What it is & primary uses
A single glucose unit that is absorbed rapidly and can supply carbohydrate during long exercise or time-sensitive recovery.
Main benefits
- Rapid, simple carbohydrate source
- Can support endurance performance when carbohydrate availability is limiting
Studied protocols
Research doses are grouped by outcome. They describe study designs—not a personal prescription.
30–60 g carbohydrate/hour
- Study duration
- During events lasting roughly 1–2.5 hours
- Interpretation
- Glucose can supply this range when exercise duration and intensity justify carbohydrate feeding.
Up to 90 g/hour as part of a glucose–fructose blend
- Study duration
- During events beyond about 2.5 hours
- Interpretation
- Glucose alone is not the preferred way to reach the upper range because intestinal transport becomes limiting.
04Food sources & equivalents＋
Can food provide a studied amount?
Juice, sugar and sports foods can supply glucose, but pure dextrose is an isolated ingredient.
Carbohydrate in a different food matrix and at a variable rate
- How this was estimated
- No gram-for-gram food conversion is shown because processing, carbohydrate mixture, fiber, fluid and osmolality change the exercise context.
- Important limitation
- These foods may also contain fructose, sucrose, acids or carbonation and are not identical to dextrose powder.
Food equivalents compare ingredient mass using published composition values. They do not prove equal absorption, formulation, physiological effect, safety or personal need.
Source: Carbohydrates for training and competition ↗05How to take it for absorption & tolerance＋
With water
Dextrose is rapidly absorbed glucose, but a concentrated glucose-only drink can exceed gastrointestinal tolerance during exercise.
- Practical approach
- Divide the hourly target, use adequate fluid and practice the exact race plan in training.
- Watch for
- Do not jump directly to a high hourly intake or use glucose alone to chase a 90 g/hour target.
Meal guidance reflects human pharmacokinetic, clinical, official-label or evidence-review sources where available. A food pairing can change absorption or tolerability, but does not make a supplement necessary, effective or safe for every person.
Source: Carbohydrates for training and competition ↗06Supplement interaction check＋
An unlisted pair means no established pair-specific interaction was identified in this review—not proof that every dose, product or person is safe.
This is not proof that every dose, product or user context is safe. Medication and condition checks still apply.
07Research notes＋
Strong evidence supports carbohydrate during prolonged endurance exercise; evidence does not show that dextrose alone is universally superior to other well-tolerated carbohydrate sources.
Dextrose is glucose. It is not automatically better than other carbohydrate formats; duration, total grams per hour, fluid concentration and gut tolerance determine the practical fit.
08Scientific references＋
Peer-reviewed human research and formal evidence reviews. Open each source to inspect the complete paper record.
Carbohydrates for training and competition
Dose context: 30–60 g/hour; up to 90 g/hour with multiple transportable carbohydrate
Carbohydrate targets should rise with event duration and use glucose plus fructose when delivery approaches 90 g/hour.
Carbohydrate supplementation and endurance performance
Dose context: Multiple carbohydrate formats and endurance protocols
Carbohydrate ingestion improved endurance outcomes on average, with larger effects as exercise duration increased.
09Expert & media references＋
Podcast and practitioner statements are clearly separated from research. They may explain practice or emerging ideas, but do not prove efficacy.
Dose Radar will leave this lane empty rather than invent or infer a professional opinion.