Taurine: The Secret Weapon for Conquering Heat in Endurance Sports?

I bet you've already been there; maybe you were running on a hot day, cycling indoors or in a warm gym. Gradually, without you realising, the effort became harder. If you were wearing a heart rate monitor, it would show a heart rate much higher than you expected for that level of intensity. Maybe you completed the session, or maybe you had to stop before the end. Either way, as soon as you stopped, you felt how hot your skin was, and even a bit dizzy. And, over the next hour, you're hit by a wall of thirst.

Heat is a silent killer of performance. As I said in a previous blog, it's silent because we spend a lifetime learning where the boundaries of our other physiological limits are. But, for most of us, not where our heat limits are. Even if you've nailed your training plan, optimised your fuelling, and dialled in your pacing — when the mercury rises, everything can fall apart as I know all too well! Core temperature spikes, sweat pours, and suddenly, your body hits the brakes. It's not a lack of will; it's physiology fighting back.

I wrote in my last two posts about the brutal reality of heat, how it shut me down in Beijing and hospitalised me in London, and how acclimation protocols have transformed my approach to hot-weather racing. But acclimation takes time: weeks of structured heat exposure, sauna sessions, and careful periodisation. What if you could accelerate part of that process? What if there were a way to prime your body's cooling system before the starting gun even fires?

Enter taurine.

Not a new pre-workout ingredient. Not another overhyped supplement. Taurine is an amino acid your body already relies on, and a growing body of rigorous research suggests it can meaningfully enhance your ability to manage heat. I've spent years reading the latest published work on human physiology and nutrition, and this work genuinely excites me. Backed by studies from 2019 to 2026, the evidence is genuinely compelling. But as with anything in science, the devil is in the detail.

What Is Taurine, and Why Does It Matter in Muscle?

Taurine is one of the most abundant free amino acids in human skeletal muscle, typically present at high concentrations in muscle far exceeding its plasma levels (Kurtz et al., 2021). It's not there by accident.

Crucially, taurine isn't evenly distributed. Research from Tallon et al. (2007) in Biogerontology, alongside earlier work by Stuerenburg & Kunze (1990), shows that taurine is preferentially concentrated in Type I (slow-twitch, oxidative) muscle fibres, our endurance workhorses that keep you going hour after hour. This makes intuitive sense: taurine plays key roles in mitochondrial function, calcium handling, and antioxidant protection, all of which are more critical during sustained aerobic work.

Here's the twist. During exercise, taurine gets mobilised and depleted from muscle tissue. Matsuzaki et al. (2002) found that this depletion is actually most pronounced in fast-twitch dominant muscles despite their lower baseline concentrations. For a triathlete, this dual relevance across fibre types is particularly interesting: you rely on slow-twitch fibres for most of the race, but you also recruit fast-twitch fibres for the first 200m of the swim, trying to make that bike pack, and that finish-line sprint. Taurine matters across the board.

The Landmark Study: 8 Days to Better Cooling

The study that really caught my attention was Peel et al. (2024), published in the European Journal of Applied Physiology. It's the most comprehensive investigation of taurine and thermoregulation to date, and the numbers are striking.

Fifteen non-heat-acclimatised adults took 50 mg/kg/day of taurine (roughly 3–4g for most people) for 8 days in a double-blind, placebo-controlled crossover design. On day 8, they exercised at a fixed heat production (~200 W/m²) in 37.5°C conditions, with humidity progressively ramped up until their thermoregulatory system could no longer cope — the so-called "critical vapour pressure" (P_crit), the point at which heat gain outstrips heat loss and core temperature begins its inexorable climb.

The results:

• Whole-body sweat loss: +26.6% (p=0.035)
• Local sweat rate: +15.5% (p=0.013)
• Active sweat glands recruited: +22–32% (p<0.001 for 1×1 cm area)
• Evaporative heat loss: +27% (p=0.010; Cohen's d = 0.79)
• Net heat storage: −72% (p=0.024; Cohen's d = −0.87)
• Critical vapour pressure: +3.3 mmHg (p=0.002; d = 0.97)

In plain terms, taurine dramatically amplified the body's cooling machinery. More sweat, from more glands, evaporating more effectively. The result? Heat storage, the rate at which your body accumulates thermal energy it can't shed, was slashed by nearly three-quarters. And the critical threshold at which the system became overwhelmed was pushed significantly higher. That could be the margin between coping and cooking, winning or losing.

