Sucralose, Stevia and Sugar in Electrolyte Powders

You may have assumed the sugar in an electrolyte drink is just there to make it palatable. Sometimes it is. Sometimes it’s the part doing the work.

That’s what makes the sweetener question in this category different from the one in protein powder. Here, cutting the sugar can make the drink less effective at the one job it exists for.

Short answer: In an oral rehydration formula, glucose helps the gut absorb sodium and water, which is why the WHO recipe includes it. For everyday sipping that benefit doesn’t matter, and a 16 g stick with 11 g of sugar is mostly added sugar. The zero-sugar options each come with a caveat: the WHO advises against non-sugar sweeteners for weight control, sucralose has new lab findings on a breakdown product, monk fruit has thin safety data in Europe, and erythritol has been linked to blood-clotting effects.

Why rehydration formulas use glucose

First, the reason the sugar is there at all.

Glucose helps the small intestine absorb sodium, and water follows the sodium. The WHO describes it as glucose facilitating sodium absorption on a one-to-one molar basis, which is why its formula balances 75 millimoles of each per liter. The transporter responsible, SGLT1, keeps working even during cholera, as a 2014 review explains, which is the whole reason oral rehydration saves lives.

So for someone sick with diarrhea or vomiting, a mix with real sugar is the right product. That’s not a loophole. It’s the design.

For someone stirring a stick into their water at a desk, the same 7 to 12 g of sugar is just added sugar. The American Heart Association suggests no more than about 6 teaspoons of added sugar a day for most women and 9 for most men, and the current Dietary Guidelines suggest keeping any one meal to 10 g. A Liquid I.V. stick carries 11 g.

Sucralose: a new question about an old sweetener

You may have heard about this one by now. In 2023, researchers reported that sucralose-6-acetate, an impurity in commercial sucralose that can also form in the gut, was genotoxic in two laboratory assays, meaning it damaged genetic material in cells. They estimated a single sucralose-sweetened drink might exceed the threshold of concern for that kind of substance, and found it impaired gut-lining integrity in lab tissue.

All of that was in vitro. It’s a signal worth taking seriously, not a finding in people.

The human evidence points in a related direction. In a 2022 randomized trial in Cell, 120 adults took non-nutritive sweeteners for two weeks at doses below the acceptable daily intake. All four sweeteners changed the gut microbiome, and sucralose and saccharin impaired glucose responses, with effects that varied from person to person. Two of the authors co-founded a personalized-nutrition company, which the paper discloses.

The FDA still sets sucralose’s acceptable daily intake at 5 mg per kilogram of body weight, unchanged since approval in 1998.

The WHO’s 2023 advice

In May 2023, the WHO advised against using non-sugar sweeteners for weight control or to reduce the risk of diet-related disease. Its review found no long-term benefit for body fat and possible associations with higher type 2 diabetes, cardiovascular disease and mortality.

Two details matter. It’s a conditional recommendation, the WHO’s weaker category. And it covers sucralose, stevia and its derivatives, acesulfame K, aspartame and several others, while excluding sugar alcohols like erythritol and not applying to people with existing diabetes. The current US Dietary Guidelines also advise limiting non-nutritive sweeteners.

Stevia and monk fruit: GRAS, with an asterisk

Stevia is the most common zero-sugar choice in the cleaner mixes. The FDA hasn’t questioned GRAS notices for high-purity steviol glycosides, with an acceptable intake of 4 mg per kilogram of body weight. Whole stevia leaf and crude extracts are a different matter: the FDA doesn’t consider them GRAS.

Monk fruit has the same FDA status for its extracts and is 100 to 250 times sweeter than sugar. Europe is more cautious. EFSA’s food additives panel concluded in 2019 that the data were insufficient to conclude on its safety as an additive, pointing to effects on the testes in a 90-day rat study. That’s a gap in the evidence rather than a finding of harm, and it’s still worth knowing.

Erythritol: the one with a clotting signal

Here’s the most surprising finding on the list. Erythritol is a sugar alcohol that got popular as the “natural” zero-calorie option, and in 2023 a study in Nature Medicine found that people with higher blood erythritol levels had more heart attacks and strokes across two cohorts, and that erythritol increased platelet reactivity in the lab. That was observational, so it can’t prove cause.

A 2024 follow-up was smaller but more direct. Ten volunteers drank 30 g of erythritol and ten drank 30 g of glucose. Platelet reactivity rose in every person who drank the erythritol, and not with the glucose. The senior researcher discloses industry ties.

Sweetener	Where it shows up	What to know
Sugar or dextrose	Liquid I.V., DripDrop, Pedialyte	Helps sodium absorb during illness; otherwise added sugar
Sucralose	Many mainstream mixes	In-vitro genotoxicity finding for a breakdown product; microbiome effects in a 2022 trial
Stevia	LMNT, Nuun, Ultima, flavored Re-Lyte	High-purity extract is GRAS; covered by the WHO’s 2023 advice
Monk fruit	Some “clean” mixes	GRAS in the US; EFSA found the data insufficient in 2019
Erythritol	Some zero-sugar powders	Linked to higher platelet reactivity in a 2024 trial
None	Unflavored LMNT and Re-Lyte	Tastes like salt water, which is the honest trade

Our take

Match the sweetener to the job.

If you’re sick, use something with real glucose, ideally close to the WHO formula. That’s the situation sugar was put in these products for. If you’re training long and hard, a little sugar helps too, both for absorption and for fuel.

If you’re using electrolytes casually, skip the sugar and keep the sweetener simple. An unflavored mix with no sweetener at all is the cleanest option and the one we’d reach for first, followed by stevia, which has the longest safety record among the zero-calorie choices. We’d avoid erythritol-heavy powders until the clotting question is settled.

Our vetted electrolyte powders name the sweetener for every pick. And before any of it, it’s worth reading whether you need electrolytes at all.

Frequently asked questions

Why do electrolyte drinks have sugar?

Glucose helps the small intestine absorb sodium, and water follows sodium, which is why the WHO’s oral rehydration formula includes it in roughly equal measure. That matters during illness and long exercise. For casual daily use, the sugar is mostly just added sugar.

Is sucralose safe in electrolyte powders?

The FDA considers it safe within its acceptable daily intake. A 2023 lab study found a sucralose impurity and breakdown product was genotoxic in cell assays, and a 2022 human trial found sucralose changed gut bacteria and glucose responses. Neither proves harm at typical intakes, but both are reasons some people choose to avoid it.

Is stevia better than sucralose?

High-purity stevia extract has GRAS status in the US and a longer, cleaner research record than the newer sucralose findings. Both are covered by the WHO’s 2023 advice against relying on non-sugar sweeteners for weight control. If you want to avoid sweeteners entirely, unflavored mixes exist.

Is erythritol safe?

It’s approved for use, but a 2023 observational study linked higher blood erythritol to heart attack and stroke, and a small 2024 trial found that 30 g of erythritol increased platelet reactivity in every participant. Until that question is resolved, we’d choose a powder sweetened another way.

What is the healthiest electrolyte drink sweetener?

None at all, if you can live with the taste of lightly salted water. Among sweeteners, high-purity stevia has the most established safety record. If you’re sick and dehydrated, real sugar is the right choice because it helps sodium absorb.