Individualized electrolytes

Know your Level.

Sharon Schmidt-Mongrain running the Ironman World Championship finish in a LEVELEN kit

Sharon Schmidt-MongrainLevel 5’25 & ’26 AG Ironman World Champion · Ironman All-World, USAT All-American Rank #1

Sodium loss varies a lot from one athlete to the next. A mail-in sweat test measures yours and assigns your Level: 3, 4 or 5. Then you fuel on the mix made for it.Sodium loss varies a lot. Test yours and fuel to your Level.

Check your sodium Get the Sweat Test from $129

Free Sodium Check, about a minuteLab results typically in 1 to 2 weeks

Free Sodium Check, about a minute · Results typically 1 to 2 wks

2,400+athletes have tested with the home kit

20+ yrsof sweat research behind every Level

~1,500 mgsodium the median endurance athlete loses per hour

1 to 2 wkstypical time from mailing your sample to your Level

Founded by Sandra Fowkes Godek, PhD, ATC and Arthur Bartolozzi, MDAnalyzed in the HEAT Sport Sciences lab

How it works

Test. Get your Level.
Fuel.

One normal workout with a patch on. The lab reads your sweat, then your mix ships at your Level.

Take the sweat test
Wear the patch through one normal training session and mail it back postage-paid. No clinic, no change to your routine.
Single sport from $129
Get your Level
The lab measures the sodium in your sweat and assigns your Level. It is set by how salty your sweat runs, not by how hard you train.
Results in 1 to 2 weeks
Fuel to it
Drink the mix built for your Level, carried by glucose for absorption. Your sweat rate sets how much you drink.
$75 a pouch · 20 servings (Neutral 27)

LEVELENIndividual Sweat Profile · Sample

Your Level4

Sport: Triathlon (Run)
Matched mix: 1,200 mg/L sodium
Per 14 oz serving: 500 mg sodium
Sweat rate, this session: 0.83 L/hr
Plan per hour: 2 servings

Sample report with illustrative values. Your report shows your own measured results.

Shop by Level

Pick your Level

Every flavor comes in Levels 3, 4 and 5. Only the electrolyte content changes. Below Level 3, a standard sports drink likely covers you. Free US shipping on $150+.

Level3

Mix900 mg/L

Per serving370 mg sodium

Flavors3 flavors

Pouch$75

Servings20 (Neutral 27)

Shop Level 3

Level4

Mix1,200 mg/L

Per serving500 mg sodium

Flavors3 flavors

Pouch$75

Servings20 (Neutral 27)

Shop Level 4

Level5

Mix1,500 mg/L

Per serving620 mg sodium

Flavors3 flavors

Pouch$75

Servings20 (Neutral 27)

Shop Level 5

Don't know yours?

Take the free Sodium Check to see how far off your sodium is, then get your Level measured with the Sweat Test.

Check your sodium Or get it measured

Starter Kit

Sweat Test + your first pouch

Test once. Your first pouch ships at the Level the lab assigns.

Endurance Sweat Test$199

First pouch at your Level$75

Bought separately~~$274~~

Starter Kit · you save $25$249

Get the Starter Kit

Sharon Schmidt-Mongrain finishing a race with her child

Level 5

Athlete story

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 5

Trains on Level 5 Strawberry-Citrus.

Sharon's experience. Individual results vary.

Check your sodium

In their words

What tested athletes say

Ironman, Kona and CrossFit athletes on testing and fueling to their Level.

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 4

The 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