Box score
Per serving · from the label · Sep 30, 2026| Serving | Calories | Carbs | Sodium | Protein | Caffeine | Cost / serving |
|---|---|---|---|---|---|---|
| 1 tablet (5 g) in 16 fl oz water, any of the 6 flavors | 15 | 4 g | 300 mg | 0 g | Not listed | $0.55 |
Source: the six Nutrition Facts panels (Orange, Tropical, Grape, Tri-Berry, Lemon Lime, Fruit Punch) pictured on the Amazon listing, which match the panel on Nuun's own Nuun Sport page; read Sep 30, 2026. All six list the same numbers. Cost: $32.72 for 60 tablets = $0.55 each. Sodium is the amber cell because it is what the tablet is for. None of these six flavors lists a caffeine source; the separate Nuun Sport + Caffeine line carries 40 mg per tablet (see below).
Normal drinking and meals usually cover the lead-up.
Flavored, lightly salted water for longer or sweatier sessions.
Water with a salted meal does the same job for most people.
Nuun says up to three a day; not needed as a default drink.
Scouting report
Facts, not hypeStrengths
- 300 mg sodium plus 150 mg potassium, 25 mg magnesium and 13 mg calcium per tablet.
- Only 1 g of sugar and 15 calories, so it adds flavor and salt without much else.
- Tubes of 10 are small and easy to carry; about $0.55 a tablet on our date.
Limits
- 4 g of carbohydrate is not a meaningful amount of fuel for long sessions.
- Sweetened partly with stevia leaf extract, which some people dislike.
- A caffeinated version (Nuun Sport + Caffeine) uses very similar tubes.
- No sport certification shown.
Best use
- Sessions over about an hour, in heat, or when you sweat heavily and want something with a little salt.
- For a typical 30–60 minute workout, plain water is generally enough.
What the label shows
The mixed pack holds one tube each of Orange, Tropical, Grape, Tri-Berry, Lemon Lime and Fruit Punch, 10 tablets per tube. We read all six Nutrition Facts panels in the listing images on Sep 30, 2026; the numbers are identical across flavors, and only the flavor and color ingredients differ. One inconsistency on the listing: its bullet text names Strawberry Lemonade instead of Orange, while the box photo and the panel image show Orange, so the sixth flavor you receive may vary.
| Nutrient or ingredient | Per tablet | What to know |
|---|---|---|
| Calories | 15 | From the 4 g of carbohydrate. |
| Sodium | 300 mg (13% DV) | From sodium carbonate and sodium bicarbonate. |
| Potassium | 150 mg (4% DV) | Potassium bicarbonate and chloride. |
| Magnesium | 25 mg (6% DV) | As magnesium oxide. |
| Calcium | 13 mg (2% DV) | As calcium carbonate. |
| Chloride | 40 mg (2% DV) | Listed on the panel. |
| Total carbohydrate | 4 g (1% DV) | Includes 1 g total sugars, all added. |
| Sweetener | Dextrose + stevia | Stevia leaf extract appears in all six ingredient lists. |
| Directions (brand) | 1 tablet / 16 fl oz | Nuun's page: drop one tablet in 16 fl oz of water and let it dissolve; up to 3 servings a day. |
What the evidence shows
The case for any electrolyte tablet rests on sweat. The American College of Sports Medicine's fluid-replacement position stand notes that sweat rates and sweat electrolyte content vary considerably between people, recommends individualized plans, and says electrolyte and carbohydrate drinks can offer benefits over water alone under certain circumstances, not all [1]. The National Athletic Trainers' Association statement gives the spread: sweat sodium concentrations from about 10 to 100 mEq/L, and measured sodium losses from 0.2 to 7.3 g per hour [2]. It suggests adding carbohydrate, electrolytes or both for sessions longer than an hour or with intense intervals, and says sodium supplementation should be individualized and practiced in training [2].
Mixed as directed, one tablet in 16 fl oz (about 0.47 L) gives roughly 28 mmol of sodium per liter. That sits within the range of sweat sodium NATA cites, toward the lower-middle, so a heavy, salty sweater drinking this may still replace only part of what they lose. For people who sweat lightly and train for under an hour, the same guidance points to water being adequate.
The tablet is not a carbohydrate source. At 4 g per tablet, it is far below the 30–60 g per hour that sports-nutrition guidance discusses for long sessions [3], so on a long ride you would still need food, chews or a carbohydrate drink.
Nuun Sport + Caffeine is a separate product in very similar blue tubes; Nuun's page lists 40 mg of caffeine per tablet from green tea extract. This mixed pack is the caffeine-free line, but if you buy singles or restock, read the tube. Separately, NATA's statement warns against drinking more fluid than you lose; drink to a plan or to thirst rather than forcing extra bottles [2].
Game plan: using it in a session
A practical sequence, not a guarantee of any outcome.
Decide if you need it
Under an hour, cool weather, light sweating: plain water. Longer, hotter or visibly salty sessions: consider a tablet.
Mix it right
One tablet in 16 fl oz of water; wait a few minutes for it to dissolve before capping the bottle.
Sip through the session
Drink to thirst or to a plan built from your own sweat rate, not to a fixed number of bottles.
Add fuel separately
If the session is long enough to need carbohydrate, bring food or chews; the tablet will not supply it.
Price and where it is sold
On Sep 30, 2026, the Nuun Sport mixed-flavor 6-tube pack (60 tablets) listed at $32.72, in stock, shipped and sold by Amazon.com, and marked non-returnable due to food safety reasons. That works out to $0.55 per tablet. Single-flavor packs appear on the same listing at different prices and counts.
Who should look elsewhere
- Anyone told to limit sodium or potassium, or who takes prescription medicines that affect fluid or electrolyte balance, should ask a clinician or pharmacist first.
- Anyone avoiding caffeine should double-check they have the plain Nuun Sport tubes, not Nuun Sport + Caffeine.
- Anyone who needs carbohydrate during long sessions; a carbohydrate drink mix such as Skratch Labs or chews fit that job better.
- Anyone who dislikes stevia or fizz; an unsweetened salt stick or a non-carbonated mix may suit better.
Sources
- American College of Sports Medicine. Position stand: exercise and fluid replacement. Medicine & Science in Sports & Exercise, 2007 (PMID 17277604). link
- National Athletic Trainers' Association. Position statement: fluid replacement for the physically active. Journal of Athletic Training, 2017 (PMID 28985128). link
- International Society of Sports Nutrition. Position stand: nutrient timing. Journal of the International Society of Sports Nutrition, 2017 (PMID 28919842). link
- Nuun. Nuun Sport and Nuun Sport + Caffeine product pages (nutrition, directions, caffeine per tablet), nuunlife.com, accessed Sep 30, 2026.
- Amazon listing B01AMVB87A: title, price, seller, return status and the six-flavor Nutrition Facts image, viewed Sep 30, 2026. NSF Certified for Sport product directory (nsfsport.com), searched Sep 30, 2026: no Nuun products listed.
This entry is educational and is not medical advice. Ask a qualified clinician before changing how you eat, drink or supplement around exercise, especially if you are pregnant, nursing, have an existing condition, or take medication.