Importantly, at Diet Doctor we do not think you need to spend any extra money at all in order to revolutionize your health. You can achieve radiant health just by enjoying authentic food that is naturally low in carbohydrates, getting plenty of sleep and some exercise (going for a walk is free) and reducing stress. A lot of you who answered the survey made exactly these points in your explanations of reasons for not taking the supplements. I whole-heartedly agree.

Price: The supplements are expensive – very expensive. At the top end, if you follow Prüvit’s guidelines on “getting in the n8tive zone” (which is such a gimmicky marketing slogan it almost makes me cringe), you will require 2 servings of their Keto-OS product per day. This means around 60 servings per month, which will set you back a whopping $390 per month if you buy direct from their website! In the case of Prüvit, this is in part due to the multi-level marketing structure they operate under.
I don’t recommend that you go straight for a 1-2 day fast, but begin by restricting yourself to certain eating windows. Typically people restrict themselves to the hours of 5pm – 11pm. People often refer to their fasting windows by numbers: 19/5 or 21/3, for example, means 19 hours of fasting and 5 hours eating or 21 hours fasting and 3 hours eating, respectively.
At baseline, 4 h after intragastric gavage, the elevation of blood ketones was inversely related to the reduction of blood glucose compared to controls following the administration of MCT (5 g/kg) (p = 0.008) and BMS + MCT (5 g/kg) (p = 0.039) . There was no significant correlation between blood ketone levels and blood glucose levels compared to controls for any other ketone supplemented group at baseline (Fig. 4a). At week 4, 4 h after intragastric gavage, there was a significant correlation between blood ketone levels and blood glucose levels compared to controls in MCT (10 g/kg) and BMS + MCT (10 g/kg) (p < 0.0001, p < 0.0001) (Fig. 4b).

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?’

For anyone who wants to get a bit more technical, research by Stubbs and colleagues shows that BHB shuts off lipolysis (fat breakdown). With endogenous ketosis there are many other factors that stimulate lipolysis meaning that a kind of balance is reached and lipolysis stays constant. But with exogenous ketosis those factors stimulating ketosis are not present, so the overall effect of the ingested BHB is to decrease lipolysis.

Dominic D’Agostino has two in-depth interviews on The Tim Ferriss Show (Part 1, Part 2). Discussion includes exogenous ketones for mitigating the onset of neurodegenerative diseases, using ketones in place of fasting for chemo-protection, benefits of ketone supplementation when consuming carbohydrates, the risks and potential toxicities of ketones.
Those of you who have tried this form of weight loss before are probably more than aware of how hard it can be to first get your body to adapt to such a dramatic change in your daily intake of food, let alone without the help of a single exogenous ketone supplement. And the situation isn’t made any easier if you use a poor quality ketosis supplement because the wrong ketone product may actually do you more harm than good.
Ketone supplements contain exogenous ketones—synthetic ketones made in a lab. Most use a type of ketone called beta-hydroxybutyrate (BHB), which is the same as the ketones the body produces naturally. “We’re literally biohacking," says Amie Heverly, who began taking a ketone supplement called Prüvit last year and now works as a promoter selling Prüvit products. "You’re not adding a foreign substance to your body, because BHB is identical to what your body would naturally produce,” she explains.
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.

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.


Animal procedures were performed in accordance with the University of South Florida Institutional Animal Care and Use Committee (IACUC) guidelines (Protocol #0006R). Juvenile male Sprague–Dawley rats (275–325 g, Harlan Laboratories) were randomly assigned to one of six study groups: control (water, n = 11), BD (n = 11), KE (n = 11), MCT (n = 10), BMS (n = 11), or BMS + MCT (n = 12). Caloric density of standard rodent chow and dose of ketone supplements are listed in Table 1. On days 1–14, rats received a 5 g/kg body weight dose of their respective treatments via intragastric gavage. Dosage was increased to 10 g/kg body weight for the second half of the study (days 15–28) for all groups except BD and KE to prevent excessive hyperketonemia (ketoacidosis). Each daily dose of BMS would equal ~1000–1500 mg of βHB, depending on the weight of the animal. Intragastric gavage was performed at the same time daily, and animals had ad libitum access to standard rodent chow 2018 (Harlan Teklad) for the duration of the study. The macronutrient ratio the standard rodent chow was 62.2, 23.8 and 14 % of carbohydrates, protein and fat respectively.

