Find your sodium Level before your next race
Every runner sweats out a different amount of sodium. LEVELEN's at-home Sweat Test measures yours and matches you to a mix at your Level. Keep The Pace runners get 20% off a first Sweat Test or Starter Kit.
The buttons below apply the code for you. Free US shipping on every order.
- Test during a run you were already doing
- Results by email 1 to 2 weeks after the lab gets your sample
- Free US shipping and prepaid return mailer
Start with a Starter Kit
A Starter Kit is the Sweat Test plus your first pouch of mix. Once your results are in, the pouch ships at your Level, so you can train with it right away.
Starter Kit, Single Sport
For runners who train in one sport.
$228 value if bought separately
- Sweat Test for one session
- Your Individual Sweat Profile and Level by email
- First pouch of mix, matched to your Level
- Prepaid return mailer and free US shipping
Starter Kit, Endurance / MultiSport
For triathletes, or runners who want two tests (say, a cool day and a hot day).
$288 value if bought separately
- Sweat Test for two sessions, one athlete
- Two Individual Sweat Profiles by email
- First pouch of mix, matched to your Level
- Prepaid return mailer and free US shipping
Just want the test?
Single Sport $111.20 (was $139.00). Endurance $159.20 (was $199.00). Prices with KEEPTHEPACE.
KEEPTHEPACE works on a first LEVELEN order, once per customer, through January 31, 2027. It covers the Sweat Test and Starter Kits, not mix on its own. If you've ordered from LEVELEN before, checkout will remove the code once you enter your email.
Why Coach Kyle uses LEVELEN
Before finding LEVELEN, I felt like I was shooting in the dark with my nutrition. Since taking the sweat test and using LEVELEN Level 5, I have noticed a dramatic improvement in my overall performance. If you're serious about becoming a better runner or endurance athlete, getting a LEVELEN sweat test is a no-brainer, and using LEVELEN is a no-brainer.
Kyle Bergman coaches with Keep The Pace and is a LEVELEN growth partner. Individual experiences vary.
How the Sweat Test works
You test during a normal training run. Wear the patch, mail it back, and get your Level.
- Order
Your kit ships
Sweat patch, collection vial, tweezers, prep pads, instructions and a prepaid return mailer (US).
- Test day
Run as usual
Wear the patch on your forearm for 30 to 60 minutes of a normal session. Weigh in before and after and note what you drink, so the lab can work out your sweat rate.
- After your run
Mail it back
Move the gauze into the vial with the tweezers and send it back in the prepaid mailer.
- 1 to 2 weeks after the lab gets it
Get your Level
Your Individual Sweat Profile arrives by email with your Level and plan. Starter Kits then ship your first pouch at that Level.
The typical endurance athlete loses about 1,500 mg of sodium an hour
Sodium loss varies a lot from one runner to the next, so a one-size electrolyte drink can be too little for some and more than others need. The Sweat Test measures your number, and the lab assigns one of three Levels, each with a matching mix.
Median sodium loss across more than 4,000 endurance-athlete sweat tests run by LEVELEN since 2016. Testing is run by the lab of LEVELEN co-founder Dr. Sandra Fowkes Godek, PhD, ATC, using LEVELEN's patented method (US Patent 9,421,226).
Official LEVELEN partnerWhy LEVELEN and Keep The Pace
Keep The Pace is a New York run club and coaching team: personalized 1:1 coaching, weekly group runs, and seven certified coaches who still race. From a first 5K to a marathon PR, the club trains with a plan.
LEVELEN gives those runners a way to dial in hydration with their own sweat data instead of guesswork. The code is our thank-you to the community.
Good to know
How do I use the code?
The buy buttons on this page add the kit to your cart with KEEPTHEPACE already applied. If you shop elsewhere on the site, enter KEEPTHEPACE at checkout. It takes 20% off a Sweat Test or Starter Kit on your first LEVELEN order, once per customer, through January 31, 2027.
Single Sport or Endurance?
Most runners only need Single Sport. Endurance kits include two tests for one athlete: bike and run, or the same sport in two different conditions, like a cool day and a hot day.
What's in a Starter Kit?
The full Sweat Test, your Individual Sweat Profile by email, and your first pouch of LEVELEN mix. The pouch ships after your results, so it matches your Level.
How long do results take?
Usually 1 to 2 weeks after the lab receives your sample. Your profile arrives by email with your Level and plan.
What's in the mix?
Sodium matched to your Level (900, 1,200 or 1,500 mg per liter), carried by dextrose. It comes in Strawberry-Citrus, Lemon-Lime and Neutral.
Is it right for everyone?
If you have high blood pressure or kidney issues, or take diuretics, check with your doctor before using an electrolyte mix.
Get your Level before race season
20% off a first Sweat Test or Starter Kit for the Keep The Pace Run Club. Free US shipping on every order.
Keep The Pace Run Club is a LEVELEN partner. Kyle Bergman coaches with Keep The Pace and is a LEVELEN growth partner. Testimonials reflect individual experiences. LEVELEN is an electrolyte mix and sweat-testing service, not a medical product.