CoreCtrl: How We Turned the Taurine Research Into a Product
By Alistair Brownlee — two-time Olympic gold medallist, Ironman Champion, co-founder of Truefuels
The Speed Read
CoreCtrl is built around 4g of taurine — the dose the research identifies as optimal. But taurine alone isn't the full story. We added piperine to improve absorption, a comprehensive electrolyte profile to replace what enhanced sweating takes out, and natural mint for perceptual cooling through a separate neural pathway. Four components. Four mechanisms. One formulation designed specifically for heat.
Why We Built CoreCtrl
After my last post on the taurine research, the question I kept coming back to was straightforward: if the science is this clear, why doesn't a product built specifically around it already exist?
Most sports nutrition either ignores heat entirely or addresses it with generic electrolyte drinks. CoreCtrl is a different category of product — designed from the ground up to address heat stress across multiple physiological pathways simultaneously.
Here's what went into it and why.
4g Taurine: The Foundation
The centrepiece is 4g of taurine — the dose that Li et al. (2025) identified as the optimal acute amount, and consistent with the loading protocols from Peel et al. (2024) and Page et al. (2019).
Not 1g. Not 6g. The research is clear that both under- and overdosing produce no significant effect. We use the dose the evidence points to.
Piperine: Making the Taurine Work Harder
Piperine is the active compound from black pepper. Its job is bioavailability — ensuring more of the taurine you ingest actually reaches your bloodstream.
It works through several mechanisms: stimulating gut amino acid transporters, inhibiting pumps that would otherwise remove compounds back out of intestinal cells, and slowing first-pass metabolism. It also increases intestinal membrane permeability. The result is meaningfully more of what you take actually getting absorbed.
We've included it because formulation integrity matters. A product with the right dose of taurine that isn't absorbed efficiently is a weaker product. We want the science to land.
Electrolytes: Replacing What Enhanced Sweating Takes Out
Taurine increases sweat output by 15–27%. That's the point — but it creates an obligation.
If you're sweating more, you're losing more sodium, potassium, magnesium, and chloride. As the Naddafha et al. (2026) review emphasised, taurine's thermoregulatory benefits work best when paired with adequate hydration and sodium replacement. Enhanced sweating without enhanced replacement is a fast route to hyponatraemia, cramping, and the very kind of collapse you're trying to avoid.
CoreCtrl includes a comprehensive electrolyte profile calibrated specifically for athletes exercising in hot conditions. This isn't an afterthought — it's a direct response to what the research says the formulation needs.
Natural Mint: Perceptual Cooling Through a Different Pathway
This one is worth explaining, because it's not marketing.
Menthol — the active compound in mint — activates TRPM8 cold-sensing ion channels in the oral cavity. It triggers a perceptual cooling response: you feel cooler without any change in actual core temperature. A meta-analysis in Scientific Reports found menthol significantly reduced thermal sensation during exercise with no compromise to actual heat-defence responses — it doesn't interfere with sweating or core temperature regulation.
The performance implication: you feel cooler, so you tolerate more and maintain output longer. An expert consensus statement prepared for the Tokyo Olympics classified menthol as ergogenic in hot environments.
The mechanism is behavioural rather than physiological. But the effect on performance is real — and it works through a completely separate pathway from the taurine. That's the logic: we're not stacking similar mechanisms, we're stacking complementary ones.
The Additive Logic
Each component addresses a different part of the heat problem:
- Taurine — amplifies the physiological cooling machinery: more sweat, from more glands, with greater evaporative efficiency
- Piperine — ensures the taurine is actually absorbed effectively
- Electrolytes — replaces what enhanced sweating takes out
- Mint — delivers perceptual cooling through an independent neural pathway
You're not relying on one mechanism. You're addressing heat stress from the sweat gland, the gut, the bloodstream, and the brain simultaneously.
How to Use It
Loading protocol (recommended): One sachet per day for 8 days before your target event. Athletes under approximately 60kg: two days on, one day off — to accumulate the correct dose over time.
Race day: Take your final sachet 1.5–2 hours before the start.
Hydration: Increase fluid intake by approximately 20% per hour. Add proportional salt. If you're a heavy sweater, err higher. Practise this in training before race day.
Caffeine: Based on current evidence, avoid combining caffeine and CoreCtrl in the same session for hot-weather racing. More research is needed on this interaction, but the conservative approach is to choose one or the other — or separate them by timing.
Safety: CoreCtrl is Informed Sport certified. Taurine is not on the WADA prohibited list. The doses used are consistent with the range that has been extensively tested in humans without adverse effects.
An Honest Note
I'm the co-founder of Truefuels and head of product. I've been transparent about that throughout this series, and I want to be direct here: CoreCtrl exists because I couldn't find a product that matched what the research pointed to. So we built it.
The science is real. The limitations are real — small studies, lab conditions, predominantly male samples. We're actively working with university partners to build a larger evidence base. I'll share those findings as they emerge.
If there's a chance your next event will be warm, the potential upside of CoreCtrl is significant and the downside risk is essentially zero. That's an honest assessment, not a sales line.
Go True.
References
Aggett J, Page J, et al. (2025). Acute Effects of Caffeine and Taurine Co-Ingestion on Time to Exhaustion and Thermoregulatory Responses to Cycling in the Heat. European Journal of Sport Science, 25(10), e70044.
Barwood MJ, et al. (2020). Menthol as an Ergogenic Aid for the Tokyo 2021 Olympic Games. Sports Medicine, 50, 1709–1727.
Córdova A, et al. (2020). Iron and Physical Activity: Bioavailability Enhancers, Properties of Black Pepper (Bioperine®). Nutrients, 12(6), 1886.
Garami A, et al. (2020). Menthol can be safely applied to improve thermal perception during physical exercise. Scientific Reports, 10, 13636.
Li X, et al. (2025). Dose-response relationship of taurine on endurance cycling performance under hot and humid conditions. Frontiers in Nutrition, 12, 1632131.
Naddafha S, Stout JR, Evans C. (2026). Taurine Supplementation and Human Heat Tolerance. Nutrients, 18(4), 592.
Page LK, et al. (2019). Acute taurine supplementation enhances thermoregulation and endurance cycling performance in the heat. European Journal of Sport Science, 19(8), 1101–1109.
Peel JS, et al. (2024). The effect of 8-day oral taurine supplementation on thermoregulation. European Journal of Applied Physiology, 124(9), 2561–2576.
Teixeira FJ, et al. (2022). Performance effects of internal pre- and per-cooling across different exercise and environmental conditions. Frontiers in Nutrition, 9, 959516.
