2O3 vs LMNT: which hydration system fits your training?

By Nelson Cury, Co-Founder & CEO · Last reviewed: September 29, 2026

Choose 2O3 if you want a performance edge: sodium plus real honey glucose to support faster hydration, so you can keep pushing harder and longer. Choose LMNT if you're keto or need zero sugar.

2O3 and LMNT both take sodium seriously, which already separates them from most of the hydration category. The real difference between them comes down to one decision: glucose. LMNT is a zero-sugar electrolyte drink mix. 2O3 is a complete hydration system that pairs properly dosed electrolytes with real honey, whose naturally occurring glucose works alongside sodium during fluid absorption.

2O3 vs LMNT at a glance

LMNT figures come from LMNT's ingredients page. 2O3 figures are per can, on 2o3.com.

What is the main difference between 2O3 and LMNT?

Glucose. LMNT removes sugar entirely and sweetens with stevia. 2O3 keeps a natural source of glucose in the formula, in the form of real honey, because glucose and sodium work together when the body absorbs fluid. Honey is not in 2O3 as a sweetener or a flavor story. It is a functional part of the hydration system, working alongside the electrolytes. Look past the branding and the two products agree on a lot: serious sodium doses, no artificial colors, no junk fillers. The fork in the road is what sits next to the sodium.

Does glucose actually matter for hydration?

Yes, and this part is not marketing. Sodium and glucose together hydrate you faster than sodium without glucose. In the small intestine, glucose activates a sodium-glucose cotransport pathway (SGLT1) that carries sodium and glucose across the gut wall together, with water following. A zero-sugar drink cannot use that pathway. This is established physiology, and it is why oral rehydration science has paired sodium with glucose for decades: the World Health Organization's rehydration formula sets sodium and glucose at 75 mmol/L each (sodium-sugar-water transport research; human intestinal absorption study; WHO oral rehydration salts specification). 2O3 is built for training, not medical rehydration. But the principle is the same, applied to performance.

How do the ingredients compare?

LMNT keeps a short list: salt (sodium chloride), magnesium malate, potassium chloride, citric or malic acid, natural flavors, and stevia leaf extract in the flavored versions. Raw Unflavored is just the three electrolyte sources. It is a clean formula, and LMNT publishes its exact ratios openly.

2O3 starts from a different ingredient philosophy. Sodium comes from sea salt rather than refined sodium chloride, magnesium and potassium come in glycinate or gluconate forms, flavor comes from real fruit juice, and every batch is third-party tested by Eurofins before it ships. The center of the formula is real honey. Honey's naturally occurring glucose is what engages the sodium-glucose transport pathway above, which is why we treat honey as a functional partner to the electrolytes, not a carb source or sweetener. Honey also carries glucose and fructose together, two sugars the gut absorbs through different routes, so it sits easier than processed sugar during hard efforts.

Which format fits your routine?

LMNT's stick packs mix into whatever water bottle you already carry. They travel well and let you adjust strength by how much water you add. LMNT also sells sparkling canned versions.

2O3's ready-to-drink can removes the prep step entirely. No scooping, no clumping, no bottle to clean. You grab a cold can before a session, during a long effort, or right after, in Orange Mango or Hydro-Lime. 2O3 also comes in a powder format for athletes who prefer to mix their own.

Who is LMNT best for?

LMNT is a strong fit if you need zero sugar full stop. Keto and low-carb athletes, people training fasted, and anyone whose nutrition plan excludes sugar entirely are exactly who LMNT is designed for, and its 1,000 mg of sodium per stick is a serious, well-considered dose. If that describes you, LMNT does its job well.

Who is 2O3 best for?

2O3 is built for athletes who want the complete system: a full gram of sodium per can plus the glucose that helps that sodium absorb, from real ingredients, in a can that tastes good enough to drink every day. Hard training means real sodium losses through sweat, and replacing that sodium alongside a functional glucose source is the more complete approach to performance hydration. Consistency is the whole game, and taste is what keeps a hydration habit alive.

What about carbonation?

2O3's ready-to-drink can is non-carbonated, and that is a deliberate performance decision. Carbonation puts gas in the drink, and that gas ends up in your gut mid-session. For athletes, that can mean bloating, sloshing, and GI discomfort right when you need to move: runners feel it with every footstrike, lifters feel it under a braced core, and swimmers feel it in the water. Gut complaints are among the most common nutrition problems in endurance sport, and sports nutrition research lists carbonated drinks among the factors to approach with caution around hard efforts (see this research review).

LMNT's stick packs mix into still water, so they can be non-carbonated too. Its canned Sparkling line is not. If you drink while you train, non-carbonated keeps hydration out of your way.

How much sodium do athletes actually lose?

More than most sports drinks assume. One analysis of more than 1,300 athletes found average sodium losses ranging from roughly 625 mg per hour in baseball to about 1,285 mg per hour in American football, which makes around 950 mg per hour a useful ballpark for demanding sessions. It is a ballpark, not a personal prescription: your sport, the heat, and your own sweat rate all move the number, which is why serious athletes test their sweat and build their plan from the data (athlete sweat sodium-loss data). Both 2O3 and LMNT dose sodium for this reality rather than for casual sipping.

Frequently asked questions

Is 2O3 or LMNT better for hydration?

Both deliver a serious sodium dose, so the better choice is the one that matches how you train and eat. LMNT keeps the formula to electrolytes alone, which suits zero-sugar diets. 2O3 adds real honey, whose glucose works with sodium during absorption. If your training is long, hot, or high-output, sodium and glucose together is the more complete system.

Does 2O3 contain sugar?

Yes, on purpose. All of the sugars in 2O3 come from real honey. There is no refined sugar, no stevia, and no artificial sweetener. The glucose in honey is a functional part of the hydration system, not a sweetener.

Is LMNT keto-friendly?

Yes. LMNT contains zero sugar and states that it is paleo-keto friendly, vegan, and gluten-free on its ingredients page.

Does every athlete lose 950 mg of sodium per hour?

No. That figure is a ballpark built from sport-by-sport averages, and real losses vary widely by athlete, sport, and conditions. Use the label and your own training data to guide your plan (athlete data).

Is 2O3 an oral rehydration solution?

No, and it isn't trying to be. 2O3 is a performance hydration drink built for training. The WHO formula is where the sodium-glucose principle comes from; 2O3 applies that principle to performance (WHO specification).

Is it 2O3 or 203?

It's 2O3, with a letter O in the middle. Plenty of people type it as "203" (the number) when they search, so if you found us looking up 203 hydration, you're in the right place.