The USDA guidelines recommend less than 2400 mg of sodium per day for healthy adults, and 1500 mg or less for individuals over the age of 50 or at risk for hypertension[2]. For reference, 2300 mg of sodium is the equivalent of about one teaspoon of salt.  Even though these recommendations are promoted by the American Heart Associated and other health-related organizations, recent research has claimed that there is simply not enough evidence to support these guidelines[5]. Worldwide 24-hour urinary sodium excretion data suggest that the normal range is actually 2500-5000 mg per day, which is what most of us consume daily[6]. Additionally, people with high activity levels or chronically low blood pressure may require more sodium than the average person.
I began by simply playing all of the games over and over again (each game many dozens of times over the period of a week) to remove any “learning effect.” I then selected two games from each category (for a total of 10 games) and for a period of five days prior to “ketone-day” played each game five times each day. My “before ketones” baseline scores put me in the top 4% of all Lumosity users, so I was already in a good place. But could I improve even more, just one hour after consuming the ketones?

That’s not to say that the supplements don’t work. They very well might. But they could also be useless—or even dangerous, says Christine Palumbo, RDN, Nominating Committee member for the Academy of Nutrition and Dietetics. As of right now, there’s no way to know. “Currently, there’s just not enough evidence from research studies to answer those questions,” Barnes adds.


We designed a test for each of the chosen benefit claims and enlisted the help of four of our Diet Doctor teammates to try out the supplements and go through the testing. They were Jonatan and Giorgos from the video team, Emőke from the recipe team and Erik from the IT team. We had a mix of people who were naturally in endogenous ketosis during testing, and people who were not.
Lots of good info but some things are just plain wrong. It takes 2 days max to get into ketosis if you stop eating carbs. Your body can only store roughly 2 days worth of glycogen. When those stores are exhausted your body will immediately turn to fat. It may take a week or several weeks to get “keto adapted” but it simply won’t ever take you more than 2 days to get into a state of ketosis.
The blood levels of BOHB that can be achieved with the salts or ester formulations are in the 1-3 mM range, similar to what can be achieved with a well-formulated ketogenic diet in insulin sensitive humans, but well below levels achieved after a 4-7 days of total fasting (Owen 1969). In more insulin resistant humans, the ester formulation may deliver higher blood levels than a sustainable diet (as opposed to short term fasting). For example, in the Virta IUH Study of over 200 patients with type 2 diabetes, blood ketone mean levels were 0.6 mM at 10 weeks and 0.4 mM after 1 year.

But some people chose to use supplements to benefit from ketosis (Therapeutic Ketosis), and finally there is the MCT Ketogenic Diet – which in a form of nutritional ketosis (ULC, limited protein, high fat) with a twist – about 30-60% of the fat intake in the diet comes from MCT (Medium Chain Triglyceride) fats. Sources of MCT fats include Pure MCT Oil, Coconut oil and coconut products. The MCT Ketogenic Diet is often used with epilepsy suffers, as the high levels MCT oil create a higher level of ketones in the blood – which helps prevent seizures.

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.


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.
Every 7 days, animals were briefly fasted (4 h, water available) prior to intragastric gavage to standardize levels of blood metabolites prior to glucose and βHB measurements at baseline. Baseline (time 0) was immediately prior to gavage. Whole blood samples (10 μL) were taken from the saphenous vein for analysis of glucose and βHB levels with the commercially available glucose and ketone monitoring system Precision Xtra™ (Abbott Laboratories, Abbott Park, IL). Blood glucose and βHB were measured at 0, 0.5, 1, 4, 8, and 12 h after test substance administration, or until βHB returned to baseline levels. Food was returned to animals after blood analysis at time 0 and gavage. At baseline and week 4, whole blood samples (10 μL) were taken from the saphenous vein immediately prior to gavage (time 0) for analysis of total cholesterol, high-density lipoprotein (HDL), and triglycerides with the commercially available CardioChek™ blood lipid analyzer (Polymer Technology Systems, Inc., Indianapolis, IN). Low-density lipoprotein (LDL) cholesterol was calculated from the three measured lipid levels using the Friedewald equation: (LDL Cholesterol = Total Cholesterol - HDL - (Triglycerides/5)) [51, 52]. Animals were weighed once per week to track changes in body weight associated with hyperketonemia.
“Imagining that everyone is going to go on a ketogenic diet is very unlikely. I’ve done it myself, and it is hard as a diet to sustain for a long period of time,” said Verdin. “The interest for us in BHB is [if] can we recapitulate all the beneficial effects that we are seeing from the ketogenic diet simply by administering BHB as a food or as a drug, whatever you want to call it.”
I’m already following a ketogenic diet and have been fat adapted for about 3 months. Since I’m already in ketosis would this product help me or hinder my fat loss? My thought is that if I’m already in a fat burning state and then I take exogenous ketones does my body stop burning my fat to burn the ingested ketones like taking a break or does the product enhance the fat burning that is already taking place?
Yes — you read that correctly — 24 hours of intermittent fasting without any resistance training and these subjects were able to preserve more muscle mass than the subjects that ate fewer calories every day without fasting at all. This finding contradicts our common sense, but when we dig deeper into autophagy we can find the mechanism behind this result.
For example, the popular Raspberry Ketones supplement is far different than what we have been discussing in this article. Raspberry ketones are unrelated to the ketones that are produced in the body and are not the same as the ketone salts that have been covered above. There are some limited studies that indicate raspberry ketones may be helpful for weight loss, but they are inconsistent. Raspberry ketones are the molecules that give raspberries their scent and flavor, and in some cases, aren’t even derived from raspberries at all.
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]
That’s not to say that the supplements don’t work. They very well might. But they could also be useless—or even dangerous, says Christine Palumbo, RDN, Nominating Committee member for the Academy of Nutrition and Dietetics. As of right now, there’s no way to know. “Currently, there’s just not enough evidence from research studies to answer those questions,” Barnes adds.

