Homemade Electrolyte Drink: The Dual-Transport Recipe
Field note #157 · 2026-05-30 · 4 min read
Rapid answer
Mix 45g maltodextrin, 22g fructose, 700mg sodium (from table salt or sodium citrate), 150mg potassium, and 500mL water per bottle. This delivers 90g carbohydrate per hour at a race-pace drinking rate, well above the 60g single-sugar ceiling.
The commercial electrolyte drink market runs on the same ingredients your grocery store stocks, marked up 300 to 500 percent. More importantly, most commercial products cap carbohydrate concentration at 6 to 8 percent to avoid GI upset, which limits you to 60 grams of carbs per hour. A dual-transport formulation breaks that ceiling.
The dual-transport principle
A dual-transport electrolyte drink uses two carbohydrate sources, maltodextrin (glucose polymer) and fructose, to saturate two different intestinal absorption pathways simultaneously. A 2:1 ratio of maltodextrin to fructose raises carbohydrate absorption from 60 grams per hour to 90 grams per hour.
Maltodextrin is absorbed via the SGLT1 transporter, which saturates at 60g/h of glucose equivalents. Fructose uses the GLUT5 transporter, which can handle 30 to 36 additional grams per hour. Running both transporters at capacity is the mechanism behind every high-carb race formula on the market.
The recipe (per 500mL bottle)
| Ingredient | Amount | Role |
|---|---|---|
| Maltodextrin (DE 10 to 18) | 45g | Primary carbohydrate, fast-absorbing |
| Fructose | 22g | Dual-transport carb, fills GLUT5 |
| Sodium chloride (table salt) | 0.9g (about 1/5 tsp) | Electrolyte, flavor, gastric emptying |
| Potassium chloride (NoSalt) | 0.3g (small pinch) | Secondary electrolyte |
| Water | 500mL |
Osmolarity: approximately 250 to 280 mOsm/kg (isotonic). This range supports rapid gastric emptying.
Cost per bottle: Roughly $0.30 to $0.40 for the ingredients at bulk pricing, versus $2.50 to $4.00 for a commercial equivalent.
Where to buy the ingredients
- Maltodextrin: Amazon, bulk supplement suppliers (BulkSupplements, True Nutrition), and homebrew shops. DE 10 to 18 is the right range for sports drinks (lower DE = lower sweetness, lower osmolarity).
- Fructose: Grocery store baking aisle or supplement suppliers. Plain fructose, not high-fructose corn syrup.
- NoSalt (potassium chloride): Most grocery stores, near the salt. One container lasts a long time.
- Table salt: Standard iodized salt works. Sodium citrate is a milder-tasting alternative if you find salt flavor too prominent.
Adjusting for your sweat rate and sodium needs
The recipe above targets an average sweater at moderate sodium needs (about 700mg per liter of fluid). Salty sweaters losing 1,200 mg/L or more need more sodium per bottle.
Use the sodium calculator to find your per-hour sodium target, then scale the salt accordingly:
| Sodium target per hour | Approx. salt per 500mL bottle |
|---|---|
| 500 mg/h (low sweat) | 0.6g (1/8 tsp) |
| 700 mg/h (average) | 0.9g (1/5 tsp) |
| 1,000 mg/h (moderate-high) | 1.3g (1/4 tsp) |
| 1,400 mg/h (salty sweater) | 1.7g (1/3 tsp) |
The homemade electrolyte drink calculator generates the full recipe including potassium and magnesium for your specific sweat profile.
Taste and palatability notes
The maltodextrin-fructose blend is mildly sweet, less so than table sugar at the same carbohydrate density. If the sweetness is too low for your preference, add a small amount of citric acid (lemon juice or powdered form) for tartness.
At concentrations above 10 percent carbohydrates, gastric emptying slows. The 500mL recipe above is at roughly 13.4 percent, which is slightly hypertonic. If you experience GI issues, increase to 600mL water per serving to bring the concentration down.
Frequently asked questions
What is a 2:1 maltodextrin to fructose ratio?
A 2:1 maltodextrin to fructose ratio means two grams of maltodextrin for every one gram of fructose in the drink. In the recipe above, that is 45g of maltodextrin and 22g of fructose per 500mL bottle. The ratio is based on the absorption capacities of the two intestinal transporters involved: SGLT1 handles maltodextrin at up to 60g per hour, and GLUT5 handles fructose at up to 30g per hour. Matching the ratio to the transporter capacities ensures neither pathway is underloaded or overloaded.
Why does dual transport matter for long events?
During events over 2 to 3 hours at race intensity, glycogen stores become the limiting factor in performance. A single-sugar drink caps carbohydrate absorption at 60g per hour because the SGLT1 transporter saturates. A dual-transport drink using maltodextrin and fructose saturates both SGLT1 and GLUT5 simultaneously, raising absorption to 90g per hour. Over a 4-hour race, that difference is 120 additional grams of carbohydrate available to working muscles, which meaningfully delays glycogen depletion and extends high-intensity output.
Can I make a dual-transport drink without maltodextrin?
Sucrose (table sugar) is a 1:1 glucose-to-fructose combination, so it partially activates both transporters and is a workable substitute. A sucrose-based drink achieves around 75 to 80g per hour absorption rather than the 90g ceiling of a 2:1 maltodextrin-to-fructose blend, because the glucose-to-fructose ratio is suboptimal and the higher osmolarity of sucrose slows gastric emptying compared to maltodextrin. For training rides and events where 75g/h is sufficient, sucrose in water is a practical and cheap alternative.
What happens if I only use one carbohydrate source in my sports drink?
Using only glucose or only maltodextrin limits absorption to roughly 60g of carbohydrate per hour because only the SGLT1 transporter is available. Any carbohydrate above that rate sits in the small intestine, draws water inward by osmosis, and causes bloating, cramping, and diarrhea. Using fructose alone saturates only GLUT5 at around 30g per hour and also causes GI distress at higher intakes. Neither single-sugar approach can match the 90g per hour ceiling achievable with a properly formulated dual-transport blend.