
GU Energy
Hydration Drink Tabs
3 g of carbs a serving, from cane sugar.
- Carbs
- 3 g
- Price
- $0.67 a serving
- RC Science Score
- 100out of 100
GU Energy Hydration Drink Tabs has 3 g of carbs a serving and Science in Sport GO Electrolyte Drink Mix has 37 g. Here's how they compare on weight, cost, sodium and the label, and what your race looks like on each.

GU Energy
3 g of carbs a serving, from cane sugar.

Science in Sport
37 g of carbs in a 40 g (1.4 oz) serving, from fructose.
numbers from each brand's label, verified by CarbRate
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GU Energy Hydration Drink Tabs
Science in Sport GO Electrolyte Drink Mix
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| Hydration Drink Tabs | GO Electrolyte Drink Mix | |
|---|---|---|
| Carbohydrate | 3 g | 37 g |
| Serving weight | not listed | 40 g (1.4 oz) |
| Calories | 10 | 146 |
| Sodium | 320 mg | 194 mg |
| Potassium | 55 mg | 0 mg |
| Caffeine | 0 mg | 0 mg |
| Protein | 0 g | 0 g |
| Carbs from | cane sugar | fructose |
| Cost per serving | $0.67 | $1.25 |
| RC Science Score | 100 | 36 |
They match on all 4.
GU Energy Hydration Drink Tabs
Science in Sport GO Electrolyte Drink Mix
Set your carbs an hour and race length. Both options hit the same target.
| Hydration Drink Tabs | GO Electrolyte Drink Mix | Half each | |
|---|---|---|---|
| Electrolytes an hour | 20 | 1.6 | 10 + 0.8 |
| Electrolytes for the race | 80 | 7 | 40 + 4 |
| Sodium an hour | 6400 mg | 315 mg | 3357 mg |
| Cost for the race | $53.60 | $8.11 | $30.85 |
| 20 Hydration Drink Tabs an hour is more than most stomachs take. Move part of your carbs into a drink mix. Half each takes half your carbs from each. | |||
Your own carbs an hour depend on your body and goal time.
Build my free planThree electrolytes that each lead on one thing.

More carbs for the money
Precision Fuel & Hydration PH 1000 Electrolyte Drink Mix16.5 g of carbs · $1.75
Most carbs per serving
Precision Fuel & Hydration PH 1500 Electrolyte Drink Mix15.4 g of carbs · $1.75CarbRate builds your fueling plan from the amount of glycogen you burn, your goal time, your course and the electrolytes you use.