How Much Dextrose Should You Take Post Workout?

Most people doing moderate-to-intense training benefit from roughly 0.5 to 1.2 grams of dextrose per kilogram of bodyweight after a workout, depending on how long and hard the session was. For a 75 kg (165 lb) person, that translates to somewhere between 40 and 90 grams. But the “right” amount depends on far more than bodyweight alone, and the fixation on dextrose specifically may be slightly misplaced given what the research actually shows about different carbohydrate sources.

Why Dextrose Gets Recommended in the First Place

Dextrose is just another name for glucose, the sugar your muscles use most directly to rebuild their energy stores after exercise. It has a very high glycemic index, which means it enters your bloodstream fast and triggers a strong insulin response. That insulin spike is the main reason dextrose became the go-to post-workout carb: insulin helps shuttle glucose into muscle cells and also signals those cells to ramp up protein synthesis. Research has consistently shown that high-glycemic carbs refill muscle glycogen faster than low-glycemic ones. In one study, subjects who ate high-glycemic foods after prolonged exercise restored significantly more muscle glycogen over 24 hours than those eating low-glycemic foods, storing about 106 mmol/kg versus roughly 72 mmol/kg in their muscles.

How Much Glycogen You Actually Burn

The amount of dextrose you need is directly tied to how much glycogen you burned during the workout. A 45-minute strength session and a two-hour endurance ride deplete your stores very differently, and loading up on 90 grams of sugar after a light workout is overkill for most people.

A recent systematic review and meta-analysis of resistance training found that a single session depletes glycogen in the working muscles by an average of about 104 mmol/kg of dry muscle mass. But the range is enormous. Sessions with more total sets caused greater depletion, as did longer sessions. Interestingly, higher-intensity lifting (heavier loads, fewer reps) depleted less glycogen per set than moderate-intensity, higher-volume work. Untrained lifters also tended to burn through slightly more glycogen than trained ones.

Endurance exercise is a different story. A long run, bike ride, or swim at moderate intensity can burn through the majority of your muscle glycogen, easily exceeding 300-400 mmol/kg in some cases. If you just did a heavy but brief powerlifting session with low total volume, you might only need 30-50 grams of dextrose. If you ran for 90 minutes, you’re looking at the upper end of the range or beyond. Match the dose to the demand rather than defaulting to a fixed number.

Combining Dextrose with Protein

Taking dextrose by itself misses part of the picture. Adding protein to your post-workout carbs produces a stronger insulin response and supports muscle repair at the same time. In a study of 40 resistance-trained subjects, those who consumed 40 grams of whey protein alongside 120 grams of carbohydrate saw insulin levels spike dramatically compared to an unsupplemented control group. The peak insulin values for the carbohydrate-plus-protein groups reached roughly 136-155 µIU/mL within 30 minutes, while the control group barely budged at around 9 µIU/mL.

What’s worth noting from that same study is that the type of carbohydrate didn’t matter much for the insulin response. Whether subjects received sucrose, honey powder, or maltodextrin alongside their whey protein, the peak insulin and total insulin response were statistically similar. The takeaway: if you’re already pairing carbs with a solid protein dose, obsessing over whether your sugar is dextrose versus another high-glycemic carb is splitting hairs. The protein itself contributes to the insulin signal. A practical post-workout shake for most people might contain 20-40 grams of protein and 40-80 grams of a high-glycemic carbohydrate, adjusted based on session intensity and bodyweight.

Dextrose Versus Maltodextrin and Other Sugars

Dextrose is popular, but maltodextrin (a glucose polymer made of linked glucose molecules) is arguably a better practical choice for large post-workout doses. The reason comes down to your gut. Pure dextrose dissolved in water creates a high-osmolality solution, meaning it draws water into your intestines, which can cause bloating, cramping, and nausea at the doses athletes need. Glucose polymer solutions like maltodextrin deliver the same amount of glucose with much lower osmolality because each molecule of maltodextrin contains many glucose units but exerts less osmotic pressure than the equivalent number of free glucose molecules.