BHB supplementation can drastically enhance your insulin sensitivity, resulting in better shuttling of blood glucose into cells.[10] With type-2 diabetes and insulin resistance becoming growing concerns, BHB supplementation may provide a promising alternative for healthy blood glucose regulation in the coming years.Even for everyday gym goers and fitness enthusiasts, increasing insulin sensitivity via BHB supplementation can be a great benefit as this puts your body in a better position for partitioning nutrients/carbohydrates to energetically demanding, glycolytic tissues, such as skeletal muscle.
Personally, I do this on Friday night to Saturday night, so if something happens and my hunger hasn’t crashed by Sunday morning, I have another day that I can go zero carb to keep the momentum going. While the body will trigger ketosis as soon as you run out of glycogen, hunger is attached to your triglyceride and insulin levels, which might take an extra day to normalize.

Spatial orientation (also known as sense of direction) involves being aware of the surrounding environment. The game involves navigating a penguin through a two-dimensional maze (up, down, left, right) to get to a fish. As the penguin moves through the maze, the entire screen periodically rotates to another orientation, so “up” for the penguin then becomes, say, “left” to the player, who must quickly adapt to the navigation controls.
Ketone Salts: While the body uses and makes BHB ketones salts naturally, in supplement form ketone salts are synthetically (lab) made compounds that combine sodium (and/or potassium, calcium, or magnesium) with BHB. The salt is used to raise the pH and make things less acidic. Currently, all ketone supplements on the market are made from ketone salts. While they raise ketone levels, most people will only experience mild nutritional ketosis (~0.6-1.0 mmol/L).
The famous keto-breath is powerful enough to throw shade on your increasingly ripped rig. The mouth-based ketones are released when your body scalds fat are responsible for the pong. Going into ketosis by changing your diet means your body doesn’t have carbs as a fuel source, so you’re using fats and proteins for energy, which fuels the potency of the fireworks seeping from your grill. The same can happen when taking supplements, but not by the same degree – proving that changing your diet it obviously a more potent fat burning tool. A lot of people also report gastric distress, so you could offend those you’re co-habituating with. What’s more, they can have a slight diuretic effect, which can deplete your magnesium, potassium and sodium stores, so make sure your levels are topped up when you’re out for a extra long exercise stint. Research in Nutrition and Metabolism on animals, found there were no negative side effects, but whether this extends to humans is still up for discussion. Fortunately, you’re more likely benefit from the upsides such as improved endurance, appetite suppression and fat burning.

Though research involving ketone supplements is still in the early stages, it seems promising. One study published in February 2018 in Obesity suggests exogenous ketone esters lower hunger hormones and act as appetite suppressors. That can lead to weight loss because “if we don’t feel hungry, gosh, we probably aren’t going to eat like we were,” Griffin says.
North Americans typically live pro-inflammatory, pro-disease lives (think about your everyday: likely sitting in a flexed position for hours on end, not enough natural sunlight, not enough movement, artificial food stuffs, artificial colouring, going to bed late, blue light exposure, less in-person contact with our loved ones, late night snacks, the list goes on and on).
Keto dieters love exogenous ketones because they help fight the keto flu and get you quickly into ketosis. One study found that taking drinks with exogenous ketones lowers blood levels of glucose, free fatty acid, and triglycerides [8]. The study concluded that exogenous ketones are a practical and effective way to achieve ketosis. Taking exogenous ketones longer will also speed up the process of keto-adaptation.

