LEVELEN™ Athlete Sweat Test Kit
Endurance / MultiSport
$199.00
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LEVELEN™ Athlete Sweat Test Kit
Stop guessing your sodium. Measure it from your own workout sweat, then fuel with a mix matched to your Level.
$199.00
Your quiz estimate
1. Choose your test
Endurance / MultiSport
Two patches: bike and run, or one sport in two conditions
Single Sport
One patch for the sport you train most
2. Choose your kit
Sweat Test only
Add your mix after your results
$199
Starter Kit Recommended
Test + your first pouch, matched to your results
$249
$199 test + $75 pouch = $274. Starter Kit $249, save $25.
Your kit
Includes electrolyte mix
Required. It helps us match your results to how you actually train.
- Results typically in 1 to 2 weeks
- Prepaid return mailer (US)
- Free US shipping on $150+
Not sure you need a test? Take the free Sodium Check, about a minute.
Why test
The typical endurance athlete loses about 1,500 mg of sodium an hour
That is about seven salt capsules every hour. Many athletes take one or two. Sodium loss varies a lot from one athlete to the next, so the only way to know your number is to measure it.
Median sodium loss across more than 4,000 endurance-athlete sweat tests run by LEVELEN since 2016. A typical salt capsule carries about 200 mg of sodium.
~1,500mg sodium lost per hour
Lost per hourabout 7 capsules
Often taken1 or 2
How it works
How the Sweat Test works
No clinic visit and no special session. You test during training you were going to do anyway.
- Order
Your kit ships
Sweat patch, collection vial, tweezers, prep pads, instructions and a prepaid return mailer (US).
- Test day
Train 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 session
Mail it back
Move the gauze into the vial with the tweezers and send it back in the prepaid mailer.
- Typically 1 to 2 weeks
Get your profile
Your Individual Sweat Profile arrives by email with your Level and plan. Starter Kits then ship your first pouch at that Level.
Who analyzes your sweat
The lab of Dr. Sandra Fowkes Godek, PhD, ATC
LEVELEN co-founder and a career researcher in thermoregulation and athlete sweat testing, with research conducted with the Philadelphia Eagles (NFL) and Philadelphia Flyers (NHL). The test uses LEVELEN's patented method (US Patent 9,421,226).
What's in the box
Everything you need for one clean sample
| Included | Single Sport | Endurance |
|---|---|---|
| Sweat patch | 1 | 2 |
| Collection vial, tweezers, prep pads | Yes | Yes |
| Prepaid return mailer (US) | Yes | Yes |
| Individual Sweat Profile by email | 1 session | 2 sessions |
| Support by email, phone or video chat | Yes | Yes |
| First pouch of matched mix | Starter Kit | Starter Kit |
Endurance kits are for one athlete: bike and run, or the same sport in two different conditions.
What you get back
Your sweat, in numbers
- Sweat rate in liters per hour for each session tested
- Sodium and chloride concentration and loss per hour, and where you rank among tested athletes
- How much to drink per hour in similar conditions
- Your LEVELEN Level and a race-day hydration plan
LEVELENIndividual Sweat Profile · Sample
| Measure | Bike | Run |
|---|---|---|
| Sweat rate | 1.0 L/hr | 1.6 L/hr |
| Sodium concentration | 950 mg/L | 1,400 mg/L |
| Sodium loss | 950 mg/hr | 2,240 mg/hr |
| Drink per hour | 21 to 25 oz | 36 to 41 oz |
Your LEVELEN Level51,500 mg/L mix
Sample report with illustrative values. Your report shows your own measured results.
Our method
Real workout sweat
You collect your sample while you train, at your usual intensity and in your usual conditions. That is the sweat your drink has to replace, so that is the sweat we measure.
Some sweat tests make you sweat at rest using a chemical applied to the skin, a method that comes from medical screening. We measure sweat produced by exercise instead.
Endurance kits test two sessions, because the same athlete can sweat differently on the bike and on the run.
How it compares
Guessing vs measuring
Typical values. Sports drinks and salt capsules vary by product.
| Feature | Guessing | Typical sports drink | Salt capsules | LEVELEN Sweat Test + mix |
|---|---|---|---|---|
| Based on your own sweat | No | No | No | Yes, measured in your training |
| Sodium | Unknown | About 80 to 450 mg per liter | About 200 mg per capsule | 900, 1,200 or 1,500 mg per liter, set by your result |
| Chloride | Unknown | Varies | Varies | Included |
| Carbohydrate to help absorption | Unknown | Usually | None | Dextrose in every scoop |
| Bike and run tested separately | No | No | No | Yes, with the Endurance kit |
In their words
Tested athletes
Through a recent Sweat Test in Kona, we were able to tweak my fuel plan to best my 2009 time by 40 minutes and pick off all but one of the ladies in front of me.
Sharon Schmidt-Mongrain’25 & ’26 AG Ironman World Champion · Ironman All-World, USAT All-American Rank #1
Level 5The sweat test kit is very simple and straightforward, and the results were clear. The LEVELEN team is all about the science and the fine-tuned needs of athletes.
Brady DeHoust24× Ironman · 8× Kona Qualifier
I incorporated LEVELEN 4 into my long distance training plan and the results have been great. For the first time, ‘the wall’ never came.
Brad SemleIronman Triathlete · ’11 Kona Finisher
Level 4FAQ
Questions before you test
Not sure you need a test yet? Take the free Sodium Check, about a minute.
How long does the whole thing take?
You wear the patch for 30 to 60 minutes of a normal session. Your results are emailed, typically within 1 to 2 weeks after the lab receives your sample.
Which kit should I choose?
Choose Single Sport if you train mostly one sport. Choose Endurance / MultiSport if you are a triathlete or want to test one sport in two different conditions; it includes two patches for one athlete. A Starter Kit adds your first pouch at your measured Level for $50 more.
I'm a triathlete. What should I test?
Use the Endurance / MultiSport kit and test one bike session and one run session. Sweat can differ between the bike and the run, and your profile reports both.
How often should I retest?
Once a year at the start of your season. Test more often if you train and race in very different climates, because adapting to heat changes how you sweat.
I already did a sweat test somewhere else. Should I test again?
Our test measures sweat collected during your own training session and maps it directly to a LEVELEN Level. If your earlier test collected sweat another way, such as at rest, testing with us gives you a number from exercise sweat.
When does the Starter Kit pouch ship?
After your results come back, so it ships at the Level your test measures. You choose Strawberry-Citrus, Lemon-Lime or Neutral.
What about shipping?
Free US shipping on orders of $150 or more, which includes both Starter Kits. The return mailer for your sample is prepaid for US orders.