One important nuance: Peel et al. did not find a significant reduction in absolute core temperature. The thermoregulatory benefit was expressed differently, as a delay in the onset of uncompensable heat stress, rather than a lower core temp per se. The benefits were also most pronounced during the fixed-humidity phase and tapered as humidity climbed into extreme ranges. This tells us something honest about the limits: taurine helps enormously, but it can't overrule the laws of physics when the air is simply too saturated for sweat to evaporate.

I think performing in a hot endurance event is essentially a battle to stay below your P_crit. Go over it for too long, and heat is accumulating in your body faster than you can shed it; your core temp climbs. You're only coming back if you reverse this and go under P_crit for long enough, which would require either sitting in a fridge or massively lowering intensity so your internal heat production drops. I find it helpful to think of it as a heat-based threshold in the same way as we view our physiological thresholds.

Acute Dosing: A Single Shot Before You Race

The Peel study used 8 days of loading. But what about a single dose? Page et al. (2019), published in the European Journal of Sport Science, tested exactly that: 50 mg/kg of taurine taken 2 hours before cycling to exhaustion in 35°C, 40% relative humidity.

Eleven male cyclists rode at their ventilatory threshold — hard, but sustainable. The taurine group lasted 25.16 minutes versus 22.43 minutes for placebo, a 10% improvement in time to exhaustion (p=0.040). Local sweat rate at end-exercise was 12.7% higher (p=0.034). And in the final 10% of the ride, when it really counts, core temperature was 0.4°C lower (38.1°C vs. 38.5°C; p=0.049). Blood lactate was also 16.5% lower post-exercise (p=0.033).

That 0.4°C might not sound like much, but in the context of competitive endurance sport, it's enormous. When you're operating in the narrow band between 39°C and 40.5°C, where cardiovascular strain accelerates, and the body approaches a critical thermal limit beyond which fatigue sets in regardless of motivation (González-Alonso et al., 2008), even a few tenths of a degree can mean the difference between holding pace and falling apart.

The Dose-Response question: Is there a sweet spot?

If some is good, is more better? Li et al. (2025), published in Frontiers in Nutrition, tackled this head-on with a dose-response design. Sixteen male participants cycled to exhaustion in hot, humid conditions (35°C, 65% relative humidity — significantly more humid than the Page study) after taking either placebo, 1g, 4g, or 6g of taurine one hour before exercise.

The 4g dose was the clear winner: time to exhaustion increased by 12.4% compared to placebo, with significantly higher sweat rates and lower core temperatures from the 9-minute mark onward. Neither 1g nor 6g produced significant effects.

This is a U-shaped dose-response curve; too little doesn't reach the physiological threshold for effect, and too much appears to hit diminishing returns, possibly through intestinal transporter saturation or osmotic effects that counteract the thermoregulatory benefit. The practical implication is clear: 4g appears to be the sweet spot for acute pre-race dosing.

The humid conditions here (65% RH) are worth noting. This is closer to the kind of oppressive, muggy heat you'd encounter racing Kona, Singapore, or a spring/summer marathon, where evaporative cooling is already severely compromised. Taurine's ability to enhance sweat gland output and push the critical threshold higher is arguably more valuable in exactly these conditions.

Synthesising the Evidence

Naddafha et al. (2026), writing in Nutrients, pulled the threads together in a comprehensive narrative review. Synthesising the human trials, they highlight taurine's potential to improve heat tolerance through multiple pathways: earlier sweat onset, higher sweat production, modestly lower core temperatures (~0.3–0.4°C), and better exercise capacity in the heat.

One of the review's most striking claims is that short-term taurine supplementation may achieve on the order of 50–80% of the sweating improvement that a traditional heat acclimation programme would yield, at least in the initial phase of exercise. That's a remarkable shortcut, though the authors are careful to note that it's not a replacement for proper acclimation, which sustains high sweat rates throughout prolonged stress in a way that taurine alone doesn’t.

