Second, there are inherent metabolic differences between boosting ketones via diet and boosting ketones via supplements. On a ketogenic diet, ketones go up because you’re converting body and dietary fat into ketone bodies. A rise in endogenous ketones means you’re burning fat and building the requisite machinery to metabolize the new energy source. On exogenous ketones, ketones go up because you ate some ketones; conversion of body and dietary fat into ketone bodies goes down if anything.

Intense exercise -- more than just fidgeting or pacing -- uses ketones, when glucose is in short supply, which means the body has to create more ketones to replace what you use. This is great for those who are used to a moderate to intense activity level, but intensity is a fine dance between encouraging ketone production and elevating cortisol for the rest of us.
Exogenous ketones can lower appetite during a fast. After an overnight fast, normal weight human subjects either drank a ketone ester supplement or a calorie-matched glucose drink. Compared to the glucose drinkers, the ketone drinkers had lower insulin, lower ghrelin, greater satiety, and less hunger. This can be useful for people trying to extend their fast who don’t want to or can’t yet deal with the hunger. You’re still taking in energy, but the metabolic profile remains similar to that of a fasted person.
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.
Let’s briefly discuss some organic chemistry. Two molecules that are “the same” but mirror images of each other (like your hands) are known as enantiomers, a type of spatial isomer. Beta hydroxybutyrate comes in two forms, D-β-hydroxybutyrate (“right-handed”) and L-β-hydroxybutyrate (“left-handed”). D-β-hydroxybutyrate is the form that is naturally produced in the body and is most bioavailable when taken exogenously.
If the claims about the benefits of exogenous ketones are accurate and true, then it’s fantastic news for people who are looking to enhance their keto lifestyle and who have the money to spend. But two of our core values are trustworthiness and goodness, and it is important to us to test assumptions made by marketing claims and help make sure that people are getting what they are told they are getting when they spend money on a product.

We will go deep in the science behind this fascinating diet and then review some of the best exogenous ketone supplements out there in the market. Because without the knowledge and the right information about exogenous ketones that you can properly follow, you might never reach your goals and you may as well keep eating that mashed potato for dinner and club sandwich for lunch.


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.
Geek note: Technically speaking, beta hydroxybutyrate is NOT a legitimate ketone body. Ketone bodies, or ketones are technically molecules with carbonyl carbons which are bonded to two additional carbon atoms. One carbon has four available bonds. When that carbon is double bonded to oxygen and also has two single bonds to carbon, we have a ketone body. If you have a carbon atom that is double bonded to an oxygen (carbonyl group), which is also bound to an -OH group instead of two different carbon atoms, that would be a carboxylic acid, but that really doesn’t matter in this case. For all intents and purposes of the ketogenic diet, betahydroxybutyrate should be considered one of the three ketone bodies and a “ketone” nonetheless. Your body uses BHB pimarily for energy in the state of ketosis, so it’s a ketone, okay?
As repeated KE consumption would be required to maintain nutritional ketosis, we investigated the kinetics of drinks in series and of continuous intra-gastric infusion. During starvation, the accumulation of ketones (>4 mM) reportedly inhibited ketone clearance from the blood, however the underlying mechanism is unknown (Hall et al., 1984; Wastney et al., 1984; Balasse and Fery, 1989). In Study 3, βHB uptake and elimination were identical for the second and third KE drinks, suggesting that βHB may have reached a pseudo-steady state should further identical boluses have been given at similar intervals. Furthermore, when the KE was given at a constant rate via a NG tube, blood ketone concentrations remained ~3 mM. Therefore, repeated KE drinks effectively maintain ketosis at the intervals and doses studied here.

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.


The major determinant of whether the liver will produce ketone bodies is the amount of liver glycogen present (8). The primary role of liver glycogen is to maintain normal blood glucose levels. When dietary carbohydrates are removed from the diet and blood glucose falls, glucagon signals the liver to break down its glycogen stores to glucose which is released into the bloodstream. After approximately 12-16 hours, depending on activity, liver glycogen is almost completely depleted. At this time, ketogenesis increases rapidly. In fact, after liver glycogen is depleted, the availability of FFA will determine the rate of ketone production. (12)
Exercise or performing an extensive workout during the day is a perfect way to burn all those glycogen reserves in your body. Performing a HIIT or High Intensity Interval Training is a perfect type of exercise to do this. So, the next morning when you are awake, get set on an intense exercise session (remember, in the morning, not the afternoon). This will keep the cortisol level lowered during the evening when you wish to have some rest.
You must realise that our bodies are lazy and switching to a new energy source means hard work, that means that your body will not do this easily and you basically have to force it. One way to speed up this process is to put your body into fight or flight mode. My preferred  controlled exercise to do this is to have a high intensity workout followed immediately by a  cold shower.  I am describing it in the article to go slowly, but in this case it will actually be beneficial if you can force your self to go straight into a cold shower and try to stay there at least 2 minutes. One of the benefits of this that your body will produce the hormone noradrenaline. Obviously this is something for people in perfect health. Please advice your doctor before you want to take cold showers.
Electrolyte Imbalance – The physiological reasoning behind electrolytes becoming depleted during a state of ketosis is due to lack of water retention and frequent urination. When supplementing with exogenous ketones, the acute state of ketosis will likely increase the frequency of urination, but it won’t deplete glycogen stores. Therefore, it may be useful to drink an electrolyte solution if you are urinating a lot after taking exogenous ketones, but it’s dependent upon how you feel.
Hi! I have what might be a silly question about using these supplements. What happens if you are taking them and your diet goes off the rails, like you take the Keto//OS and then eat a bunch of pizza or chocolate. Does your body just immediately revert back to using the carbs for energy instead of the ketones? Or, if it doesn’t, would that mean your body would just store those carbs as fat? I realize that ideally you wouldn’t eat the pizza, but sometimes I do and I worry about what exactly I’m doing to my body if I’ve also taken ketones.
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, and women may also experience amenorrhea or other disruptions to the menstrual cycle. This is why it is really important to know what combination of compounds you are consuming, particularly while you are on this very strict diet because the wrong balance can really mess with you in the long term and won't give you the high performance that you are looking for. 

