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Review summary: SiS Hydro Go is a coin-size effervescent tablet that turns into a fizzy, delightful sports drink when mixed with 500 ml of water. At 4.5 g per serving, the tablet provides zero protein and fat and only 0.9 g of carbohydrates (none from sugar). Designed for hydration, it contains 345 mg of sodium, 65 mg of potassium, 269 mg of chloride, 102 mg of calcium, and 8.1 mg of magnesium. The tablet is also fortified with vitamins B1, B2, and B6.

Out of all the different types of hydration/electrolyte sports nutrition, effervescent tablets are my favorite because they’re easy to mix, and I enjoy the bubbles (flavorless sodium pills are my second favorite).

I recently tested Science in Sport’s (SiS) Hydro Go Tablets, which have a delightful flavor and contain no sugar.

If you’re interested in learning how to pick the right sports drinks for you, here’s a comprehensive guide. Without further ado, read on for Runivore’s SiS Hydro Go Tablet review.

What is SiS Hydro Go Tablet?

It’s a coin-size effervescent tablet that turns into a fizzy sports drink when mixed with 500 ml of water.

The company claims that the product “meets your sodium requirements at a specific concentration (30mmol/L) that is scientifically proven to produce superior hydration compared with water alone.

The tablets are also low in carbohydrates and calories, meaning they’re designed for hydration and not a good source for replenishing glycogen.

What are the ingredients and nutrition facts of SiS Hydro Go Tablet?

We tried the Pink Grapefruit and Lemon flavors.

At 4.5 g per tablet, SiS Hydro Go provides minimal macronutrients -zero protein and fat and only 0.9 g of carbohydrates (none from sugar). Designed for hydration, it’s packed with electrolytes: 345 mg of sodium, 65 mg of potassium, 269 mg of chloride, 102 mg of calcium, and 8.1 mg of magnesium. The tablet is also fortified with vitamins B1, B2, and B6.

The amount of electrolytes and vitamins may differ slightly depending on the flavor.

For ingredients, please see the graphics below taken from the product website. Two points worth mentioning:

1. Sodium bicarbonate, aka baking soda, is a hot topic in the sports nutrition discord. Its primary benefit is supposedly neutralizing muscle acidity during exercise so you can go harder and longer. (Maurten recently launched a super expensive sodium bicarbonate product, which we have not had the pleasure to review).

2. The flavors I tested contained green tea extract, but nowhere on the packaging mentioned their caffeine content. Perhaps the caffeine was processed out.


Pink Grapefruit



What are the flavor and consistency of SiS Hydro Go Tablet?

The tablets come in six flavors: Pineapple Mango, Lemon, Cola, Pink Grapefruit, Strawberry and Lime, and Berry. Cola is the sole caffeinated flavor, with 75 mg per tablet.

Sports drink mixes and tablets can taste “chemically” and oftentimes, nothing like the advertised flavor. While I know that all effervescent products are highly processed, Pink Grapefruit transformed into a refreshing beverage that nailed that delightful bittersweet/tart taste of grapefruit juice.

The lemon flavor was just okay by comparison. I would have preferred if the company could increase the lemony sourness.

Blend with 500 ml of water as instructed; the resulting sports drink will have a nice consistency and pleasant flavor you’ll want to consume daily.

The speed that the tablets dissolved was the fastest compared to other similar products I’ve tested.

How’s the packaging of SiS Hydro Go Tablet?

Twenty tablets come in a 14.5 cm tube. It’s probably too difficult to pop open the tube and drop a tablet in your water bottle while running and cycling, so it’s best to pre-mix the sports drink before you begin the run or ride.

However, if you plan to take refueling breaks or rest up in aid stations of ultramarathons, the tube is compact enough to fit in belts and packs.

Does SiS Hydro Go Tablet work?

I’ve used the tablets every day for two weeks and in different situations: as a morning drink, mid-ultramarathon sports drink, post-run rehydration, and daily mineral and vitamin supplement.

While the benefits of daily supplementation aren’t immediately noticeable, SiS Hydro Go was definitely effective for mid-run hydration.

Here are a few takeaways:

  1. When you’re running and a bit dehydrated and have already eaten a few gels, a fizzy drink that’s not overly sweet is simply delightful. Pink Grapefruit was especially tasty.
  2. The speed that it took the tablets to dissolve was fast. (I’ve tested several other tablets; one took nearly 5 minutes to dissolve completely.)
  3. The main test drive was a 13-hour, 90 km overnight trail run at easy effort. SiS Hydro Go Tablets were my only hydration sports nutrition. However, I had other solid foods such as a sandwich, potato chips, dried mangoes, energy bars, and energy gels that also provided electrolytes. It wasn’t the most scientifically controlled setting, but I was never dehydrated. My urine remained a light, yellowish color throughout the run.
  4. At the beginning of the trail run, I was slightly overaggressive with refueling carbohydrates with energy gels. I developed a pretty bad case of sweetness fatigue in the second half of the run. It was nice to have a sugar-free drink but still packed with many essential nutrients.
  5. I find this product particularly useful for my summer morning runs. These sessions are typically under 90 minutes, and I do them empty stomach and without a water bottle. However, with the high temperatures, a sugar-free drink that tastes good and packs electrolytes to help me stay hydrated makes for an excellent early-morning refreshment.