It might sound absolutely crazy to go that long without food. Especially when you consider traditional diets that recommend eating 3-5 small meals each day, starting with breakfast – the “most important” meal of the day. But if you think back to hunter gatherer times, human beings didn’t always have food accessible to us. Farming and agriculture hadn’t existed so our first meal each day would vary quite vastly. If you think about the word itself, ‘breakfast’ means to break-fast. We didn’t have a set time where we would consume our first meal – it was dependent on accessibility. So if you’re wondering how you’re going to survive without going for food for 16 hours, the answer is straight forward – you can! Let’s simplify this and break down what this may potentially look like.

Good question. There have been many tests and studies that have been conducted to see if ketogenic supplements genuinely do work and many of these studies have shown that ketosis theories are correct. Adding ketones to your body and using fats as a resource of energy has some fantastic effects and if done right can help your body fight all sorts of ailments such as cancer, heart disease, diabetes and many other illnesses that can only be cured by chemical therapy. Keto therapy or nutritional ketosis is paving the way for more natural solutions, and it's a good thing that scientists have created these exogenous ketone supplements that help us induce more ketones in our body.
Taking exogenous ketones not only eliminates the need to follow a strict ketogenic diet to achieve ketosis (so you can have your high carb cake and eat it too), it can also help users get there faster. “They can expedite the process of getting into ketosis and becoming fat adapted,” Davis explains. “They can also help people push past the keto flu and potentially experience more mental energy and clarity than from diet alone.”
Hi- Thank you for this super helpful post. I’m new to Keto and supplementing Keytones. I just got the Julian Bakery Keytones and am curious about how to take them as there are no instructions on the packaging. Indeed the website has a diet plan to follow with the keytones but I am very suspicious of it because it is 0 fat which I believe is not healthy for brain or body and given that I have soft tissue and joint issues, I try to eat enough fat daily. I want to lose weight and I crossfit 5 days per week. So how do I best start with using the keytone supplements? I took a scoop full yesterday when they arrived (in the early afternoon) but hadn’t yet eaten and I think that was a mistake because I had immediate diarrhea which lasted a few hours, even after eating.

Of course, there may be some people who choose to take these supplements because they genuinely do feel they benefit from them. This is of course your choice and this article in no way aims to shame or criticize anybody. However, I do think that, for most people, eating a low-carb diet based on real foods is a lot more likely to be associated with the benefits that the supplements claim to provide than the supplements themselves.


Ketones naturally exist in the body, being created during the process of fat metabolism and are therefore safe to consume even during pregnancy or breastfeeding. Supplements such as Ketologie’s PROBHB are simply providing ketones from an external (exogenous means literally ‘outside of the body’) source. However, if you suffer from any medical conditions and/or are on medications, it is always advisable to consult your health care provider prior to starting any new nutritional or dietary supplement.  
Participants refrained from alcohol and caffeine for 24 h prior to each visit AND were asked to consume a similar meal the night before each visit. All studies were carried out at the University of Oxford Human Physiology Laboratories and started at 0800 h following an overnight (>8 h) fast, with a minimum of 72 h between visits. Visit order was randomized prior to commencement by an administrative investigator using a pseudo-random number generator to produce a list of combinations of visit order, which were then allocated based on order of enrolment by a different investigator.
In Summary, I think it’s important to do your own research and draw your own conclusion about the long term risks of ketosis. For some people, a ketogenic diet may be a necessity given their health situation. For those of us who do not suffer from such health conditions I would present the question ‘why do you want to follow a strict ketogenic diet for an extended period’, and then follow this up with ‘are the potential risks and sacrifices worth the benefits?’

I started this website because it was hard to find trustworthy, evidence-based information about the ketogenic diet. Information that was published and peer reviewed by respected scientific journals. After years of research, I'm sure you'll achieve great results in a healthy way following my advice. I do my best to translate scientific research jargon into plain English. Remember, it's always a good idea to consult a doctor before starting a new diet!


Exogenous ketones provide the body with another fuel to employ. Think about it like an electric car that runs on both gas and electricity: by consuming ketones along with carbohydrates, the body will preferentially burn the ketones first, saving the carbohydrates for later. Exogenous ketones allow us to enter a metabolic state that wouldn't occur naturally: the state of having full carbohydrate stores, as well as elevated ketones in the blood. This could be advantageous to athletes looking to boost their physical performance. 

