Sugar-Free Electrolyte Powder: Do Electrolyte Drinks Need Sugar?

"Low sugar electrolyte powder" was the fastest-rising electrolyte search in India over the past year, and "sugar free electrolyte powder" is close behind. The instinct is sound: a lot of hydration drinks are soft drinks in disguise. But zero sugar isn't automatically better. Whether you want some glucose depends on what you're using the drink for.

Why there's glucose in ORS in the first place

Your small intestine absorbs sodium through several routes. One of the fastest is a transporter called SGLT1, which carries two sodium ions in with each molecule of glucose. As sodium and glucose move into the blood, water follows by osmosis.

This is the principle behind oral rehydration salts. The WHO formula contains glucose and sodium in equal molar amounts, 75 mmol/L each.¹ A review of every human intestinal perfusion study since the 1960s found that carbohydrate in a drink helps pull in sodium and water, but too much carbohydrate slows water absorption.² The useful range is small amounts, not more.

How much sugar is in your hydration drink?

• WHO ORS: 6.75 g glucose per 500 ml¹
• Flow: 6.9 g glucose per sachet, about 28 kcal
• Coconut water: about 13–20 g per 500 ml, depending on the nut⁵
• A typical 6% sports drink: 30 g per 500 ml. Sports drinks are designed to fuel long efforts, and ACSM recommends drinks with 5–10% carbohydrate during prolonged exercise.³

For scale, a level teaspoon of sugar is about 4 g. ICMR advises keeping added sugar under 5% of daily energy,⁶ so a 30 g sports drink would use up most of that budget for many adults.

When sugar-free makes sense

• Everyday or desk use, where you're not burning much energy.
• Low-carb or keto diets. Cutting carbohydrate increases sodium loss through the kidneys, so many people do feel better with salt and electrolytes and no sugar.
• Diabetes. Talk to your doctor about any electrolyte drink; for most, a few grams of glucose during exercise is manageable, but it's individual.

When a little glucose is worth it

• Rehydrating fast after heavy sweating, when absorption speed matters. Glucose-sodium co-transport is exactly what ORS relies on.^1,2
• Sessions over 60–90 minutes, where carbohydrate also helps performance. For long events, ACSM and sports dietitians recommend 30–60 g of carbohydrate an hour from drinks, gels or food.⁴

Even then you don't need a sugary drink. A low-sugar electrolyte mix plus a banana or a gel lets you control sodium and fuel separately.

What about "zero sugar" sweeteners?

Zero-sugar mixes get their sweetness from sucralose, stevia, aspartame, acesulfame-K or sugar alcohols such as erythritol and maltitol. They're approved food additives in India. Some people find sugar alcohols upset their stomach during exercise, so test any new drink in training, not on race day.

We chose a small dose of glucose over sweeteners, so Flow isn't zero sugar, and we don't claim it is. If you want truly sugar-free hydration for a desk day, water and a salted meal will do.

How to read the label

1. Find sugars per serving and the water volume it's for.
2. Check whether it's glucose/dextrose (useful for absorption) or sucrose and fruit juice (mostly just calories).
3. Look at sodium. A low-sugar drink with almost no sodium is just flavoured water. See our electrolyte powder guide.