They also flag important interactions. Taurine works best when paired with adequate hydration and sodium. If you're cranking up sweat output by 26%, you'd better be replacing that fluid and those electrolytes. And there's a critical caveat around caffeine: Aggett & Page et al. (2025), in the European Journal of Sport Science, found that combining caffeine (5 mg/kg) with taurine (50 mg/kg) negated the thermoregulatory benefit entirely. No improvement in time to exhaustion, no difference in core temperature, no change in sweat rate. Caffeine's thermogenic and metabolic-stimulating effects appear to offset taurine's cooling advantage. This is a core element of truefuels' philosophy: the simpler we can make the product, the better. Combining ingredients can have many unintended consequences.

For athletes who rely on caffeine as a performance aid, which is most of us, this is a significant finding. It may mean choosing one or the other for hot-weather racing, or at least being strategic about timing. This is an area that clearly needs more research, but for now, the practical advice would be to be cautious about stacking caffeine and taurine together.

How Does It Actually Work? The Mechanisms

Skip this bit if you don’t care about mechanistic assumptions; if you’re interested in human physiology, read on! Several mechanisms are proposed, with varying degrees of evidence:

Enhanced eccrine sweat gland responsiveness is the primary driver. This is the mechanism with the most direct support from human data. Taurine appears to increase both the number of active sweat glands (Peel et al., 2024: +22–32%) and the output per gland (Page et al., 2019: +12.7% local sweat rate). At the molecular level, it may upregulate aquaporin-5 (AQP5) water channels on sweat gland cells, increasing the flux of water into sweat — though this is based on animal data and hasn't been confirmed directly in humans (Li et al., 2025).

Central neuromodulation is another pathway. Taurine crosses the blood-brain barrier and acts on the hypothalamus, the brain's thermoregulatory control centre, via glycine and GABA receptors. This may lower the core temperature threshold at which sweating is initiated, effectively turning the thermostat down (Frosini et al., 2003). The earlier onset of sweating observed in the human studies is consistent with this hypothesis.

Osmolyte and plasma volume effects may also contribute. When absorbed, taurine increases plasma osmolarity, potentially drawing water into the vascular compartment and providing a larger fluid reservoir for sweating. Peel et al. (2024) noted that despite substantially greater sweat losses with taurine, plasma volume at trial end was not significantly more depleted, suggesting some compensatory plasma maintenance.

Broader metabolic effects round out the picture. Taurine plays roles in mitochondrial function, calcium handling, and energy metabolism. There is growing evidence that it may promote greater fat oxidation during exercise, which may help spare muscle glycogen, support mitochondrial protein synthesis and respiratory chain function. More on all of this in the next blog. These effects are unlikely to reduce metabolic heat production directly, but they may contribute to sustained performance through mechanisms that sit alongside the thermoregulatory benefits.

What isn't driving the benefit, interestingly, is skin blood flow. Peel et al. (2024) found no significant difference in cutaneous blood flow between taurine and placebo conditions. The benefit is almost entirely about sweating, not vasodilation.

Who Stands to Gain the Most?

Based on the current evidence, several groups may benefit disproportionately:

Heat-naive athletes: those training in cool climates but racing in hot conditions are perhaps the most obvious beneficiaries. Full heat acclimation takes 10–14 days of structured exposure to ramp up sweat rate and plasma volume. Taurine offers a way to prime some of those thermoregulatory responses before you've had time to acclimate properly. Peel et al. (2024) deliberately used non-acclimatised participants, and the improvements were dramatic. For someone coming out of a British winter to race a spring marathon in warm conditions, this could be genuinely meaningful.

Athletes racing in high humidity may also see particular benefit. Li et al. (2025) tested in 65% humidity, conditions where evaporative cooling is already severely compromised, and still found significant improvements with 4g taurine. When the air can barely accept more moisture, every additional sweat gland you can recruit and every increment in sweat output matters more.

Low sweaters (those producing under ~1 L/hour) might gain from the sweat gland recruitment effect — Peel's 22–32% increase in active glands could unlock significant untapped cooling capacity.

