WITHINComing soon
@within__id

Redefining Your Hydration Routine. Soon

The stuff your body actually loses when you sweat, in a single sachet. No sugar, no additives, no artificial stuff. Made in Indonesia.

UNDER 8 INGREDIENTS·NO ADDITIVES·1000MG SODIUM·NO SUGAR ADDED·MADE IN INDONESIA·BUILT FOR THE HEAT·UNDER 8 INGREDIENTS·NO ADDITIVES·1000MG SODIUM·NO SUGAR ADDED·MADE IN INDONESIA·BUILT FOR THE HEAT·UNDER 8 INGREDIENTS·NO ADDITIVES·1000MG SODIUM·NO SUGAR ADDED·MADE IN INDONESIA·BUILT FOR THE HEAT·
What's Within

Three minerals in. The rest, left out.

One sachet. Only the minerals your body sweats out, at the dose it loses them. Nothing added to pad the label.

WITHIN electrolyte sachet
Why WITHIN

Built for the heat and humidity.

Train in Indonesia's heat and your sweat can't evaporate fast enough to cool you, so your body just makes more of it. Every drop carries minerals out with it, mostly sodium, some potassium. Tropical sweat isn't saltier. You just lose far more of it.

01Not just water

Water puts the fluid back but not the minerals that left with it.

02The three that matter

Sodium holds it, Potassium moves it, and Magnesium helps regulate muscle contractions.

03Dosed to your loss

1000mg sodium + 250mg potassium. Enough to replace an hour of hard sweat, not a pinch for taste.

Lost per hour of training
Sodium900to1,250mg
04008001,2001,600 MG
Potassium125to200mg
0100200300400 MG

Sweat loss measured in runners at ~30°C / 70% humidity. Surapongchai et al., Nutrients (2021).

Side by side

How WITHIN compares.

Hydration is fluid plus minerals. Most of what's sold gets the minerals wrong: too little, or buried under sugar.

WITHIN
Sports drink
Water
Replaces fluid
mix with 500ml water
Sodium, dosed to loss
1000mg
~245mg per bottle
0mg
Potassium + magnesium
250mg + 50mg
100mg, no magnesium
No added sugar
zero
~31g per bottle
No colors, flavors, sweeteners
The formula

Under 8 ingredients.
Nothing hidden.

Just what your sweat takes out, in the amounts it takes. Every gram printed on the front of the pack.

Sodium chloride
Sodium chloride

The mineral you lose most when you sweat. Holds water in the body instead of letting it run straight through.

Potassium chloride
Potassium chloride

Works with sodium to pull water into your cells and keep muscles steady.

Magnesium carbonate
Magnesium carbonate

Backs energy production and helps muscles settle after a hard session.

Natural flavoring
Natural flavoring

Flavor from real fruit. Nothing synthetic.

Natural sweetener
Natural sweetener

Stevia leaf. No sugar, no calories, no crash.

What's not in it
No artificial colors
No artificial flavors
No artificial sweeteners
No sugar added
The idea

Somewhere along the line, hydration got complicated. More sugar, more dye, more claims on the label than minerals in the drink. We went the other way. The minerals you lose, at the dose you lose them, and nothing to read past.

Made in Indonesia, for the way people train here. We'll launch the moment our approvals clear.

Frequently asked questions

Each sachet has 1000mg sodium, 250mg potassium and 50mg magnesium. Under 8 ingredients, no additives, no added sugar.