DIY Nuun Sport: same electrolytes, minus the fizz

magnesium oxide is less soluble and generally less bioavailable than better-supported forms such as citrate, glycinate, or malate. Nuun chose oxide for cost; LMNT chose malate. At 25mg per tablet either choice is small, so the DIY recipe can either match the label or model an alternate form.

Not really. Effervescent tablets need a tablet press, a binder, food-grade citric acid + sodium bicarbonate in the right ratio for the fizz, and a controlled-humidity environment to keep them from activating in the bottle. It is doable as a hobbyist project — there are a few YouTube tutorials and Indian-pharma supply chains that sell small tablet presses — but the time and equipment investment dwarfs the savings unless you genuinely enjoy the process. The pragmatic DIY path is powder.

Different positioning. LMNT lists about 3x the sodium (1000mg vs Nuun's 300mg). Liquid I.V. uses a higher-sugar ORS-inspired profile. Nuun Sport sits in the middle: modest sodium, low sugar, lower per-serving price, and an effervescent tablet format. A custom DIY can model higher sodium targets, but Lyte Lab does not recommend a dose for training, diet, or heat exposure.

13mg of calcium per serving is functionally cosmetic — it is not a meaningful calcium dose against a daily 1000mg target, and calcium is not a primary sweat-loss concern at typical activity levels. The DIY recipe matches the dose for honesty in the comparison table, but you can drop calcium entirely without affecting how the drink works. Nuun likely includes it because the marketing reads better with four electrolytes than three.

Without flavor work, no. Nuun's citrus and tropical SKUs are dialed and the stevia + natural flavor system is part of the appeal. A bare DIY at the matched electrolytes will taste like saline with a faint bitter edge from the magnesium. Two cheap fixes: (1) add citric acid (200-300mg per serving) and a citrus extract or a True Lemon packet, and (2) add stevia or monk fruit to taste. With those, you are in the same flavor neighborhood — not a clone.

The tablet format is the hard-to-copy part. A tube of Nuun is more portable than a baggie of powder that needs measuring. The tradeoff is convenience versus ingredient cost: the powder DIY models the macros cheaply, but it does not recreate the compressed effervescent tablet.

The 300:150 ratio (2:1) is in the neighborhood of common sweat-composition references, though individual losses vary heavily. A DIY model can preserve the label ratio or change sodium and potassium independently for comparison.