High sweaters (2+ L/hour) might benefit from the sustained output, provided they replace the additional fluid and sodium.

A practical first step: measure your own sweat rate. Weigh yourself pre- and post-session (nude, towelled dry), account for fluid intake, and divide by exercise duration. It's crude but informative, and helps you understand where taurine's benefits might apply to your physiology.

An Honest Assessment: What We Don't Know

I've laid out the positive case, but intellectual honesty demands acknowledging the limitations, and they're real.

The entire human evidence base for taurine and thermoregulation rests on two or three primary trials (Page 2019, Peel 2024, Li 2025), each with small sample sizes of 11–16 participants. All were conducted in laboratories, not in real races. The participants were predominantly young, healthy, non-acclimatised males with moderate fitness levels (V̇O₂max ~46–50 mL/kg/min) — not elite athletes operating at 70+ mL/kg/min. We simply don't know whether the benefits translate to highly trained, already-acclimatised individuals in field conditions. But, to contextualise this, there might not be a lot of evidence, but the evidence that exists is strong compared to many other nutrition-based performance aids.

There is limited data in women specifically (Peel 2024 included just 3 of 15 female participants). Given that women have different sweating characteristics and thermoregulatory responses, this is a significant gap. And as I mentioned, the caffeine interaction (Aggett & Page et al., 2025) raises important practical questions. Taurine in cold conditions also shows no benefit (Theis et al., 2021), confirming that the mechanism requires heat to activate, which makes physiological sense but limits the use case.

It's worth noting that none of the studies we've discussed has reported adverse effects from taurine at these doses, and the safety profile is well established. So if you're checking the weather forecast for an event in the next few weeks and there's a chance it could be warm, CoreCtrl is a sensible insurance policy; the potential upside is significant, and the downside risk is essentially zero.

How can I boost my performance in the heat?

Based on the best available evidence:

Short-term loading: 50 mg/kg/day (~3–4g for most athletes) for 7–8 days before a target race or heat block. This follows the Peel et al. (2024) protocol and may produce stronger and more consistent effects than acute dosing alone. This is 1 sachet of CoreCtrl for 8 days before your event. We recommend 2 days on, one day off for athletes who weigh under approximately 60kg to make sure they accumulate the correct dose over time. Does longer-term loading provide even more benefit? Probably yes, although the literature has yet to show this, and there is no harm in doing 16 or 24 days. My anecdotal experience is that there are longer-term benefits, but they start to plateau.

Acute pre-race: 4g taurine, taken 1.5–2 hours before your event. This aligns with both Page et al. (2019) and the optimal dose identified by Li et al. (2025). Take your last sachet of CoreCtrl the morning of the event.

Hydration adjustment: If taurine increases your sweat output by 15–27%, your fluid and sodium needs go up accordingly. Don't let enhanced cooling capacity outrun your hydration strategy. As a starting point, drink an extra 20% of fluid per hour, and add the same proportion of salt to your intake. Make sure you practise this beforehand. The truefuels Electro has 1g of salt per serve — taking an extra portion per hour of activity is probably sensible for most. If you're a heavy and salty sweater, try 2 per hour. Using me as an (extreme!) example, I can sweat at 3L/hour with a sodium concentration of around 2g/L, which equates to roughly 5g of salt per litre,  meaning 15g of salt loss per hour. A 20% increase on that would be 3g of additional salt.

Caffeine timing: Consider separating caffeine and taurine, or choosing one over the other for hot-weather racing, until more data emerge on their interaction.

Safety: Taurine has a strong safety profile. It's not an exotic compound — your body produces it endogenously, and it's one of the most abundant amino acids in your tissues. A systematic risk assessment of all published human clinical trials (Shao & Hathcock, 2008) found no pattern of adverse effects at any dose tested, establishing a confident safe level of 3g/day for long-term supplementation. Doses of up to 6g/day have been used in clinical trials lasting up to a year without adverse effects, and acute doses of up to 10g have been tested safely. The EFSA (2009) independently reviewed the toxicological and human data and concluded that taurine consumption was not a safety concern. For context, the doses used in the thermoregulation studies we've discussed — 3–4g/day — sit comfortably within the range that has been extensively tested in humans. Taurine is not on the WADA prohibited list, and CoreCtrl is Informed Sport certified.