Task switching is the process of adapting to changing circumstances (switching from one goal to another). Two cards are shown one above the other, and a combination of letter and a number (i.e., “A4”) will appear on one of the two cards. If it appears on top, the task is to indicate whether the number is an even number, and if on the bottom the task is to indicate whether the letter is a vowel.


Plasma glucose, free fatty acids (FFA), triglycerides (TG) and urinary d-βHB were assayed using a commercial semi-automated bench-top analyzer (ABX Pentra, Montpellier, France), and insulin was measured using a commercially available ELISA assay (Mercodia, Uppsala, Sweden). Both the pure liquid KS and KE, and a subset of plasma (n = 5) and urine (n = 10) samples from a subset of participants in Study 1 underwent analysis using GC-MS and a chiral column, and the concentrations of l-βHB was calculated using the enzymatically determined concentration of d-βHB and the ratio of the d/l-βHB peaks obtained through GC-MS. Acetoacetate was assayed using an enzymatic method (Bergmeyer, 1965), and breath acetone was measured using GC-MS (Study 1) or with a handheld electrochemical device (Study 2; NTT DOCOMO, Japan) (Toyooka et al., 2013).

Over the past couple years, I’ve tried a number of ketone supplements, generally to enhance a longer fast or to offer an edge before one of my Ultimate Frisbee evenings. This Kegenix variety is one I’d recommend. I’ve also used Quest Nutrition MCT oil powder with good results as well, but there are plenty of other solid formulations to choose from.
Our mission at Ketologie is to help educate and assist people in transitioning to a ketogenic way of eating for life. Primarily, we support people achieving this via adopting a VLCHF or ketogenic way of eating. Exogenous ketones can however play a useful role in transitioning to and maintaining a ketogenic lifestyle, and so we have exhaustively researched and developed a unique, “next level” ketone supplement that focuses specifically on optimizing health via the gut-brain axis.
Effects of ketone supplementation on body weight: Rats administered ketone supplements gained less weight over the 4-week period; however, did not lose weight and maintained healthy range for age. KE supplemented rats gained significantly less weight during the entire 4-week study compared to controls. BMS + MCT, BMS, and BD supplemented rats gained significantly less weight than controls over weeks 2–4.MCT supplemented rats gained significantly less weight than controls over weeks 3–4, Two-Way ANOVA with Tukey’s post hoc test, results considered significant if p < 0.05. Error bars represent mean (SD)
Studies show that exercising depletes both liver and muscle glycogen faster than fasting [4]. For example, swimming for an hour and a half depletes the same amount of glycogen as a 24-hour fast. However, it's a good idea to eat a tiny amount of carbs and protein before and after a workout to prevent muscle damage. Your body can break down proteins in your muscles if glycogen stores get depleted during workouts.
Im very excited about this product! I received it about a week ago and it helped me break my month+ plateau! I've been on a keto diet since mid-April and had lost 10 lbs but stalled out. Ill be honest, the after taste is not pleasant but I'll take it since it's working. I've lost 12.5 lbs and going strong. Feeling better than ever. Would recommend and buy again!
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.
Supplemental BHB’s are ideal for people new to the ketogenic way of eating. The changes that happen in your brain and body when adapting to a VLC diet are both immediate and profound. For example, our kidney’s start processing minerals salts much more efficiently. Ironically, after years of being advised to decrease our intake of salt (sodium), it turns out that for people transitioning away from the Standard American Diet (SAD diet) towards a lower carb or ketogenic diet there is actually a need to increase dietary mineral salts such as potassium, sodium, magnesium and calcium. During the process of becoming keto-adapted, it is very important to increase your intake of these essential minerals, in order to prevent the onset of unpleasant symptoms (known as “keto flu”).
Another effect of the ketone drinks was to lower blood glucose, free fatty acids, and triglyceride levels. This sounds great. Elevated levels of all those markers are harbingers of disease, particularly if they remain chronically elevated. But think about what this means. If free fatty acids go down, that means adipose tissue isn’t being liberated for burning.

Ketone monoester and diester compounds may circumvent the problems associated with inorganic ion consumption in KS drinks. KE ingestion rapidly increased blood ketone concentrations to >5 mM in animals (Desrochers et al., 1995a,b; Clarke et al., 2012a) and the first oral, non-racemic KE for human consumption, (R)-3-hydroxybutyl (R)-3-hydroxybutyrate, raised blood βHB concentrations to 3–5 mM in healthy adults (Clarke et al., 2012b; Shivva et al., 2016) and athletes (Cox et al., 2016; Holdsworth et al., 2017; Vandoorne et al., 2017). However, the pharmacokinetics and pharmacodynamics of this KE with confounding factors, such as prandial state or multiple KE drinks, have not been characterized.


