You step off the mat or out of the sauna soaked through, skin flushed, maybe a little lightheaded — and you reach for water. Plain water cools the thirst, but it can leave you feeling flat, because a hard heat sweat drains more than fluid. If you do regular heat therapy, electrolytes for sauna and hot yoga sessions are worth understanding, because what you lose in that room isn't quite what a gym workout costs you.
Why a heat-therapy sweat is its own thing
In a hot sauna or a 90-minute heated yoga class, your body sweats to shed heat, not to power hard muscular work. Fluid losses add up fast: a single Bikram yoga class has been shown to drive meaningful body-mass loss from sweat, with the sodium in that sweat needing deliberate replacement afterward to restore fluid balance (Salt and water balance after sweat loss: a study of Bikram yoga). Sauna sessions land in the same territory — a typical sitting can cost half a liter to well over a liter of sweat.
Sweat isn't just water. It carries sodium — roughly 460 to 1,840 mg per liter, varying widely from person to person — plus smaller amounts of potassium, magnesium, calcium, and chloride. Replace the water but not the sodium and you dilute what's left in your bloodstream, which is why chugging plain water after a long, sweaty session can leave you puffy-headed rather than restored.
Here's the part most hydration advice gets wrong
Search "sauna hydration" or "electrolytes for hot yoga" and much of the advice is quietly copied from marathon fueling — including the push to take in carbohydrates or sugar. That's the one piece that doesn't transfer. On a long run you burn through stored fuel and genuinely need 30–90 g of carbohydrate an hour to keep going. On a sauna bench or a yoga mat, you're barely touching those fuel stores. You're losing heat and fluid, not calories worth chasing.
So the sugar in a sports-style drink does nothing useful here — and if you're doing heat work partly to feel light afterward, a syrupy drink works against that. What the moment actually calls for is fluid plus the minerals that sweat carried out, and nothing you don't need.
The electrolytes that matter after heat
Sodium is the one to lead with. It's the principal electrolyte governing how much of the fluid you drink your body actually holds onto. Sodium supports fluid absorption and retention through sodium-coupled transport in the gut — the same mechanism behind oral rehydration therapy — and a beverage carrying sodium is retained better than plain water over the hours after you drink it (Maughan et al., Am J Clin Nutr 2016, beverage hydration index).
Magnesium supports normal neuromuscular function, and it's a mineral many people run low on before they ever set foot in a hot room. Electrolytes support normal nerve signaling and muscle contraction generally — which is what you're leaning on to hold a long balance pose or sit out a full cycle. Potassium and calcium round out the fluid-balance picture alongside sodium.
How burbo fits the sauna bench and the yoga mat
burbo was built for exactly this kind of need — replacing what a sweat takes without adding what it doesn't. One 6.0 g stick delivers 327 mg of sodium, which sits right in the range for helping your body hold the fluid you drink after a heavy sweat, without going overboard. It also brings 200 mg potassium, 50 mg calcium, and 100 mg of magnesium as magnesium bisglycinate — making it an excellent source of magnesium at 24% of the Daily Value, in a gentle, well-absorbed form.
And it leaves out what a heat session doesn't call for: burbo is calorie free, with no sugar load. It's sweetened with OnoSweet, a zero-calorie form of Reb M, plus a trace of organic agave for flavor rounding — no carbohydrate to chase, and no sugar alcohols like erythritol or sorbitol, which are a common and overlooked cause of the bloat people often blame on their drink. Every batch is third-party tested for heavy metals, so you know what's in the stick you're mixing.
How much, and when
Mix one stick into a full bottle of water — more sticks always means more water, never a stronger concentrate. A practical rhythm:
- Before: one stick in the 30–60 minutes ahead of a long, hot session, so you start topped up rather than chasing losses.
- During or right after: one stick per hour of continued heavy sweating to match what's going out.
- Heavy, salty sweater in real heat: two sticks across the first hour is reasonable, then settle to one per hour.
Two sticks a day is comfortably fine and three is the practical daily ceiling; if a long heat block asks for more sodium than that, take the extra from food or a plain, vitamin-free electrolyte rather than stacking more sticks. The ceiling exists because burbo's vitamins are dosed to daily targets — a sign the formula is built with intent, not an afterthought.
The takeaway
Heat therapy is one of the cleanest cases for an electrolyte drink: you sweat hard, you burn almost no fuel, and you want to come out feeling light rather than loaded. Reach for fluid plus the minerals your sweat carried off — sodium first, magnesium close behind — and skip the sugar you don't need. A single stick in a full bottle, before or after your session, covers it.
These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. How this article was researched and written: our editorial standards.