Ethan BrooksBy Ethan Brooks

Updated November 2026

SiS energy gels with electrolytes supply fast-acting carbohydrates plus sodium and other minerals lost in sweat. For most runs under 60 minutes, you don’t need them. For longer efforts in heat or humidity, they can help you hold pace and reduce the risk of cramping, as long as you pair them with enough fluid and practice the plan before race day.

Why Electrolytes Matter in a Gel

Your body loses sodium through sweat, and the amount varies widely between runners. A carbohydrate gel delivers energy on its own, but it does not replace what you lose. Sodium helps your muscles contract and helps your body hold onto fluid. When it drops too low over several hours, you may notice heavy legs, dizziness or cramping.

Shopping for one? See our guide: SiS GO Energy Gels Review: Features and Performance.

Adding electrolytes to a gel is a convenience. It lets you take in some sodium with your carbohydrates without having to mix a separate drink. That matters most when a race aid station offers only plain water or when you run with a handheld and want a simpler plan.

Factors That Change How You Should Use Them

Several variables decide whether electrolyte gels belong in your fueling plan:

  • Run duration. Most runners need carbohydrates once effort passes about 60 to 90 minutes. Electrolytes become more important the longer you go.
  • Temperature and humidity. Hot, humid conditions increase sweat rate and sodium loss.
  • Sweat profile. Some people leave white salt crusts on their clothing or hat. If you do, you probably lose more sodium and may need more of it.
  • Fluid intake. Taking a gel without enough water can cause stomach discomfort. Taking too much plain water while losing sodium can contribute to hyponatremia, a serious condition where blood sodium falls too low.
  • Your stomach. Gut tolerance varies. Some runners handle gels well at race pace; others get nausea.

What to Do About It

The goal is to build a plan you can repeat without surprises. Start by testing in training, not on race day.

  1. Use a gel during your long runs, starting around 45 to 60 minutes in, and note how your stomach feels.
  2. Take each gel with water, usually a few sips, to help it go down and digest. Do not wash it down with large volumes of plain water alone.
  3. Spread intake out. Many runners take one gel roughly every 30 to 45 minutes, but check the label and your own tolerance.
  4. Track your sweat on hot days. A salty residue or a large weight drop after a run suggests you may benefit from more sodium.
  5. If you feel cramping, dizziness or confusion late in a run, slow down and get medical help if symptoms are severe. Consult a physician or sports dietitian before making major changes to your fueling, especially if you have a heart, kidney or blood pressure condition.

Practical Tips for Race Day

  • Use only products you have tested in training. Never try a new gel for the first time in a race.
  • Carry the gels in a pocket or a race belt you have already worn on long runs.
  • Match your fluids to your gels. Check the aid station schedule so you know when water or sports drink is available.
  • Consider your total sodium. Electrolyte gels help, but in very hot races some runners add salt tablets or a sports drink as well.

What We’d Use

If you want a SiS-style gel with added electrolytes, look at the brand’s electrolyte-containing options first. For a first-time test, a single-flavor pack lets you check taste and stomach tolerance before buying more.

SiS GO Electrolyte Gel is a common pick for runners who want carbohydrates and sodium in one pouch. View on Amazon

For runners who prefer to build their own sodium strategy, a standalone electrolyte tablet can be paired with plain carbohydrate gels. View on Amazon

Before you commit, read how these gels are timed in a long run. When to Take SiS Energy Gels: A Timing Guide for Runners (2026) explains spacing, and SiS Energy Gels Nutrition Facts: What Each Gel Gives You (2026) breaks down the carbohydrate and sodium content so you can plan intake accurately.

Do I need electrolytes in my energy gel?

Not always. For runs under about an hour, most people do not need added sodium. For long or hot runs, electrolytes can help replace what you lose in sweat.

Can I take an electrolyte gel without water?

You can, but it is better to take a few sips of water with it. Taking gels without any fluid can upset your stomach and make them harder to swallow.

How many electrolyte gels can I take in one run?

Many runners take roughly one gel every 30 to 45 minutes, but the right number depends on your body and the product label. Test your plan in training first.

Are electrolyte gels better than sports drinks?

Neither is better for everyone. Gels are portable and easy to carry. Sports drinks supply fluid and carbohydrates together, which some runners find simpler during long efforts.

Ready to choose one?

Ethan Brooks

About Ethan Brooks

Ethan Brooks is part of our editorial team and reviews and edits our marathon & half-marathon guides, checking product details against manufacturer specifications and owner feedback.