
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 Nuun Sport Tablets has 4 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.

Nuun
4 g of carbs in a 5 g (0.2 oz) serving.
numbers from each brand's label, verified by CarbRate
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GU Energy Hydration Drink Tabs
Nuun Sport Tablets
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| Hydration Drink Tabs | Sport Tablets | |
|---|---|---|
| Carbohydrate | 3 g | 4 g |
| Serving weight | not listed | 5 g (0.2 oz) |
| Calories | 10 | 15 |
| Sodium | 320 mg | 300 mg |
| Potassium | 55 mg | 150 mg |
| Caffeine | 0 mg | 0 mg |
| Protein | 0 g | not listed |
| Carbs from | cane sugar | not listed |
| Cost per serving | $0.67 | $0.75 |
| RC Science Score | 100 | 100 |
3 of 4 differ: vegan and gluten free and glucose + fructose.
GU Energy Hydration Drink Tabs
Nuun Sport Tablets
Set your carbs an hour and race length. Both options hit the same target.
| Hydration Drink Tabs | Sport Tablets | Half each | |
|---|---|---|---|
| Electrolytes an hour | 20 | 15 | 10 + 7.5 |
| Electrolytes for the race | 80 | 60 | 40 + 30 |
| Sodium an hour | 6400 mg | 4500 mg | 5450 mg |
| Cost for the race | $53.60 | $45.00 | $49.30 |
| 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 planCarbRate builds your fueling plan from the amount of glycogen you burn, your goal time, your course and the electrolytes you use.