Ketosis supplements made in poor quality have proven to lead to side-effects such as constipation and increased levels of cholesterol and triglycerides in men. Women may also experience amenorrhea or other disruptions to the menstrual cycle. This is why it is essential to know what combination of compounds you are consuming while you are on this very strict diet. The wrong balance can mess with you in the long term and won't give you the results that you are looking for.
Alright, first of all, I tried every combination available for this product. I really loved the idea of adding it to my morning iced coffee with MCT, 1 tbs of heavy cream and stevia. To be honest, my morning coffee is one of my favorite things throughout my day and I was very dissppointed when it didn’t taste *exactly* like an iced mocha. I found it to be very bitter and tough to finish. Not to mention it was ruining my love for my morning coffee time.
Ketone Bodies are then used by tissues as a source of energy3 through a pathway that leads to formation from β-hydroxybutyrate of two molecules of acetyl CoA, which are used finally in the Krebs cycle. It is interesting to note that the KBs are able to produce more energy compared with glucose because of the metabolic effects of ketosis—the high chemical potential of 3-β-hydroxybutyrate leads to an increase in the ΔG0 of ATP hydrolysis.3 
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]
Effects of ketone supplementation on basal blood ketone and basal blood glucose levels: Rats administered ketone supplements did not have a significant change in basal blood ketone levels (a) or basal blood glucose levels (b) for the four week study. Two-Way ANOVA with Tukey’s post-hoc test, results considered significant if p < 0.05. Error bars represent mean (SD)
Now onto the best ketone supplements. All of these 5 are great products with good customer experiences and reviews. The list contains 3 MCT oil powders and 2 BHB salts. Since it’s just 5 products, there’s no room for bad quality. If you see a lower rating it may be due to price/value, the taste or perhaps a lack of third-party inspection certificates.
These studies were approved by external Research Ethics Committees (London Queen's Square: 14/LO/0288 and South West Frenchay: 15/SW/0244) and were conducted in accordance with the Declaration of Helsinki (2008). Studies took place at the University of Oxford between September 2014 and September 2016. Participants were healthy, aged 21–57, non-smokers and had no history of major illness. Female participants were using oral contraception to minimize the effects of menstrual phase on results. Participants provided written informed consent prior to inclusion, and completed a confidential medical screening questionnaire to determine eligibility. Anthropometric characteristics are shown in Table ​Table1.1. Sample sizes were chosen following an estimated power calculation based on the effect size in previous work using KE drinks (Clarke et al., 2012b; Shivva et al., 2016).
Consuming exogenous ketones isn't the same as following a ketogenic diet–the ketones in the blood haven't been naturally produced by the breakdown of fat stores. However, scientists believe many of the health benefits of the keto diet and fasting (aside from weight loss) are triggered by ketones. Therefore, raising ketone levels through either endogenous or exogenous ketosis could help to improve health and performance by:
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).
Although decreases in FFA, TG and glucose occurred, there were no significant differences between the KE and KS drinks or with intake amount. Ingestion of ketone drinks significantly decreased overall mean plasma FFA from 0.7 to 0.4 mM, TG from 1.1 to 0.9 mM and glucose from 5.7 to 4.8 mM after 1 h (all p < 0.05). Concentrations were the same as at baseline by 4 h, with FFA at 0.6 mM, TG at 0.9 mM and glucose 5.1 mM (Figures 2A–C). There was a rise in insulin concentrations 30 min following all drinks, probably due to the small amount of carbohydrate in the sweetener (Figure ​(Figure2D2D).
So, now that we've established that purchasing BHB supplements directly from the manufacturer is the way to go. Now, let's talk about which ketogenic product you should be buying in the stores. Well, if you read our review about the different exogenous ketone supplements, you will also know that Perfect Keto is rated #1 on our list which was a pretty close race but it came out on top after all the tests that we've performed on all the different products.
If you have already mastered the Very Low Carbohydrate (VLC) or ketogenic way of eating, and/or are eating at a caloric deficit, exercising or fasting you are naturally creating the optimal conditions for your body to produce ketones and put your body into nutritional ketosis. By strict adherence to a well-formulated ketogenic diet (complete with higher levels of mineral salts) you should be able to produce all the ketones you need naturally (endogenously). If you are new or inexperienced in ketogenic eating however; or if you or a family member struggles to adhere to a ketogenic diet, then supplementation with exogenous ketones may be very beneficial. Not only will ketone supplements help to mitigate hunger and carb cravings, but they will also help you stave off carb flu symptoms (see below), giving you the best possible chance of long-term success.
There’s debate raging about which dietary tactic is the god particle for making you leaner, faster and healthier. How the ketogenic diet option squares off against the low carb route is vital for understanding the ways in which exogenous ketone supplements work. To get into ketosis the natural way, you need to keep your carb intake low enough for long enough for your body to begin using use fat as fuel. Your liver then converts a portion of that fat into energy molecules called ketones. These work together with glucose as a fuel source, but can actually kick in faster, allowing your body to operate more economically during lengthy, high-energy exercise efforts.
They’ve got enough science behind them to suggest they do work very well indeed, but watch out for the online ads featuring the raspberry ketone fat burners. Their name is little more than a parlour trick because this is not related in any way to ketones, a ketogenic diet or nutritional ketosis. They are merely the natural substance that gives raspberries their sweet aroma and flavour. Just because they’re marketed at the must-have fat burner, doesn’t mean they work and are one of the most widely spread Internet scams. There aren’t any human studies to back up raspberries claims so exercise a handful of caution when choosing your ketone supplier. Make sure they’re reputable, can be held accountable and are Australian made to set yourself up to become leaner while increasing your stamina.
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