Why We Built CoreCtrl: Stacking the Deck Against Heat

This is where the science meets the product, and where I should be transparent about my involvement. truefuels is my start-up nutrition brand, and I am head of product. CoreCtrl is our attempt to take everything I've just described and put it into a single, practical formulation designed specifically for athletes facing heat.

The centrepiece is 4g of taurine, the dose that Li et al. (2025) identified as the sweet spot, and consistent with the loading protocols used by Peel et al. (2024) and Page et al. (2019). But taurine alone is only part of the story. We wanted to create something that addressed heat stress from multiple angles simultaneously, because that's how the body actually works; it doesn't thermoregulate through one pathway alone.

Piperine: Enhancing Absorption and Bioavailability

CoreCtrl includes piperine, the active alkaloid from black pepper, as a bioavailability enhancer. The evidence for piperine's ability to boost nutrient absorption is well-established across a range of compounds. It works through several complementary mechanisms: stimulating gut amino acid transporters, inhibiting pumps that would otherwise shuttle compounds back out of intestinal cells, and inhibiting enzymes that contribute to first-pass metabolism (Kesarwani & Gupta, 2013). It also increases intestinal membrane permeability by modifying the lipid dynamics of the brush border membrane (Córdova et al., 2020).

The headline numbers are striking: piperine has been shown to increase the bioavailability of various co-administered compounds by 30–200%, and in the case of curcumin, by up to 2,000% (Shoba et al., 1998). The mechanism essentially widens the absorption window and keeps more of what you ingest from being broken down before it reaches the bloodstream. In our anecdotal experience, athletes using CoreCtrl report that the effects feel amplified compared to taurine alone, and we're currently working on academic research to investigate this more rigorously. Watch this space.

Electrolytes: Supporting the Sweat Equation

If taurine is cranking up your sweat output by 15–27%, which the evidence strongly suggests, then you need to replace what you're losing. That's not just water; it's sodium, potassium, magnesium, and chloride. CoreCtrl includes a comprehensive electrolyte profile designed specifically for athletes exercising and living in hot conditions.

This isn't an afterthought. As Naddafha et al. (2026) emphasised in their review, taurine's thermoregulatory benefits work best when paired with adequate hydration and sodium replacement. Enhanced sweating without enhanced replacement is a recipe for hyponatraemia, cramping, and the very kind of performance collapse you're trying to avoid. The electrolyte blend in CoreCtrl is calibrated to match the elevated losses that come with taurine-enhanced cooling.

Cooling Flavour and Natural Mint: Perceptual Cooling That Works

The third pillar is something you notice the moment you drink it: a cooling flavour profile built around natural mint. This isn't just about making it taste refreshing; there's genuine science behind why this matters.

Menthol, the active compound in mint, activates TRPM8 cold-sensing ion channels in the oral cavity, triggering a perceptual cooling response; you feel cooler without any change in actual core temperature (Garami et al., 2020). A meta-analysis of randomised controlled trials in Scientific Reports found that menthol significantly cooled thermal sensation and tended to improve thermal comfort during exercise, with no compromise to warmth-defence responses, meaning it doesn't interfere with sweating, heart rate, or core temperature regulation (Garami et al., 2020).

The performance implications are real. A systematic review by Teixeira et al. (2022) in Frontiers in Nutrition found that menthol mouth rinsing improved physical performance during exercise in the heat. And an expert consensus statement for the Tokyo Olympics (Barwood et al., 2020, Sports Medicine) classified menthol as ergogenic in hot environments. The mechanism is behavioural rather than physiological: you feel cooler, so you tolerate more, push harder, and maintain output longer.

The Additive Logic

What excites me about CoreCtrl is how these components complement each other across different pathways. Taurine enhances the physiological cooling machinery: more sweat, from more glands, with greater evaporative efficiency. Piperine helps ensure that taurine gets absorbed effectively. The electrolyte profile replaces what the enhanced sweating takes out. And mint provides perceptual cooling on top of the physiological improvements, working through an entirely separate 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. In our anecdotal experience working with athletes, this multi-pathway approach amplifies the effect of taurine and makes the whole formulation more effective than any single ingredient alone. We're doing rigorous work with a university partner to quantify this properly, and I'll share those findings as soon as we have them.

