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.
Fortunately, you don’t need to be a dietary math savant to cash in on these rewards because the supplement eggheads took the liberty of creating exogenous ketones, which act as direct substitutes to the ones your body creates. Unlike other fat burners that give you the skits jitters, these are actually helping exercisers reach new personal bests while getting leaner, and are totally legal. Here’s what you need to know to get a slice of the action safely.
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.
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
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.
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.
Relationship between blood ketone and glucose levels: a BMS + MCT (5 g/kg) supplemented rats demonstrated a significant inverse relationship between elevated blood ketone levels and decreased blood ketone levels (r2 = 0.4314, p = 0.0203). b At week 4, BMS + MCT (10 g/kg) and MCT (10 g/kg) showed a significant correlation between blood ketone levels and blood glucose levels (r2 = 0.8619, p < 0.0001; r2 = 0.6365, p = 0.0057). Linear regression analysis, results considered significant if p < 0.05
Uncontrolled diabetics may face some risks in using exogenous ketones. This is because when the body is unable to produce insulin (type I diabetics and extreme type II diabetics), it is unable to get sugar or glucose into the cells.  Therefore, the body will start producing ketones.  If these individuals do not use an insulin injection, they can overtime build up unsafe levels of ketones (6).
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.
Hi Acadia, just want to clear up a few things you noted in your post: The manufacture of BHB salts involves ionic bonding of an anion (beta-hydroxybutyrate) with a cation (Na+, K+, Ca+, Mg+). At least one of the exogenous ketone products you listed does in fact contain potassium ions. People taking potassium-sparing drugs need to know this and that raises concerns about leaving it off your chart. Some people are genuinely sodium sensitive even to small amounts of salt added to otherwise healthy foods. This can hold true even for those following ketogenic diets. The term you’re looking for… Read more »
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!
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.
For the past few million years, the only way for humans to make use of ketones for fuel was to restrict carbohydrates low enough and long enough to induce the liver to make them. This is admittedly hard for many people to do in a world that still believes that dietary carbs are good and fats are bad. An emerging alternative is to consume ketones as a dietary supplement. The research into how these function in the body and what benefits they can confer remains early stage, but there are already a number of such products available for sale. In this section, we will discuss how exogenous ketones affect blood ketone levels, and how they may influence health and disease compared to ketones produced within the body.
In a subset of participants (n = 7) the effect of 3.2 mmol.kg−1 of βHB as KE and KS on blood pH and electrolytes after ketone drinks was investigated. Blood d-βHB kinetics were similar to those in the initial experiment (Figure ​(Figure3A).3A). After 60 min, blood pH declined from 7.41 to 7.31 following a KE drink (p < 0.001, Figure ​Figure3B).3B). Bicarbonate fell significantly from 23.6 ± 0.7 to 17.0 ± 0.8 mM following KE drinks (p < 0.001), but remained within the normal range (Figure 3C). Both ketone drinks significantly decreased blood potassium concentrations by 0.7 mM (both drinks p < 0.05, Figure 3D) and increased sodium and chloride concentrations (Sodium: both drinks p < 0.05, Chloride: KE = p < 0.05, KS = p < 0.005, Figures 3E,F).
Once the body is able to generate energy with the help of exogenous ketones which are present in the bloodstream, it would start looking for other sources of ketones. This would encourage the body to tap into the vast reserve of fat which is accumulated in the body. Thus, the process of ketosis is accelerated when you consume extra exogenous ketones. This also leads to quicker weight loss and the body entering ketosis faster.
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.
BS, KC, and PC designed the research studies. BS, PC, RE, SM, and PS carried out the studies. SH provided the gas analyser used in the study on behalf of NTT DOCOMO Inc. BS, MS, and SM analyzed the data and performed statistical analysis in collaboration with JM. BS wrote the paper with help from KC, PC, and OF. KC had primary responsibility for final content. All authors read and approved the final manuscript.
If you are not on a vigorous exercise plan, I wouldn't go more than about a scoop a day (if you are a 30min/day, low carb person like me) because some of the research available says that if you get into ketosis using diet only and supplement with extra ketones, you may experience a slower rate of weight loss since you are getting your ketones from a supplement rather than the body transforming fat to ketones. As I progress, I will probably move up to 2 scoops per day.
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.  
Hi.. I’ve recently started drinking Keto OS Max and have lost about 20 pounds in the past 4 weeks without strictly sticking to the keto diet and have not exercised once. The only issue I have with Keto OS is the price really. I am wondering how the other BHB/MCT products like Ketond and PerfectKeto compare to Keto OS and what product on the market comes closest to the Keto OS recipes beneficial ingredients. TIA
A meal high in carbohydrate and calories significantly decreased peak d-βHB by ~ 1 mM (Figure ​(Figure4A)4A) and reduced the d-βHB AUC by 27% (p < 0.001, Figure ​Figure4B).4B). There were no significant changes in d-βHB Tmax (fed = 73 ± 6 min vs. fasted 66 ± 4 min). Despite the differences in d-βHB kinetics after the meal, there were no effects of food on urinary ketone excretion (Figure ​(Figure4C),4C), plasma AcAc (Figure ​(Figure4D)4D) or breath acetone (Figure ​(Figure4E)4E) following KE ingestion. Plasma AcAc kinetics followed a similar time course to d-βHB, with the ratio of blood d-βHB: AcAc being 6:1 when KE drinks were consumed whilst fasted, and 4:1 following the meal. As observed in Study 1, breath acetone concentrations rose more slowly than blood ketone concentrations, reaching a plateau at 150 min and remaining elevated for at least 4 h (Figure ​(Figure4E4E).
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.

