7.5Good
A doctor-developed, ORS-style mix with 330 mg sodium per 8 oz, one of the stronger drinks in its class, backed by a small randomized trial. Pricier than it looks.
Kosher
4 videos$1.12/serving
Nuun Best Overall · Hydration & Electrolytes
Sport Electrolyte Tablets
Informed Choice-certified fizzy tablets with 300 mg sodium and 1 g sugar per 16 oz: clean, affordable everyday and workout hydration, but light for salty sweaters.
7.9
Good
Nutrition Reviews score
Weighted across efficacy, quality, value, experience & transparency. See breakdown
- Form
- Tablet
- Serving
- 1 tablet (5 g) in 16 oz water
- Servings
- 10
- Per serving
- $0.75
Informed ChoiceCertified Gluten-FreeKosherCertified VeganNon-GMO Project Verified
VeganGluten-freeNon-GMOKeto-friendly
Check price on AmazonBuy from the brand$7.49
We may earn a commission when you buy through these links — it never affects our scores. How we make money
Last reviewed September 29, 2026 by the Nutrition Reviews Editorial Team · How we review
Our verdict
Nuun Sport is a well-certified, low-sugar and reasonably priced way to add electrolytes to everyday drinking and moderate workouts, which makes it our pick for general and athletic use under an hour or two. Heavy sweaters and anyone battling illness-related dehydration should look to a higher-sodium mix or a medical ORS instead.
Best for
- Everyday hydration with minimal sugar
- Gym sessions, runs and rides of moderate length
- Tested-athlete use (Informed Choice)
Skip it if
- Heavy or salty sweaters needing 500-1,000+ mg sodium
- Illness-related dehydration
- People who dislike fizzy drinks
How it scored
Our five-factor score out of 10. Factors are weighted by how much they matter to the outcome you’re paying for. Methodology
7.9
Goodout of 10
- Efficacy30%7.0
Key ingredients at clinically studied doses, and how strong the evidence is.
- Quality & Purity25%8.8
Third-party testing and certifications, manufacturing standards, contaminant testing, recall history.
- Value20%8.2
Cost per effective serving compared with category peers.
- Experience15%7.5
Taste, mixability, texture and tolerability from aggregated buyer and creator feedback.
- Transparency10%8.8
Full label disclosure (no proprietary blends), available COAs, honest marketing.
Our review
Nuun Sport is the drop-in effervescent tablet that many runners and cyclists have kept in their gym bags for years. One tablet dissolved in 16 oz of water provides 300 mg sodium, 150 mg potassium, 25 mg magnesium, 13 mg calcium and 40 mg chloride, with 1 g of sugar and 15 calories. It is sweetened with a little dextrose plus stevia, and each tube holds 10 tablets.
This is a lighter formula than the salt-heavy mixes that dominate social media. The American College of Sports Medicine notes that sweat rates and sweat sodium vary widely between people, so 300 mg per bottle suits everyday hydration, gym sessions and moderate runs, while heavy or salty sweaters, long efforts in the heat and ultra-endurance athletes may need more sodium or a second tablet. It is also not a medical oral rehydration solution for illness, which provides far more sodium and glucose.
Quality credentials are a real strength. Nuun Sport appears in the Informed Choice certified-product listings, a program run by LGC that aims to reduce the risk of impurities and banned substances in supplements, and Nuun's site lists Certified Gluten Free, Kosher (OU), Certified Vegan and Non-GMO Project Verified status. Every flavor's ingredient list is published on the product page.
buyers consistently call it an easy, effective routine staple and like the near-zero sugar, but taste divides people, from loved to 'horrible', and some creators find the flavor faint and wait a while for tablets to dissolve. One runner-creator's pet peeve is the snug tube that makes it hard to shake out a single tablet. At about $0.53-$0.75 per tablet, it is one of the better values in the category.
