Skip to main content
LyteLab
Label Comparison

Nuun Sport vs Liquid I.V.: tablet vs ORS powder

Both are mainstream electrolyte products, but the formulas live in different categories — Nuun is a low-sugar effervescent tablet for daily fitness; Liquid I.V. is an 11g-sugar ORS powder built around the WHO sodium-glucose cotransport mechanism.

·By Croix

Lyte Lab compares published labels, ingredient disclosures, package economics, and formula categories. It does not recommend a product for your health, diet, medications, symptoms, training, or hydration needs.

Formula summary

Nuun is the lower-sugar effervescent tablet profile; Liquid I.V. is the higher-sugar ORS-inspired packet profile.

Side-by-side: per-serving label

MetricNuun Sport Electrolyte TabletsLiquid IV Hydration Multiplier
Sodium300mg500mg
Potassium150mg380mg
Magnesium25mg (magnesium oxide)—
Calcium13mg—
Zinc——
Sugar / carbs4g11g
Calories15 kcal45 kcal
Formattabletpowder
Per-serving price$0.75$1.56
Package price$7.49$24.99

The honest read

These two products are structurally closer to LMNT vs Liquid I.V. than to each other. Nuun Sport lists 300mg sodium and 4g carbs per tablet; Liquid I.V. lists 500mg sodium and 11g sugar per stick. The sodium dose is in the same neighborhood, but Liquid I.V. has nearly 3x the sugar and a different formula rationale.

On format, Nuun's tablet is the actual product and the part of the value worth paying for. Drop one in 16oz of water, wait 90 seconds, drink. That format is genuinely hard to replicate at home and is more practical than measuring powder for on-the-go use. Liquid I.V.'s pre-portioned single-serve sticks are also convenient — open, dump, mix, drink — but the tablet has a small format edge. The friction difference is small, but real if you're choosing one for a gym bag or backpack you'll actually carry around.

On price and per-serving cost, both are in the same neighborhood (~$0.80 for Nuun, ~$1.56 for Liquid I.V.), but the label value is different: Nuun sells the tablet format, while Liquid I.V. sells a higher-sugar packet with more sodium and potassium.

For reverse engineering, the split is format versus ORS-style macros. Nuun's tablet format is hard to reproduce at home, though its mineral totals can be modeled as a powder. Liquid I.V.'s packet is easier to model from bulk salt, KCl, sugar, acid, and flavoring.

Formula profiles

Nuun Sport label profile

Nuun Sport Electrolyte Tablets

  • ·300mg sodium per tablet.
  • ·4g carbs, lower than Liquid I.V.'s 11g sugar.
  • ·Effervescent tablet format is the main differentiator.
  • ·Includes 25mg magnesium oxide.

Liquid I.V. label profile

Liquid IV Hydration Multiplier

  • ·500mg sodium per stick.
  • ·11g sugar, the higher-sugar profile in this pairing.
  • ·380mg potassium, far more than Nuun's 150mg.
  • ·Pre-portioned powder stick with ORS-inspired brand framing.

Or skip both — label-matched DIY versions are ~5-10¢/serving

Both formulas are reproducible from bulk minerals at a fraction of retail. Lyte Lab has tool-generated DIY recipes for each, with shopping lists and per-ingredient SKU links.

DIY Nuun Sport Electrolyte Tablets
Save $0.68/serving · ~91% off retail
DIY Liquid IV Hydration Multiplier
Save $1.48/serving · ~95% off retail
Or build a custom mix in the builder

Frequently asked

Is Nuun's 4g of carbs enough for the SGLT1 cotransport mechanism?+
It's small — and not really the design intent. SGLT1 cotransport works most efficiently when glucose and sodium are in roughly a 1:1 molar ratio, which for 300mg sodium would be roughly 2.5g glucose. Nuun's 4g of total carbs (mostly from the effervescent system and stevia blend) is in the right ballpark but isn't the formula's selling point — the brand's marketing leans on the daily-fitness positioning, not on ORS-grade rehydration. Liquid I.V.'s 11g of sugar at 500mg sodium is much closer to a clinical ORS ratio.
Why does Liquid I.V. have so much more sugar?+
Because that's what makes the cotransport mechanism work efficiently. Liquid I.V.'s entire pitch is built around the WHO ORS science, and the 11g of sugar is structural to that science. Nuun's pitch is built around daily fitness hydration where the priority is low-calorie convenience, not maximum absorption rate. Both are reasonable design choices; they're solving different problems. If you want the cotransport effect at a lower sugar dose, the closest commercial option is Pedialyte AdvancedCare Plus (6g sugar at similar sodium); the DIY version lets you tune the sugar to any target.
Which label is lower carb?+
Nuun Sport lists 4g carbs per tablet. Liquid I.V. lists 11g sugar per stick. Lyte Lab treats that as a formula distinction, not diet advice.
Which one is closer to an ORS-style label?+
Liquid I.V. is closer because it pairs 500mg sodium with 11g sugar and 380mg potassium. Nuun has lower sugar and an effervescent tablet system, so it is a different formula category.
What about flavor — which is better?+
Subjective, but both have done real flavor work. Nuun's citrus and tropical SKUs are more subtle, stevia-forward, and lower-calorie; the Watermelon and Tri-Berry are particularly dialed. Liquid I.V.'s flavor system is sweeter and more pronounced (sugar will do that) — Lemon-Lime is the classic, and the seasonal SKUs rotate often. Personal preference matters here. Both are easy to get to ~80% of with a DIY at 5¢ per serving plus citric acid + extract + stevia, but the last 20% is genuine R&D.
Can I use both?+
Yes. The builder can model Nuun's lower-sugar tablet-inspired profile and Liquid I.V.'s sugar-plus-electrolyte profile as separate presets. That is useful for cost and ingredient comparison, not personal hydration guidance.

Sources & references

  1. Oral Rehydration Salts: Production of the New ORS — World Health Organization
  2. Coupling between Na+, sugar, and water transport across the intestine (Wright & Loo, 2000) — PubMed (U.S. National Library of Medicine)
  3. Magnesium bioavailability from magnesium citrate and magnesium oxide (Lindberg et al, 1990) — PubMed (U.S. National Library of Medicine)
  4. Sweating Rate and Sweat Sodium Concentration in Athletes: A Review (Baker, 2018) — PubMed (U.S. National Library of Medicine)

More head-to-heads