activities and maintain your muscle mass.

The concentrations of blood d-βHB after KE drinks were highly repeatable whether consumed whilst fasted or fed (Figures 4F,G). The d-βHB Cmax values ranged from 1.3 to 3.5 mM when fed and 2.3 to 4.7 mM when fasted. There was no significant effect of visit order on d-βHB kinetics, with the maximal difference in d-βHB Cmax reached by one individual being 1.2 mM when fed and 1.9 mM when fasted. Approximately 61% of the variation in the data was attributable to feeding (fed vs. fasted), <1% to visit order, 16% to inter-participant variability, and the residual 24% variability due to non-specific random effects.
Some general side effects of your body producing beta hydroxybutyrate is essentially the lull in time it takes to switch from carbohydrate metabolism to fat metabolism, which can take 3-4 days. This can lead to mood swings, fatigue, and general low energy. If you want to skip that step, we recommend taking exogenous BHBs to switch your body over effortlessly.

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