When conditions get serious, hydration gaps show up fast. Tatiana Marinho is a nutritionist and endurance athlete who knows exactly where they appear. Her race day protocol calls for 1,000mg of sodium per hour in heat and humidity. Here's the race that put BSc Hydrate to the test.
"25km. 1,529m of Elevation. Zero Cramps."
Some races are forgiving. The Kunanyi Mountain Run is not one of them.
25 kilometres. 1,529 metres of elevation gain. Twelve kilometres straight up, followed by a steep technical downhill. These are the perfect conditions for cramps that end races or where your hydration strategies will either hold up or fall apart.
Tatiana Marinho hadn't done hill training this year, and she pushed hard anyway.
Meet Tatiana Marinho
Endurance Athlete. Nutritionist. BSc Science Advisory Board Member.
Tatiana isn't just an athlete who uses BSc products. She's someone who tests them in conditions most people would consider unreasonable.
When she tests a product, she tests it by racing up a mountain. Her feedback isn't anecdotal. It's informed by both lived experience under serious physical demand and a professional understanding of what the body actually needs to perform.
"Steep downhill is where you usually get into trouble with cramps. I was pushing pretty hard at the end."
What She Was Up Against
The Kunanyi Mountain Run is built around conditions that expose gaps in your hydration plan.
Sustained climbing for the first half. A steep, technical descent where muscles are already fatigued and nerve-to-muscle signalling is under pressure. Heat and humidity accelerate sweat loss faster than most athletes plan for.
Tatiana hadn't done specific hill preparation leading into the race. She knew the descent would be the moment of truth. It's exactly where cramps tend to show up, and exactly where being under-hydrated or low on sodium becomes a real problem.
Here’s Exactly How She Used BSc Hydrate on Race Day
Tatiana's approach was straightforward and deliberately timed around where sweat loss accumulates.
- 1 scoop at 1.5 hours into racing.
- 1 scoop at the final 10km.
As a nutritionist, Tatiana's standard recommendation is 1,000mg of sodium per hour in hot and humid conditions.
One serving of BSc Hydrate delivers exactly that, matching her own race day protocol precisely.
Steep downhill. Full effort. No cramps.
Why Sodium Is the Electrolyte That Matters Most in Endurance Events
This is where the science behind the result sits.
Sweat losses are predominantly sodium. Lose enough of it, and the consequences are specific: fluid balance collapses, nerve-to-muscle signalling breaks down, and cramps follow.
This is why simply drinking water during a long event isn't always enough. Water replaces fluid. It doesn't replace the sodium that tells your muscles how to fire.
BSc Hydrate delivers 1,000mg of sodium per serve, alongside 500mg of potassium and 150mg of magnesium, matching the protocol Tatiana herself recommends for hot and humid racing conditions.
The formula isn't built around making hydration taste good and calling it done. It's built around what actually needs to be replaced when the conditions are serious.
Built for Athletes. Backed by Science. Tested on a Mountain
There's a difference between a product that's been formulated in theory and one that's been used by a nutritionist racing 25km up and down a mountain.
BSc Hydrate 3X Electrolytes is both.
Replenish. Rehydrate. Perform.