Research on gastric emptying supports this. When subjects drank glucose solutions versus glucose polymer solutions of equal carbohydrate concentration after exercise, the glucose emptied from the stomach significantly slower, likely because of its higher osmolality. Sucrose and glucose polymer emptied at nearly identical rates.

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Early glycogen refilling may actually be faster with a high-molecular-weight glucose polymer. One study found that in the first two hours after exercise, glycogen resynthesis was significantly higher with a specially engineered high-molecular-weight glucose polymer compared to a standard glucose drink, though the difference evened out over four hours.

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If you can tolerate dextrose without stomach issues, it works fine. But if you’re mixing 60-plus grams of powder into a shaker bottle, maltodextrin will almost certainly sit better. Many commercial “post-workout carb” products are maltodextrin for exactly this reason, even if the marketing emphasizes other ingredients.

What About Adding Fructose?

Some post-workout formulas include fructose alongside glucose, and there’s a legitimate reason for that, though it’s not about muscle glycogen. Glucose and fructose are absorbed through different transporters in your intestine. Glucose goes through one transporter (SGLT1) while fructose primarily uses another (GLUT5). This means combining the two can increase total carbohydrate absorption, because the glucose transporter has a capacity ceiling that fructose doesn’t compete with.

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For muscle glycogen specifically, though, adding fructose to glucose doesn’t help. A review on this topic found that glucose-fructose mixtures do not further enhance muscle glycogen replenishment over glucose alone. Where fructose shines is in liver glycogen: liver replenishment rates roughly doubled when subjects consumed glucose-fructose mixtures compared to glucose polymers alone.

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If you train again within eight hours, restoring liver glycogen can matter for your next session’s performance. But if you’re just hitting the gym once a day, pure dextrose or maltodextrin covers your muscle glycogen needs, and your liver will sort itself out from your regular meals.

Does the “Anabolic Window” Change How Much You Need?

The idea that you must slam a shake within 30-60 minutes of finishing your last set or lose your gains has been heavily scrutinized. A widely cited review on post-exercise nutrient timing concluded that while consuming protein and carbs after training can theoretically enhance muscle repair and glycogen restoration in a supercompensated fashion, the importance and even the existence of this narrow “window” varies based on several factors, including whether you ate before training and how much total nutrition you get across the day.

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If you trained fasted, there’s a stronger case for getting carbs and protein in soon after. If you had a solid meal an hour or two before training, the amino acids and glucose from that meal are still circulating, and rushing to consume dextrose immediately is less critical. For glycogen specifically, muscle cells are more receptive to glucose uptake in the first couple of hours after exercise due to increased activity of glucose transporters in the muscle membrane. So if you want to maximize the rate of glycogen refilling, eating sooner is better. But “maximizing the rate” only matters practically if you’re training again the same day or competing in a tournament-style event. For someone who trains once daily and eats three or four meals, total daily carbohydrate intake matters more than the exact minute you take your dextrose.

Sex Differences in Post-Workout Glucose Handling

Most post-workout carb recommendations are based on research conducted overwhelmingly in men. There are real metabolic differences between men and women that could affect how much dextrose is optimal. Research comparing glucose kinetics between sexes found that women had significantly lower rates of both glucose appearance and glucose disappearance during and after exercise compared to men. In other words, women produce less glucose from their liver during exercise and also clear less glucose from their blood afterward.

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These differences appear to be driven partly by hormonal factors, including differences in glucagon and epinephrine responses to exercise. Women also tend to oxidize proportionally more fat and less carbohydrate during moderate-intensity exercise, which means they may deplete less glycogen for a given workout duration. The practical implication is that women may not need as much dextrose post-workout as the standard recommendations (which were mostly derived from studies in men) suggest. Starting toward the lower end of the range and adjusting based on how you feel, perform, and recover is a reasonable approach.

Dextrose and Creatine Absorption

If you take creatine, pairing it with dextrose or another high-glycemic carb can meaningfully improve how much creatine your muscles actually retain. The mechanism is straightforward: insulin stimulates creatine uptake into muscle cells. An early study on this found that consuming creatine alongside a large dose of simple carbohydrate (about 93 grams of sugar per dose, taken four times daily) augmented creatine retention significantly compared to creatine alone, and serum insulin levels were substantially elevated in the carb group.