Why am I so excited about CoreCtrl?

For three reasons: firstly, because our mission at truefuels is to help active people be their best and heat is a major barrier to this; secondly, because this is genuinely a new class of sports nutrition, there is nothing like it on the market, and it's based on cutting-edge science; and thirdly, because I've tried it myself and know it works.

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. https://doi.org/10.1002/ejsc.70044

Barwood MJ, Gibson OR, Gillis DJ, Jeffries O, Morris NB, Pearce J, Ross ML, Stevens C, Rinaldi K, Kounalakis SN, Riera F, Mündel T, Waldron M, Best R. (2020). Menthol as an Ergogenic Aid for the Tokyo 2021 Olympic Games: An Expert-Led Consensus Statement Using the Modified Delphi Method. Sports Medicine, 50, 1709–1727. https://doi.org/10.1007/s40279-020-01313-9

Córdova A, Fernández-Lázaro D, Mielgo-Ayuso J, Seco-Calvo J. (2020). Iron and Physical Activity: Bioavailability Enhancers, Properties of Black Pepper (Bioperine®) and Potential Applications. Nutrients, 12(6), 1886. https://doi.org/10.3390/nu12061886

EFSA Panel on Food Additives and Nutrient Sources added to Food (ANS). (2009). The use of taurine and D-glucurono-gamma-lactone as constituents of the so-called "energy" drinks. EFSA Journal, 7(2), 935. https://doi.org/10.2903/j.efsa.2009.935

Frosini M, et al. (2003). A specific taurine recognition site in the rabbit brain is responsible for taurine effects on thermoregulation. British Journal of Pharmacology, 139(3), 487–494. https://doi.org/10.1038/sj.bjp.0705274

Garami A, Rumbus Z, Solymár M, et al. (2020). Menthol can be safely applied to improve thermal perception during physical exercise: a meta-analysis of randomised controlled trials. Scientific Reports, 10, 13636. https://doi.org/10.1038/s41598-020-70499-9

González-Alonso J, et al. (2008). The cardiovascular challenge of exercising in the heat. Journal of Physiology, 586(1), 45–53. https://doi.org/10.1113/jphysiol.2007.142158

Kesarwani K, Gupta R. (2013). Bioavailability enhancers of herbal origin: An overview. Asian Pacific Journal of Tropical Biomedicine, 3(4), 253–266. https://doi.org/10.1016/S2221-1691(13)60060-X

Kurtz JA, et al. (2021). Taurine in sports and exercise. Journal of the International Society of Sports Nutrition, 18(1), 39. https://doi.org/10.1186/s12970-021-00438-0

Li X, Huo L, Wang L, Zhang W. (2025). Dose-response relationship of taurine on endurance cycling performance under hot and humid conditions. Frontiers in Nutrition, 12, 1632131. https://doi.org/10.3389/fnut.2025.1632131

Matsuzaki Y, et al. (2002). Decreased taurine concentration in skeletal muscles after exercise for various durations. Medicine & Science in Sports & Exercise, 34(5), 793–797. https://pubmed.ncbi.nlm.nih.gov/11984297/

Naddafha S, Stout JR, Evans C. (2026). Taurine Supplementation and Human Heat Tolerance: Mechanisms, Evidence, and Integration with Heat Acclimation, Cooling, and Hydration. Nutrients, 18(4), 592. https://doi.org/10.3390/nu18040592

Page LK, Jeffries O, Waldron M. (2019). Acute taurine supplementation enhances thermoregulation and endurance cycling performance in the heat. European Journal of Sport Science, 19(8), 1101–1109. https://doi.org/10.1080/17461391.2019.1578417

Peel JS, McNarry MA, Heffernan SM, et al. (2024). The effect of 8-day oral taurine supplementation on thermoregulation during low-intensity exercise at fixed heat production in hot conditions of incremental humidity. European Journal of Applied Physiology, 124(9), 2561–2576. https://doi.org/10.1007/s00421-024-05478-3

