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THE SCIENCE
What's in the sachet, and why.
Tap a number on the sachet to see what each ingredient does.
1 · SODIUM · Na⁺ · SALT (NaCl)
750 mg
The one you sweat out most.
Sodium is the main electrolyte in sweat, and the one you lose most of. It keeps water in your bloodstream, and it drives the sodium–potassium pump in every nerve and muscle cell: each cycle spends one ATP to push three sodium ions out and pull two potassium ions in. That charge difference is what lets a nerve fire and a muscle contract.
750 mg in 500 ml ≈ 65 mmol of sodium per litre
GO DEEPER
The science, in more detail.
A · SODIUM, POTASSIUM AND ATP
Three out, two in: the pump in every cell.
Every nerve and muscle cell runs a sodium–potassium pump. Each cycle spends one molecule of ATP, your cells' energy currency, to push three sodium ions out and pull two potassium ions in. The charge difference that builds up across the cell wall is what lets a nerve fire and a muscle contract.
Both minerals matter, but sweat drains the sodium side several times faster than the potassium side. So GESOUT is weighted the same way: 750 mg sodium to 250 mg potassium, three to one.
B · MAGNESIUM
Why only 33 mg of magnesium?
Because you hardly sweat it out. A litre of sweat can carry close to a gram of sodium, but only a tiny fraction of that in magnesium. And most of your magnesium sits in reserve in bone and muscle, so a hard session doesn't drain it the way it drains sodium.
A big dose wouldn't help either: large amounts of magnesium tend to upset the stomach, the last thing you want mid-race. That is also why GESOUT uses magnesium bisglycinate, magnesium bound to the amino acid glycine, a form known for being easy on the gut. And the small amount still earns its place: the form of ATP your cells actually spend is Mg-ATP.
C · DEXTROSE
Why there's dextrose in the mix.
Dextrose is simply glucose, and it is the first ingredient on the label for a reason. The lining of your small intestine is studded with a transporter called SGLT1, the sodium–glucose co-transporter. It only carries glucose in when it brings sodium with it: two sodium ions for every glucose molecule.
Where sodium and glucose go, water follows by osmosis. So a little glucose helps pull sodium, and the water you drank, into your body. Each sachet carries about two sodium ions for every glucose molecule, matching the transporter. At this dose it adds only a hint of sweetness; most of the sweetness comes from a touch of sucralose.
Per 7,8 g sachet: 3,1 g carbohydrate, of which 2,8 g sugar. 53 kJ. Made in South Africa.