Maltodextrin & Dextrose
What is it?
Maltodextrin and Dextrose are high-glycemic index carbohydrates widely used in sports nutrition for rapid muscle glycogen replenishment. Dextrose is pure glucose — the simplest carbohydrate, absorbed directly by the intestine without additional digestion. Maltodextrin is a polysaccharide derived from starch (corn, potato or wheat) with a longer chain than dextrose, but with equally high glycemic index. They are the carbohydrates of choice for peri-workout windows where absorption speed is a priority.
Main Benefits
- Rapid post-workout muscle glycogen replenishment
- Fast energy source during long workouts
- Enhances creatine and amino acid uptake by muscle (via insulin)
- Reduces muscle catabolism in long-duration training
- Very accessible cost per gram of carbohydrate
- Easy addition to peri-workout shakes and drinks
Who it's for
- •Endurance athletes with training sessions over 60–90 minutes
- •Resistance training practitioners in mass gain phase (bulking)
- •People who use creatine and want to maximize its uptake
- •Athletes with multiple training sessions per day
- •People who have difficulty consuming solid carbohydrates in the peri-workout
Common Dose
30–60g per dose in the immediate post-workout, combined with protein (Whey). During long training: 30–60g/hour in sports drink. For creatine uptake: 30–50g together with 3–5g of creatine.
Available Types
Dextrose (Pure Glucose)
Characteristics
- •Pure glucose — immediate absorption
- •GI = 100 (maximum reference)
- •Pronounced sweet taste
- •Lower osmolarity than maltodextrin in concentrated solution
Pros
- Fastest absorption
- Immediate insulin stimulus
- Very low cost
Cons
- Very sweet taste may be unpleasant at high doses
- May cause gastrointestinal discomfort at high doses in solution
Best for
- Immediate post-workout glycogen replenishment
- Creatine uptake
- Short-duration, high-intensity training
Maltodextrin
Characteristics
- •Short-medium chain polysaccharide
- •High GI (85–105 depending on source)
- •Slightly sweet taste — more neutral than dextrose
- •Lower osmolarity — better gastrointestinal tolerance in solution
Pros
- Better gastrointestinal tolerance in large volumes
- More neutral taste
- Good absorption with insulin stimulus similar to dextrose
Cons
- Slightly more expensive than dextrose
- Slightly slower absorption than pure glucose
Best for
- Sports drinks during long training
- Post-workout in large volumes
- Those sensitive to the very sweet taste of dextrose
Quick Comparison
| Feature | Dextrose | Maltodextrin |
|---|---|---|
| Type | Monosaccharide | Polysaccharide |
| Glycemic index | 100 | 85–105 |
| Absorption speed | Maximum | High |
| Taste | Very sweet | Slightly sweet |
| GI tolerance | Good | Very good |
| Cost | Very low | Very low |
How to Choose
Dextrose
Choose if:
- You want maximum post-workout absorption speed
- You use it to enhance creatine uptake
- You prefer minimum cost
Maltodextrin
Choose if:
- You use it in sports drinks during long training
- You have gastrointestinal sensitivity to dextrose in large volumes
- You prefer a more neutral taste
What the Science Says
Evidence for high-GI carbohydrates in the peri-workout is solid for glycogen replenishment and performance in subsequent training. Studies show that the carbohydrate + protein combination post-workout is superior to protein alone for protein synthesis and glycogen replenishment. Insulin released by high-GI carbohydrates enhances muscle uptake of amino acids and creatine. In endurance training, intake of 30–60g/hour of carbohydrate improves performance by 2–3%.
Possible Side Effects
Blood sugar increase — people with diabetes or insulin resistance should be cautious. Gastrointestinal discomfort at very high doses or in highly concentrated solution. Contributes to fat gain if total daily calories exceed expenditure. Not indicated for people on low-carb or ketogenic diets.
Final Summary
Maltodextrin and Dextrose are the most accessible and effective peri-workout carbohydrates available. Use dextrose for maximum post-workout absorption speed and creatine uptake; maltodextrin for long training and large volumes. Both have very low cost and proven efficacy. Not necessary for everyone — those who train fasted or have fat loss goals should evaluate the context.