LMNT and Nuun are two of the most talked-about electrolyte products in the fitness space, and I have used both long enough to form a real opinion. LMNT is built for athletes who sweat heavily or follow a low-carb diet.
Nuun is a convenient tablet aimed at everyday hydration and casual exercisers. They serve different crowds, and that gap matters when you are trying to pick one.
After running through both products across morning sessions, afternoon lifts, and long weekend hikes, the differences became clear quickly. LMNT packs a serious sodium punch.
Nuun keeps things light and portable.
Neither product is perfect, though. There is a third option I keep coming back to, and it covers gaps that both LMNT and Nuun leave open.
Quick Verdict
LMNT wins for heavy training and keto athletes who need high sodium without sugar. Nuun is a solid budget pick for casual hydration and everyday use.
Both products have real limitations, and if you want a formula that covers all the bases, including citrate-form minerals, a full B vitamin complex, and third-party lab testing, Athletic Insight Hydration Electrolyte Powder is the stronger choice at a competitive price.
What Is LMNT
LMNT is a zero-sugar electrolyte powder developed by Robb Wolf and the team at Elemental Labs. It was designed specifically for people following ketogenic or low-carbohydrate diets, where sodium loss through urine and sweat is accelerated.
Each stick pack delivers 1000mg sodium, 200mg potassium, and 60mg magnesium, with no added sugar, fillers, or artificial colors.
The brand markets itself heavily toward athletes, CrossFit communities, and keto followers. It comes in a range of flavors and is sold in boxes of 30 stick packs.
The price sits at $45 per box, which puts it on the premium end of the electrolyte market.
Pros
- Very high sodium dose suits heavy sweaters and keto users
- Zero sugar in every flavor
- Clean, short ingredient list
- Strong flavor variety with no artificial sweetener aftertaste in most options
- Stick packs are convenient for travel and gym bags
Cons
- No calcium in the formula
- No B vitamins for energy support
- $1.50 per serving is expensive compared to most competitors
- Sodium level may be too high for casual or light exercisers
- No third-party certificate of analysis publicly available
What Is Nuun
Nuun is a tablet-based electrolyte brand based in Seattle. The tablets dissolve in water and cover a lighter electrolyte profile than LMNT.
Nuun Sport, the core product, provides 360mg sodium, 100mg potassium, 25mg magnesium, and 13mg calcium per tablet. It contains 1g of sugar per serving, which is low enough to be considered nearly sugar-free.
Nuun is stocked in running specialty stores, pharmacies, and major online retailers, making it one of the most accessible electrolyte products on the market. The brand also offers a caffeinated version called Nuun Energy.
At roughly $0.80 per serving, it is significantly more affordable than LMNT.
Pros
- Very affordable at under $1 per serving
- Includes calcium, which LMNT does not
- Tablet format dissolves quickly and travels well
- Widely available in physical retail locations
- Caffeinated variant (Nuun Energy) adds flexibility
Cons
- Lower sodium dose may not be adequate after intense or prolonged exercise
- No B vitamins included
- 1g sugar per tablet, which some keto users want to avoid
- Tablet format can be slower to dissolve in cold water
- No publicly available third-party lab testing
LMNT vs. Nuun Main Differences
Ingredients
Both products share the three core electrolytes: sodium, potassium, and magnesium. These minerals are critical for fluid balance, muscle contraction, and nerve signaling during exercise.[1]
That is where the overlap ends.
LMNT stops at those three electrolytes and adds nothing else. There is no calcium, no vitamins, and no supporting micronutrients.
The formula is intentionally minimal, which suits the brand's keto-focused audience where dietary fat and protein intake already covers many micronutrient needs.
Nuun adds calcium at 13mg per tablet, which plays a role in muscle function and bone density. Magnesium, present in both products, has strong research backing for its role in exercise performance and recovery.[2]
Neither product includes B vitamins, which support cellular energy production during sustained activity.[3] That gap is one reason Athletic Insight Hydration Electrolyte Powder stands out, as it includes a full B vitamin complex alongside citrate-form minerals for improved absorption. You can read more in our Athletic Insight Hydration review.
Dosages
LMNT delivers 1000mg of sodium per serving, which is three times what Nuun Sport provides at 360mg. For someone losing 1,500mg or more of sodium per hour during intense training, LMNT's dose is meaningful.
For a casual 30-minute walk, it is likely overkill.