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A follow-up study showed that you don’t necessarily need that much sugar. Taking creatine with roughly 50 grams of protein and carbohydrate combined was just as effective at boosting creatine retention as taking creatine with nearly 100 grams of carbs alone, improving retention by about 25% compared to placebo in both cases.

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This means your post-workout shake of protein plus dextrose is already doing double duty if you add creatine to it. You don’t need to take a separate massive sugar dose just for creatine absorption. The insulin from your protein-carb combination handles it.

When Less Dextrose Might Be Better

Not everyone should be chasing maximum glycogen replenishment. If your primary goal is fat loss, aggressively replacing every calorie of glycogen you burned with dextrose may work against you. One study explored this directly: when participants replaced the carbohydrate they had expended during exercise immediately afterward, their insulin sensitivity the next morning was worse compared to those who stayed in a carbohydrate deficit after the same workout. The carb-replacement group showed about a 25% lower insulin sensitivity index and roughly 16% higher insulin resistance the following morning.

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This doesn’t mean post-workout carbs are harmful. It means that if you exercised partly to improve metabolic health or create a caloric deficit, immediately filling that deficit with dextrose may blunt some of the metabolic benefits of the exercise session itself. For people focused on body recomposition who train once a day and aren’t worried about same-day performance, a smaller dose of dextrose (or even skipping it and just eating a balanced meal) can be the smarter play. The full 1.0-1.2 g/kg recommendation comes from research optimizing for athletes who need to perform again soon.

Practical Dosing by Scenario

Because “how much dextrose” is so context-dependent, here’s how the evidence shakes out for common training scenarios:

High-volume resistance training (60+ minutes, many sets): 0.5-0.8 g/kg of dextrose or maltodextrin, paired with 20-40 g protein. A 80 kg lifter might use 40-65 grams. This covers the moderate glycogen depletion from a long lifting session.
Brief, heavy strength work (under 45 minutes, low total volume): 20-40 grams is likely sufficient. Glycogen depletion from short, heavy sessions is lower than most people assume.
Endurance sessions (60-120+ minutes at moderate intensity): 1.0-1.2 g/kg is appropriate, especially if you’re training again within 24 hours. For a 70 kg runner, that’s 70-84 grams. Consider maltodextrin or a glucose-fructose blend for the larger doses to reduce gut discomfort.
Two-a-day training or tournament competition: Aim for the upper range, 1.0-1.2 g/kg per hour, beginning immediately after the first session and continuing until the next bout. This is where rapid glycogen restoration becomes genuinely performance-relevant.
Fat loss or metabolic health focus: You can reduce or skip the dextrose. A protein-rich meal within a couple of hours is enough. The metabolic benefits of maintaining the post-exercise energy deficit can outweigh the glycogen-refilling benefit.

Hydration and Carb Drinks

Mixing dextrose into a post-workout drink does more than deliver calories; the sodium and carbohydrate content of recovery beverages affects how well you rehydrate. Research comparing water, a sports drink, and an oral rehydration solution after exercise-induced dehydration found that both sodium-containing carbohydrate beverages resulted in significantly better fluid retention than plain water over three and a half hours, with the drinks achieving roughly 74-77% fluid retention versus about 58% for water alone.

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This means a dextrose drink with a pinch of salt can pull triple duty: replenishing glycogen, stimulating insulin for muscle recovery, and improving rehydration. If you’re mixing your own, keep the solution in the 6-8% carbohydrate range (roughly 15-20 grams of dextrose per 250 mL of water) for the best balance of absorption speed and gut comfort. Stronger concentrations sit in the stomach longer and can cause the osmolality-driven GI distress mentioned earlier. For larger carb doses, sipping over 15-30 minutes rather than chugging is easier on your system.

An additional detail worth knowing from fluid absorption research: within the osmolality range of typical 6% carbohydrate-electrolyte drinks, total fluid absorption from the small intestine during exercise was not significantly different from plain water.

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That finding applies during exercise rather than after, but it reinforces the point that moderate carbohydrate concentrations don’t impair fluid uptake. You’re not sacrificing hydration by adding sugar to your post-workout water, as long as you keep the concentration reasonable.