Interest in the ketogenic diet is at an all-time high, and for good reason. It’s a great way to lose body fat, gain steady energy throughout the day, increase fat-burning capacity at rest and during exercise, reduce inflammation, and improve cognitive function. Keto also has a number of promising medical applications, including seizure control, enhanced efficacy of chemotherapy, and abatement of age-related cognitive impairment.


Other ingredients: Many of the supplements contain large amounts of caffeine – the supplement we tested from Prüvit contains the same amount as a 16 oz cup of coffee! Some supplements also contain malic acid, which is “known for its ability to increase energy and tolerance to exercise”. This leaves the nagging doubt: if the experiment shows an increase in energy and physical performance, for example, how do we know it is the (expensive) BHB causing the effect and not the (inexpensive) other ingredients?

Zenwise, you should consider offering this through an email subscriber list to gain **more** loyal (& repeat) customers by offering them better prices. We all know it's cheaper to find ways to keep customers than to go out and find new ones (about 5x cheaper in fact!), plus my guess is Amazon is getting 30% margin AT LEAST). If I saw that you offered a 25% discount when buying directly, I'd keep using the product.


The keto-esters are more appropriate for delivering higher doses of BOHB, but with repeated dosing can push the limits of taste and GI tolerance. There has been fairly extensive research on a compound 3-hydroxybutyl 3-hydroxybutyrate that is converted via hydrolysis and liver metabolism to yield 2 molecules of ketones, presumably mostly D-BOHB (Clarke 2012 and 2014). In a study involving lean athletes, an approximate 50 gram dose raised blood BOHB levels to 3 mM after 10 min and reached 6 mM by 20 min. Submaximal exercise resulted in increased ketone disposal from 2 to 3 hours and contributed significantly to whole body energy use during exercise (Cox 2016). This product has been shown to significantly reduce appetite after a single dose (Stubbs 2018) but its effect on body weight in humans over a longer period of time has not been studied, nor has its effect on blood glucose control been reported in humans with type 2 diabetes. However a single dose prior to a glucose tolerance test in healthy humans reduced blood glucose area-under-curve by 11% and non-esterified fatty acid area-under-curve by 44% (Myette-Cote 2018).

That said, there also remains the question of the relative benefits of AcAc versus BOHB, both as independent signaling molecules and as redox modulators in peripheral (aka non-hepatic) tissues. Seen from this perspective, AcAc generated in the liver acts as a NAD+ donor for the periphery, whereas pure BOHB taken orally, to the extent that it is retro-converted to AcAc (Sherwin 1975), potentially deprives the periphery of NAD+.


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.
Intense exercise — more than just fidgeting or pacing — uses ketones, when glucose is in short supply, which means the body has to create more ketones to replace what you use. This is great for those who are used to a moderate to intense activity level, but intensity is a fine dance between encouraging ketone production and elevating cortisol for the rest of us.
Appetite suppression: Appetite was measured in 10 males and 5 females after consuming a ketone ester (KE) or a dextrose (DEXT) drink . Desire to eat and perception of hunger dropped after both drinks, but the KE was 50% more effective for 1.5-4hrs. Insulin levels rose for both drinks but were 3x less with the KE drink after 30mins (Fig 2). The hunger hormone, ghrelin, was significantly lower between 2 to 4 hours after drinking the KE (Fig 2). In conclusion Ketone esters delay the onset of hunger and lower the desire to eat. 8
Directions — — As a dietary supplement, mix 1 scoop of ketone powder with 8-12 oz of water To avoid gastrointestinal discomfort, start with 1/2 scoop (or even less) and gradually increase to a full serving. Best consumed prior to exercise to enhance performance. Do not exceed 3 scoops per day. As a dietary supplement take 1 serving of PX Ketotropin twice daily. Ideally the 1st servings (4 capsules) should be taken prior to the first meal of the day. Consume 2nd serving 30 minutes prior to strenuous physical activity. If no physical activity is performed please consumer 2nd serving prior to afternoon meal. Additional servings can be taken in between meals throughout the day if needed. Do not consume more than 6 servings of PX Ketotropin

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