Blood, urine, plasma, and breath ketone concentrations following mole-matched ketone ester or isocaloric dextrose drinks in fed and fasted subjects (n = 16) at rest. Data from both of the two study visits in each condition (fed and fasted) completed by an individual are included in the analysis. Values are means ± SEM. (A) Blood d-βHB. (B) AUC of blood d-βHB. (C) Urine d-βHB excretion. (D) Plasma acetoacetate (AcAc). (E) Measured breath acetone (ppm = parts per million). (F,G) Mean d-βHB Cmax and difference between βHB Cmax over two visits when subjects separately consumed two ketone ester drinks in both the fed (F) and fasted (G) state. X axis = mean d-βHB Cmax of the 2 visits (mM), Y axis = difference between d-βHB Cmax in each visit. 95% confidence limits are shown as dotted lines. Significance denoted by: *p < 0.05 fed vs. fasted.
A sound sleep is highly associated with the dark. Also, studies have proven that our body’s natural defense mechanisms against cancer cells get activated in the absence of light (that’s why sleeping is the best way to natural healing). So turn off all the lights, TV screen, lamps, and all other light emitting devices at least 30 minutes before going to sleep. With this trick, you are actually preparing yourself to fall asleep.
Possible GI distress (flatulence) at exceptionally high doses –  In the studies referenced in this article, exogenous ketones taken in large doses occasionally resulted in GI distress, especially flatulence. However, the cause of this is hypothesized to be due to the fact that ketones were mixed in a milky fluid that wasn’t very palatable. If you’re taking a nominal dose of exogenous ketones the likelihood of GI distress is rather low. Moreover, if some GI distress is prevalent, it should improve as you become accustomed to taking ketones.
The metabolic phenotype of endogenous ketosis is characterized by lowered blood glucose and elevated FFA concentrations, whereas both blood glucose and FFA are lowered in exogenous ketosis. During endogenous ketosis, low insulin and elevated cortisol increase adipose tissue lipolysis, with hepatic FFA supply being a key determinant of ketogenesis. Ketone bodies exert negative feedback on their own production by reducing hepatic FFA supply through βHB-mediated agonism of the PUMA-G receptor in adipose tissue, which suppresses lipolysis (Taggart et al., 2005). Exogenous ketones from either intravenous infusions (Balasse and Ooms, 1968; Mikkelsen et al., 2015) or ketone drinks, as studied here, inhibit adipose tissue lipolysis by the same mechanism, making the co-existence of low FFA and high βHB unique to exogenous ketosis.

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.


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.
However, with the ketone esters, the effects are nearly immediate, and my entire body was humming throughout the entire day, but not in a jittery way. I was full of mental and physical energy that lasted without any sort of crash (it was a gradual taper). During my cognitive tests, things felt almost effortless as I played the various games. After my experiment was complete I continued writing code for several hours, then went to the gym to work out. I did forget to each lunch though, so there must be some suppressive effect on appetite.
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.”
Baseline measurements showed no significant changes in triglycerides or the lipoproteins (data not shown). Data represent triglyceride and lipoprotein concentrations measured after 4 weeks of daily exogenous ketone supplementation. No significant change in total cholesterol was observed at 4 weeks for any of the ketone treatment groups compared to control. (Fig. 1a). No significant difference was detected in triglycerides for any ketone supplement compared to control (Fig. 1b). MCT supplemented animals had a significant reduction in HDL blood levels compared to control (p < 0.001) (Fig. 1c). LDL levels in ketone-supplemented animals did not significantly differ from controls (Fig. 1d).
Exogenous ketones are also for those just looking to try it out. It lets anyone be able to access ketones simply by consuming these exogenous forms of ketones. Technically, MCTs are not an exogenous ketone such as BHB salts. They’re not ketones. But they readily convert into ketones. So MCT oils and powders are a great source of endogenous ketones. The end result is similar, and thus this top 5 list includes MCT oil powders as well as BHB salts.
Funding. This work supported by an Industrial DPhil Fellowship to BS from the Royal Commission for the Exhibition of 1851. JM was supported by the EPSRC Doctoral Training Centre and Prize Fellowship; Ref: EP/M508111/1. The funding sources were not involved in the design, conduct or analysis of this study. TΔS Ltd. provided the ketone ester, ΔG®, and NTT DOCOMO Inc. provided the acetone meter for the study.
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