Potassium follows the same gap: LMNT provides 200mg versus Nuun's 100mg. Magnesium is 60mg in LMNT and 25mg in Nuun.
If your main concern is replacing what you lose during hard training sessions, LMNT's numbers are more relevant. For everyday sipping or light activity, Nuun's doses are functional without being excessive.
Third Party Testing
Neither LMNT nor Nuun publishes a certificate of analysis or discloses third-party testing results on their main product pages. This is a meaningful gap for athletes subject to drug testing or anyone who wants independent verification of label accuracy.
Athletic Insight Hydration Electrolyte Powder is lab-tested and provides a certificate of analysis, which is a clear differentiator.
User Reviews
LMNT receives consistent praise for its taste, particularly from keto and low-carb communities who find most electrolyte drinks too sweet. Common criticisms focus on the price and the fact that the sodium level feels aggressive outside of heavy training contexts.
Nuun earns strong marks for convenience and affordability. Runners and cyclists frequently recommend it for race-day hydration.
The most common complaints relate to the tablet needing time to fully dissolve and the electrolyte doses being too low for prolonged high-output sessions. If you are comparing Nuun to other hydration options, our Nuun vs Pedialyte comparison covers that in detail.
Price
| Product | Package | Servings | Price | Price Per Serving |
|---|---|---|---|---|
| LMNT | 30 stick packs | 30 | $45.00 | $1.50 |
| Nuun Sport | 10 tablets | 10 | $7.99 | $0.80 |
| Athletic Insight Hydration Powder | 30 servings | 30 | $34.99 ($29.74 on subscription) | $1.17 ($0.99 on subscription) |
My Experience Taking LMNT And Nuun
I ran both products for several weeks, rotating them across different training days and conditions. LMNT went into my pre-lift and intra-workout routine on heavy compound days.
Nuun became my morning hydration tablet on lighter days and rest days.
The taste difference is noticeable immediately. LMNT's citrus salt flavor has a savory edge that takes some getting used to.
After a few sessions, it started to feel natural, and I could tell the high sodium was doing something. Nuun tastes more like a mild sports drink and blends in easily without demanding your attention.
Performance-wise, LMNT held up better during sessions lasting 60 to 90 minutes. I felt fewer late-set cramps and my focus stayed steadier into the final sets.
Nuun worked fine for shorter sessions but felt thin during anything intense. There was no energy crash from either product, which I expected given the low sugar content in both.
On rest days, LMNT felt like too much sodium. I noticed slight water retention and a heavier feeling when I used it outside of training.
Nuun fit rest days better, with a lighter dose that did not feel like I was flooding my system. Neither product gave me the sustained energy I noticed when I later tested Athletic Insight Hydration, where the B vitamin complex added a functional layer that both LMNT and Nuun lack.
Should You Take LMNT Or Nuun
Athletic Insight Hydration Electrolyte Powder is the best option for most people who want a complete electrolyte formula. It uses citrate-form sodium, potassium, magnesium, and calcium for better absorption than standard mineral salts.
It includes a full B vitamin complex, is zero added sugar, and is lab-tested with a published certificate of analysis. At $34.99 for 30 servings, it is cheaper than LMNT and more complete than Nuun.
LMNT still makes sense for someone deep into a ketogenic diet who needs high sodium specifically. The minimal formula works if you have no interest in added vitamins and just want to replace sweat losses during intense training.
Nuun remains a reasonable pick for someone who wants a low-cost, portable option for casual hydration or occasional exercise, and it has the advantage of being available at most running shops and pharmacies.
If you are training seriously and want every element of hydration covered without overpaying, Athletic Insight Hydration Electrolyte Powder is where I would put my money.
References
- Sawka, M. N., Burke, L. M., Eichner, E. R., Maughan, R. J., Montain, S. J., & Stachenfeld, N. S. (2007). American College of Sports Medicine position stand: Exercise and fluid replacement. Medicine and Science in Sports and Exercise, 39(2), 377-390. https://pubmed.ncbi.nlm.nih.gov/17277604/
- Nielsen, F. H., & Lukaski, H. C. (2006). Update on the relationship between magnesium and exercise. Magnesium Research, 19(3), 180-189. https://pubmed.ncbi.nlm.nih.gov/17172008/
- Kennedy, D. O. (2016). B vitamins and the brain: Mechanisms, dose and efficacy — a review. Nutrients, 8(2), 68. https://pubmed.ncbi.nlm.nih.gov/26828517/