Quick answer: A liter of cold water with a sodium-forward electrolyte mix — roughly 1,000 mg of sodium — replaces what a real session actually takes out. Plain water is fine for short sessions. Coconut water and sports drinks put the minerals in the wrong proportions. And the sauna beer is a tradition we won’t pretend to hate — just don’t ask it to do the rehydrating.
The last round ends, the heat lets go of you, and for the next half hour whatever you drink is doing the real work of the evening. Here’s the honest ranking — what each option actually contains versus what you actually lost.
First, what you lost: a typical hour in the heat pulls out half a liter to a liter and a half of sweat, carrying roughly 800–1,200 mg of sodium per liter, a few hundred milligrams of potassium, and a little magnesium (the full arithmetic is here). The right drink puts back fluid and salt in about those proportions.
The ranking
1. Cold water + a sauna electrolyte — the right tool
A liter of properly cold water with ~1,000 mg of sodium dissolved in it is, mineral for mineral, the closest match to what left you on the bench.
This is precisely what Suolaa is: a Finnish-style electrolyte made specifically for sauna use — 1,000 mg sodium, 200 mg potassium, 60 mg magnesium per stick, zero sugar, zero calories. One stick, one liter, after the last löyly. Not a drink. A ritual.
2. Plain water — fine for short sessions
One 15-minute round? Water is genuinely enough; your dinner will replace the modest sodium loss. Where plain water falls short is the long evening: drink back a liter and a half of sweat as pure water and you’ve restored volume while diluting sodium further — that’s the washed-out, faintly headachy feeling that sometimes follows a big session. Water is never wrong. It’s just incomplete after heavy sweating.
3. Sparkling mineral water — pleasant, mineral-light
The bubbles earn their place — cold carbonation after heat is one of life’s better small pleasures — but even mineral-rich waters carry far less sodium than sweat. Treat it as the second glass, not the replacement.
4. Coconut water — right idea, inverted ratio
Coconut water is potassium-heavy and sodium-light — roughly the opposite of sweat, which runs about five parts sodium to one potassium. It’s a fine drink; it’s just answering a question the sauna didn’t ask.
5. Sports drinks — sugar you didn’t order
A typical sports drink or sugar-based hydration mix (Gatorade, Liquid IV) pairs modest sodium with a solid dose of sugar — 11 grams and up. That design exists for mid-exercise fueling. After the sauna you don’t need the fuel, and the sodium still comes up short of what you lost.
6. The sauna beer — tradition, honestly filed
We’re not going to lecture. The post-sauna beer is older than most countries and, socially, it’s part of the point. Two honest notes, then peace: alcohol is a mild diuretic working against your rehydration, and beer’s sodium content is negligible. The Finnish move is to respect the sequence — water and salt first, then the beer as a pleasure rather than a plan. Rehydrate, then celebrate.
The short version
| Drink | Sodium vs. sweat | Verdict |
|---|---|---|
| Water + Suolaa | matches | The right tool |
| Plain water | none | Fine for short sessions |
| Sparkling water | trace | The second glass |
| Coconut water | low (potassium-heavy) | Wrong ratio |
| Sports drinks | moderate + 11g+ sugar | Built for mid-race |
| Beer | negligible + diuretic | After the water, with friends |
FAQ
What’s the best drink after a sauna? Cold water with a sodium-forward electrolyte mix — around 1,000 mg of sodium per liter, matching what sweat contains. Zero-sugar mixes fit best since there’s no mid-exercise fueling need.
Is beer after the sauna bad? As the only rehydration, yes — alcohol works against fluid recovery and supplies almost no sodium. After water and electrolytes, a beer with friends is tradition, and traditions count for something.
Is coconut water good after a sauna? It’s a pleasant drink but potassium-forward, while sweat is strongly sodium-forward. It doesn’t match the loss profile of heavy sweating.
How much should I drink after a sauna? Roughly what you sweated out — weigh yourself before and after; each kilogram down is about a liter to replace, ideally with sodium in it.
Suolaa — Finnish for salt. The sauna takes something. SUOLAA gives it back. Shop the Box of 30 →
This article is for general information and isn’t medical advice.