Cramps don't come from lactic acid.
They come from electrolyte failure.
The science of why muscles cramp during exercise — and exactly what to do about it.
Informed Sport certified ·
Built by Alistair Brownlee ·
4.86★ (200+ reviews)
Products & Bundles
Start with a bundle or build your own stack. Bundles save you vs buying separately.
Electrolytes
400mg sodium · 150mg potassium · 25mg magnesium
CoreCtrl™
4,000mg taurine · 300mg potassium · 60mg magnesium
Energy Gels
40g carbs · 0.25/1g salt · hot weather · heavy sweaters
Race Ready System
40 Energy Gels · 40 Electrolyte Sachets · 8 CoreCtrl Sachets
"Cramping at Kona on the run is a race-ender. We built the CoreCtrl formula specifically to prevent what I'd experienced in competition."
— Alistair Brownlee, 2x Olympic Champion, truefuels co-founder
Alistair built truefuels because no existing product met the demands of elite triathlon — heat, duration, GI stress all at once. Tested by Alistair and 50+ elite athletes.
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Frequently Asked Questions
Current research (Peel 2024) points to altered neuromuscular control from electrolyte depletion — specifically sodium, potassium and taurine. Lactic acid theory largely replaced.
Yes — Peel (2024) showed 4,000mg taurine reduced exercise-induced cramping in a controlled trial. This is the exact dosage in CoreCtrl sachets.
Sustained sodium/potassium loss over 3+ hours + insufficient electrolyte replacement + neuromuscular fatigue in final 10km. Calf most common site due to sustained eccentric load.
1 sachet per hour cool conditions, 1–2 per hour warm/hot. Use the calculator.
Electrolytes replace what sweat takes away (foundation). CoreCtrl adds the taurine mechanism that specifically reduces exercise-induced cramping. Serious cramp-prone athletes should use both.
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