SiS HYDRO Tablets - Tube of 20
Nutrition
SiS HYDRO Tablets - Tube of 20
SiS HYDRO Tablets - Tube of 20
The SiS HYDRO Tablets are effervescent electrolyte tablets designed to turn plain water into a scientifically effective hydration drink. Read the overview
At a glance
- Format
- Tube of 20 effervescent tablets
- Electrolytes per serving
- 789mg
- Sodium concentration
- 30mmol/L
- Calories per tablet
- Approximately 10
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Overview
Are SiS HYDRO Tablets worth using for everyday cycling hydration?
The SiS HYDRO Tablets are effervescent electrolyte tablets designed to turn plain water into a scientifically effective hydration drink. Drop one tablet into 500ml of water, let it dissolve, and you have a low-calorie electrolyte drink with 789mg of essential electrolytes and added B vitamins (B1, B2, and B6) per serving. The formula delivers sodium at a concentration of 30mmol/L, the level Science in Sport has shown to produce superior hydration compared to water alone. Originally developed to keep the British Sailing team optimally hydrated at the 2008 Beijing Olympics, HYDRO has since become a staple for athletes who need reliable electrolyte support without the carbohydrates of a full sports drink.
Available in four flavors: Lemon, Berry, Pineapple and Mango, and Strawberry and Lime. Each tube contains 20 tablets. HYDRO is the right product for pre-exercise hydration, sub-90-minute sessions where energy intake is not needed, hot weather training, or everyday hydration when you are sweating and want more than water. Ten calories per tablet and less than 1g of sugar makes it compatible with any diet. Informed Sport certified, every batch tested against the WADA banned substances list.
All the specs
- Format
- Tube of 20 effervescent tablets
- Electrolytes per serving
- 789mg (sodium, potassium, calcium, magnesium)
- Sodium concentration
- 30mmol/L
- Calories per tablet
- Approximately 10
- Sugar per tablet
- Less than 1g
- Vitamins
- B1 (Thiamin), B2 (Riboflavin), B6 (Pyridoxine)
- Flavors carried by DCL
- Lemon, Berry, Pineapple and Mango, Strawberry and Lime
- Certifications
- Informed Sport certified, Vegan, Gluten-free
- Usage
- Drop 1 tablet in 500ml water. Let dissolve fully. Consume within 24 hours. Max 4 tablets per day.
FAQ
Good questions
Get to know Science in Sport

There's more to Science in Sport than this one product. Our Science in Sport page has the full Science in Sport lineup we carry and more about the brand.
Visit the Science in Sport page →How do you use SiS HYDRO Tablets?
Drop one tablet into 500ml (approximately 17 oz) of water and allow it to fully dissolve. Consume within 24 hours once mixed. Do not exceed 4 tablets per day.
When should I use HYDRO Tablets versus a full sports drink?
Use HYDRO before exercise and during sessions lasting under 90 minutes when you need electrolytes but not carbohydrates. For sessions over 90 minutes where energy is also needed, switch to a carbohydrate-containing drink or add gels alongside HYDRO.
What electrolytes are in SiS HYDRO Tablets?
Each tablet provides 789mg of essential electrolytes including sodium, potassium, calcium, and magnesium, plus B vitamins B1, B2, and B6. Approximately 10 calories per tablet with less than 1g of sugar.
Why is the sodium concentration specifically 30mmol/L?
The 30mmol/L sodium concentration is the level that Science in Sport has shown to produce superior hydration compared to water alone. It stimulates thirst, promotes fluid retention, and supports optimal fluid balance during exercise.
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