Best Electrolyte Tablets for Triathletes (2026)
Last updated 2026-04-16 · Reviewed by Bryan Collins
If you cramp on long bricks or finish races caked in salt, your hydration needs more than water. We picked these tablets and drink mixes based on sodium per serving, ease of use during a race, and GI tolerance — the three things that actually decide whether your fuelling holds up at the back end of a 70.3 or Ironman.
Who this list is for
- • Triathletes racing 70.3 or Ironman in warm or hot conditions.
- • Athletes who salt-streak their kit or cramp late in races.
- • First-timers looking for a safe starting-point hydration stack.
Who it is not for
- • Pure sprint racers — plain water usually covers a 1-hour race.
- • Athletes with sodium-sensitive medical conditions (check with a clinician).
What to look for
- Sodium per serving — most heavy sweaters need 700–1000 mg/hour
- Carb content — pure electrolyte mixes vs hybrid drink mixes
- GI tolerance — fizzy tablets vs flat powders behave very differently
- Format — tablets are travel-friendly, mixes are easier to scale up
At a glance
| Product | Best for | Link |
|---|---|---|
| Nuun Sport tablets | Daily hydration and lighter sweaters | Check price |
| SaltStick caps | Heavy sweaters who need to add sodium without flavour fatigue | Check price |
| Precision Hydration tablets | Triathletes who have done a sweat-sodium test | Check price |
| LMNT drink mix | Athletes following a low-carb / fasted training approach | Check price |
| Skratch Labs Sport Hydration | Bottle mixes for the bike leg | Check price |
1. Nuun Sport tablets
Best for: Daily hydration and lighter sweaters
The everyday tablet most triathletes start with. ~300 mg sodium per tab, fizzy and easy on the stomach. Pair with caps if your sweat rate is high.
Pros
- + Cheap per serving
- + Easy on the stomach
- + Tastes good for hours
Cons
- − Sodium too low for heavy sweaters on its own
- − Carb content minimal
2. SaltStick caps
Best for: Heavy sweaters who need to add sodium without flavour fatigue
~215 mg sodium per cap, plus potassium, calcium and magnesium. Take 1–2 per hour to top up alongside any drink mix.
Pros
- + Flavourless — no GI distraction
- + Easy to dose precisely
- + Travels well
Cons
- − Need water to swallow
- − Easy to forget mid-race
3. Precision Hydration tablets
Best for: Triathletes who have done a sweat-sodium test
Available in multiple sodium strengths (250–1500 mg/L) so you can match the actual sodium concentration of your sweat. Best when paired with a sweat test.
Pros
- + Strength matches your sweat profile
- + Trusted by Ironman age-groupers and pros
Cons
- − More expensive
- − Best value once you know your sweat numbers
4. LMNT drink mix
Best for: Athletes following a low-carb / fasted training approach
1000 mg sodium per packet, zero carbs. Useful for fasted morning sessions and for carrying high sodium without the sugar load.
Pros
- + Very high sodium per serving
- + Zero sugar / carbs
- + Strong flavours
Cons
- − Salty taste is divisive
- − No carbs — pair with gels in racing
5. Skratch Labs Sport Hydration
Best for: Bottle mixes for the bike leg
Light carb + electrolyte mix that tastes like real fruit. Made for sipping over hours without the fizzy-tablet bloat.
Pros
- + Real-fruit flavour, easy on the gut
- + Light carbs included
Cons
- − Sodium ~380 mg per serving — top up with caps if you sweat hard
Our picks by use case
Cheap, tasty, travels well, good sodium for moderate sweaters.
Stack caps on top of drink mix to hit 1,000+ mg/hr without flavour fatigue.
Multiple strengths matched to sweat-sodium concentration.
1,000 mg sodium, zero carbs — ideal fasted training and pre-race loading.
Use these calculators to pick the right product
Frequently asked questions
How many electrolyte tablets should I take per hour?
Aim for 500–1000 mg of sodium per hour as a starting point. Heavy sweaters can need 1500 mg+. Use the Sweat Rate Calculator to get your number, then adjust in training.
Should I take electrolytes before or during the race?
Both. A high-sodium drink 60–90 minutes before the swim helps you start hydrated. Then take 500–1000 mg/hour during the bike and run depending on conditions.
Will electrolyte tablets stop cramps?
Sometimes. Cramps are partly fuelling, partly fatigue and partly sodium. Dialling sodium fixes a lot of late-race cramps but is not a guarantee.
Can I take too many electrolytes?
Yes — over-dosing sodium without enough water can cause GI distress; the bigger danger is hyponatremia from drinking too much plain water. Pair sodium with measured fluid intake.
How we chose these picks
We picked products that are widely available, used by Ironman age-group athletes, and that solve a specific problem (light hydration, heavy sweat, low-carb, bottle mix). All are linked to Amazon — we earn a small commission at no cost to you.