Skip to content

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.

Reviews

What riders say about the Lab

4.9 ★★★★★ 119 Google reviews of Dialed Cycling Lab Read all reviews on Google ↗
“Paul does a great job. He got my bike I bought from someone there in their town and had it packed and shipped to me in Austin, TX… It got here in perfect condition!”
Scott Phillips · Google review
“Fantastic store. It has everything you may want/need for cycling. Great team. Highly recommend to anyone looking for cycling related things and bike service.”
Google review
“I recently got back into biking and wanted to add some things onto my bike. They had most of what I was looking for in shop… I'm really happy to have found them.”
Google review

Questions about this one?

Not sure on size, compatibility, or whether this is the right one for you? Ask us. A real person here will answer.

You are asking about SiS HYDRO Tablets - Tube of 20

Goes straight to the Lab with the product you were looking at attached. No newsletter signup.