Alright, first of all, I tried every combination available for this product. I really loved the idea of adding it to my morning iced coffee with MCT, 1 tbs of heavy cream and stevia. To be honest, my morning coffee is one of my favorite things throughout my day and I was very dissppointed when it didn’t taste *exactly* like an iced mocha. I found it to be very bitter and tough to finish. Not to mention it was ruining my love for my morning coffee time.


There are many places where you can buy ketone supplements especially online. You have Amazon, Craigslist, and eBay to name a few but the thing with that is, they are often over-priced compared to the actual costs from the direct manufacturer. If you buy ketones directly from the official website of the product or brand, you are likely to get a way better deal than buying from any third-party seller that you might bump into on the internet. 

Serial drinks or a continuous NG infusion of KE effectively kept blood ketone concentrations >1 mM for 9 h (Figure ​(Figure6).6). With drinks every 3 h, blood d-βHB rose and then fell, but had not returned to baseline (~ 0.1 mM) when the next drink was consumed. There was no significant difference in d-βHB Cmax between drinks 2 and 3 (3.4 ± 0.2 mM vs. 3.8 ± 0.2 mM p = 0.3), as the rate of d-βHB appearance fell slightly with successive drinks (0.07 ± 0.01 mmol.min−1 and 0.06 ± 0.01 mmol.min−1 p = 0.6). d-βHB elimination was the same after each bolus (142 ± 37 mmol.min, 127 ± 45 mmol.min; and 122 ± 54 mmol.min). When KE was given via a nasogastric tube, the initial bolus raised blood d-βHB to 2.9 ± 0.5 mM after 1 h, thereafter continuous infusion maintained blood d-βHB between 2–3 mM. Total d-βHB appearance in the blood was identical for both methods of administration (Serial drinks AUC: 1,394 ± 64 mmol.min; NG infusion AUC: 1,305 ± 143 mmol.min. p = 0.6).
That’s not all. Though Prüvit in particular has a legion of fans (the brand has nearly 35,000 Instagram followers and some 256,000 likes on Facebook) and a small team of affiliated medical experts, there’s no hard science on Prüvit or similar products. (Prevention reached out to several Prüvit experts and employees for interviews but did not receive a response.) The research page on the brand’s website does include links to legit scientific studies. But the studies are on the keto diet—not on Prüvit’s products. When it comes to research on the actual supplements, the brand’s website simply says “Human studies on finished products (underway) at various universities and research facilities.” In other words, there’s no scientific evidence available yet to show that they actually work.

Comments are welcomed and encouraged. The purpose of comments on our site is to expand knowledge, engage in thoughtful discussion, and learn more from readers. Criticism and skepticism can be far more useful than praise and unflinching belief. There’s an art and science to critical thinking and how to conduct yourself. There’s a multitude of fallacious appeals we could spell out, but a good rule of thumb is not to attack the person, attack the ideas. Don’t look for the flaws in the person, look for the flaws in the hypothesis. Let’s keep the brawling to movies depicting minor league hockey teams and political “news” shows. Thank you for adding to the discussion.

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Medical Disclaimer: The material on this site is provided for informational purposes only and is not medical advice. Always consult your physician before beginning any diet or exercise program.

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