Peel JS, et al. (2021). The effect of dietary supplements on endurance exercise performance and core temperature in hot environments: A meta-analysis and meta-regression. Sports Medicine, 51(11), 2351–2371. https://doi.org/10.1007/s40279-021-01500-2

Shoba G, Joy D, Joseph T, et al. (1998). Influence of piperine on the pharmacokinetics of curcumin in animals and human volunteers. Planta Medica, 64(4), 353–356. https://doi.org/10.1055/s-2006-957450

Simmonds MJ, et al. (2022). Physiological and thermoregulatory effects of oral taurine supplementation on exercise tolerance during forced convective cooling. European Journal of Sport Science, 22(2), 209–217. https://doi.org/10.1080/17461391.2020.1858175

Stuerenburg HJ, Kunze K. (1990). Taurine concentrations in muscles and corresponding types of muscle fibres. Amino Acids, 1(2), 221–226.

Tallon MJ, Harris RC, Maffulli N, Tarnopolsky MA. (2007). Carnosine, taurine and enzyme activities of human skeletal muscle fibres from elderly subjects with osteoarthritis and young moderately active subjects. Biogerontology, 8(2), 129–137. https://doi.org/10.1007/s10522-006-9038-6

Teixeira FJ, Brito P, Roriz M, Brito J, Teixeira V. (2022). Performance effects of internal pre- and per-cooling across different exercise and environmental conditions: A systematic review. Frontiers in Nutrition, 9, 959516. https://doi.org/10.3389/fnut.2022.959516

8-Day Loading: After 8 days of taurine supplementation (50 mg/kg/day), participants showed significant improvements across every thermoregulatory measure. The standout finding was a 72% reduction in net heat storage during the compensable phase of exercise—the period where the body is still successfully working to balance heat loss against heat production.

In this window, the taurine group accumulated internal heat at less than a third of the rate seen with placebo. By significantly slowing this "heat soak," taurine effectively extends the runway, delaying the point at which the athlete hits uncompensable heat stress. These results, from a double-blind crossover study of 15 participants at 37.5°C, also included a 15.5% increase in local sweat rate, a 26.6% increase in whole-body sweat loss, and a 17–32% boost in active sweat gland recruitment. Adapted from Peel et al. (2024).

Acute Single Dose. A single dose of taurine (50 mg/kg) taken two hours before cycling in 35°C heat extended time to exhaustion by 12.2%, from 22.4 to 25.2 minutes. In the final 10% of the ride, when it matters most, core temperature was 0.4°C lower, and blood lactate was 16.5% lower in the taurine group. This was the first direct human evidence that a single acute dose of taurine can improve both thermoregulation and endurance performance in the heat. Adapted from Page et al. (2019).

Dose-Response: Sixteen participants cycled to exhaustion in 35°C and 65% relative humidity after taking a placebo, 1g, 4g, or 6g of taurine, revealing a clear U-shaped dose-response curve. Only the 4g dose produced a significant effect: a 12.4% increase in time to exhaustion compared to placebo (p = 0.031), with neither 1g nor 6g reaching significance. This identifies 4g as the optimal acute dose — below that, the physiological threshold isn't reached, and above it, diminishing returns set in. Adapted from Li et al. (2025).

Heat loss model: This illustrative model shows how CoreCtrl shifts the thermoregulatory response during prolonged exercise in the heat. In panel B, evaporative heat loss ramps up earlier and reaches a higher plateau with CoreCtrl, reflecting the increased sweat gland activation and sweat rate found by Peel et al. (2024), which in turn keeps core temperature on a lower trajectory throughout exercise (panel A), consistent with the 0.4°C reduction observed by Page et al. (2019) in the final stages of cycling to exhaustion. The widening gap between the two curves illustrates why even modest improvements in cooling capacity compound over time: the standard condition drifts toward the critical zone (~39.5°C) where fatigue accelerates, while CoreCtrl keeps the athlete operating with more thermal headroom. Illustrative model adapted from Peel et al. (2024) and Page et al. (2019); not raw experimental data.