But there have also been studies done showing that the Inuit Eskimo’s do not actually reach a state of ketosis. This is due to numerous factors. One being that the diet the eskimo’s eat ‘would not be expected to cause ketosis, because the calculated anti-ketogenic effect of the large protein ingestion was somewhat more than enough to offset the ketogenic effect of fat plus protein.” 


To be in ketosis, you need to get very specific about the macronutrient ratios hanging off your fork. This means eating 75% fats, 20% protein and 5% carbohydrates. It’ll see you getting 5-10% of your total calories from carbohydrates, which is roughly 25-30g of carbs per day, and diligently keeping this below the 50g threshold creates the ketosis that burns stored fat. Unlike the no-limit-protein option on the table when going low carb, eating more than 0.67-0.81g of protein per pound of bodyweight can hoof you out of ketosis because too much of it can be converted into glucose, blunting the benefits of the ketones. On the plus side, you will have a high fat intake, making your energy levels more balanced so you can train at higher intensities.
Safety Warning — KEEP OUT OF REACH OF CHILDERN. This product is only intended to be consumed by healthy adults 18 years of age or older. Do not use if you are pregnant, trying to become pregnant, breast feeding, have known medical conditions (including but not limited to diabetes, kidney, heart, or liver disease) or are taking prescription or OTC medication(s). Consult with your health care practitioner before using this product These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. —

On day 29, rats were sacrificed via deep isoflurane anesthesia, exsanguination by cardiac puncture, and decapitation 4–8 h after intragastric gavage, which correlated to the time range where the most significantly elevated blood βHB levels were observed. Brain, lungs, liver, kidneys, spleen and heart were harvested, weighed (AWS-1000 1 kg portable digital scale (AWS, Charleston, SC)), and flash-frozen in liquid nitrogen or preserved in 4 % paraformaldehyde for future analysis.
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.

Ketosis is a unique metabolic state where your body burns fat instead of glucose for fuel. Glucose is a simple sugar molecule derived from carbohydrates. Your body prefers using glucose to using fat and protein to make energy. This is because glucose it is easy to burn as it doesn't require much energy. On the other hand, your body uses fat and protein to build and repair tissue and make hormones.
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.
Zenwise Health Keto BHB is an exogenous ketone supplement that features goBHB, an innovative beta-hydroxybutyrate complex that supports the body's fueling processes through nutritional ketosis to promote peak mental and physical performance. Great for reaching ketosis fast, to max out your pre-workout routine, while also promoting overall high-performance, brain function, and maximum endurance. This Keto powder formula features a Raspberry Lemonade flavor that will mix and shake well with any water based drink. Best of all, this BHB is formulated with absolutely no carbs or caffeine for clean energy. Simply mix this BHB powder with water-based drinks or your favorite fruit flavored drink or smoothie, and enjoy.

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