What’s inside
| Key ingredient | Per serving | Why it matters |
|---|---|---|
| Sodium 13% of the Daily Value; modest dose aimed at everyday and moderate training use. | 300 mg | 13% of the Daily Value; modest dose aimed at everyday and moderate training use. |
| Potassium Supports fluid balance; 4% of the Daily Value. | 150 mg | Supports fluid balance; 4% of the Daily Value. |
| Magnesium Small amount, 6% of the Daily Value. | 25 mg | Small amount, 6% of the Daily Value. |
| Sugar (dextrose) Minimal; the tablet is mainly sweetened with stevia. | 1 g | Minimal; the tablet is mainly sweetened with stevia. |
Nutrition Facts
Serving Size 1 tablet (5g)
Servings Per Container 10
Amount Per Serving% Daily Value
Calories 15
Total Fat 0 g0%
Sodium 300 mg13%
Total Carbohydrate 4 g1%
Total Sugars 1 g
Includes Added Sugars 1 g2%
Protein 0 g
Calcium 13 mg2%
Potassium 150 mg4%
Magnesium 25 mg6%
Chloride 40 mg2%
* Percent Daily Values are based on a 2,000 calorie diet. † Daily Value not established.
Other ingredients: Citric Acid, Dextrose, Sodium Carbonate, Sodium Bicarbonate, Potassium Bicarbonate, Natural Flavor, And Less Than 2% Of Potassium Chloride, Magnesium Oxide, Calcium Carbonate, Stevia Leaf Extract, Avocado Oil, Riboflavin (For Color)
Flavors & variants
Lemon LimeStrawberry LemonadeCitrus FruitWatermelonFruit PunchGrapeTri-BerryTropical
Testing & quality
Nuun Sport tablets appear in LGC's Informed Choice certified-product listings; the brand also lists Certified Gluten Free (GIG), Kosher (OU), Certified Vegan and Non-GMO Project Verified status, and Informed Sport certification for some products.
Creator video reviews
Independent creators reviewing Sport Electrolyte Tablets on TikTok and YouTube.
3 positive2 mixed0 critical
Pros & cons
What we like
- Informed Choice certified, plus gluten-free, kosher, vegan and Non-GMO Project certifications
- Only 1 g sugar and 15 calories per tablet
- Portable tablet that fits in a pocket or water-bottle routine
- About $0.53-$0.75 per serving
Watch-outs
- 300 mg sodium is modest for long or hot sessions
- Taste is polarizing and some flavors are faint
- Tablets can be slow to dissolve and hard to shake out of the tube
- Not suitable as a replacement for a medical ORS
Questions buyers ask
How many Nuun Sport tablets can I use per day?
Nuun says each tube's tablets can be taken up to three times a day, one tablet per 16 oz of water. That totals up to 900 mg of sodium, so factor it into your daily intake if you watch your salt, and remember that heavy sweaters may need more sodium during long sessions.
Is Nuun Sport safe for drug-tested athletes?
Nuun Sport appears in the Informed Choice certified-product listings, a program run by LGC that tests supplements to reduce the risk of impurities and banned substances. No certification removes all risk, so tested athletes should confirm the product's current listing on the Informed Choice website before competition.
Is Nuun Sport enough for heavy sweaters?
Often not on its own. At 300 mg sodium per 16 oz it is lighter than high-sodium mixes, and sweat sodium losses vary widely from person to person. Salty sweaters doing long sessions in the heat may need more sodium, from a stronger mix, a second tablet or salty food.
Sources we checked (9)
- 1.nuunlife.com/products/nuun-sport
- 2.nuunlife.com/products.json?limit=250
- 3.nuunlife.com/pages/reasons-to-believe
- 4.choice.wetestyoutrust.com/search/node?keys=nuun
- 5.choice.wetestyoutrust.com/supplement-search/nuun-hydration/nuun-hydration-sport
- 6.nestlehealthscience.com/brands/nuun
- 7.amazon.com/dp/B018NZJC70
- 8.pubmed.ncbi.nlm.nih.gov/17277604/
- 9.choice.wetestyoutrust.com/
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The pharmacy-standard rehydration mix: 260 mg sodium, 180 mg potassium and 6 g sugar per 8 oz packet. Dependable when sick, but pricey per ounce.
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