For decades, lactate was endurance sport's designated villain, the thing coaches blamed for the burn, the reason athletes trained to “clear” it faster. That model has been wrong for a long time, and the 2026 Tour de France has turned the correction into a mainstream story. Reports from the race describe riders on at least one WorldTour team trialling a new gel built around exogenous lactate, lactate you eat, rather than lactate your muscles produce under load. The product, called ExoLactate, was developed by Aitor Viribay, a former lead physiologist at Ineos Grenadiers now working in performance at Salomon, after roughly seven years of research and development.
The pitch is straightforward: if lactate is a genuine fuel rather than a metabolic dead end, why not supply it directly, without paying the cost of producing it through hard glycolytic effort? It's a compelling idea, and it's dividing opinion inside the sport. Some of that divide is simply hype getting ahead of a genuinely interesting mechanism. Some of it is warranted skepticism about a product with impressive theory and thin performance data. Both things can be true at once, and separating them is the point of this piece.
The physiology isn't new, the delivery is
The idea that lactate is fuel rather than waste rests on the lactate shuttle hypothesis, developed by Dr. George Brooks at UC Berkeley and considered settled, well-established exercise physiology at this point. Muscle, heart, and brain tissue can all oxidise lactate directly for energy, and lactate also functions as a signalling molecule that influences how the body adapts to training. The “lactic acid causes the burn and needs to be flushed” model taught in gym classes for years was already outdated science before any gel entered the conversation.
What's new isn't the physiology, it's the delivery. Feeding meaningful amounts of lactate to an athlete without triggering gastrointestinal distress has been the practical bottleneck. Earlier attempts at oral lactate supplementation struggled to deliver useful doses in a form athletes could actually stomach mid-race. ExoLactate's proprietary formulation reportedly allows riders to tolerate 15–25 grams of lactate per hour with markedly less GI disruption than earlier formulations, alongside 40 grams of carbohydrate in a 1:1 glucose-to-fructose ratio, packaged like a standard race gel. Riders using it are reportedly noting lower perceived effort and better fatigue resistance, but it's worth being precise about what that is: rider-reported impression from a live race, not a controlled outcome.
What the published research actually shows
This is the part that's easy to lose in the Tour de France coverage: the human performance evidence for exogenous lactate is thin, and what exists is genuinely mixed.
A 2024 randomised, double-blind, crossover pilot trial (Ewell et al., published in Nutrients) gave trained cyclists an oral calcium-and-magnesium lactate supplement and found no change in VO2peak, lactate threshold, or ventilatory threshold. It did find a 4% increase in average work rate during a 20-minute cycling time trial, with no accompanying change in heart rate or perceived exertion, a modest but real signal in a small pilot study.
A separate 2024 trial in trained endurance cyclists used a considerably higher dose, around 120 mg/kg of body weight of calcium lactate, roughly 8 grams for a 70 kg rider, across repeated 1km and 4km time trials. That study found no time-trial benefit at all, despite measurably raising blood bicarbonate and lowering riders' perceived exertion. In other words, the supplement changed the internal chemistry and how hard the effort felt, without translating into a faster result on the clock.
A 2025 study out of the University of Tokyo (Seike, Takahashi and Hatta) gave healthy subjects around 1,100 mg of oral lactate and measured energy metabolism at rest and during exercise. It confirmed that ingested lactate is metabolically active, the body does use it, but again stopped short of demonstrating a performance breakthrough.
Put together, the most consistent finding across this small body of research is that exogenous lactate behaves like a mild acid-base buffer: it can lower how hard an effort feels and shift blood chemistry, similar in character to sodium bicarbonate loading, without reliably making athletes faster. That's a meaningfully different evidence base from carbohydrate fuelling protocols (dozens of trials supporting 90–120g/hour) or dietary nitrate (an IOC-recognised ergogenic aid with a substantial trial base). Lactate supplementation currently sits well below that evidence bar, promising mechanism, minimal proof.
Why the Tour de France is a useful headline, but not a proper test
It's worth noting the obvious limitation here: a single unnamed WorldTour team trialling a product mid-Tour isn't a controlled study, and it isn't really meant to be one. Grand Tour stages involve extreme heat, multi-week fatigue accumulation, altitude, and huge variance in effort profile, conditions where it's genuinely hard to isolate what's driving a good or bad day. It's understandable that speculation has followed the story, with fans and media guessing at which riders might be using it, and at least one nutrition sponsor has stepped in to clarify that its athlete wasn't among them. It's a good reminder that an interesting physiological question can quickly get ahead of itself once it's linked to a specific result.
The manufacturer's own framing is refreshingly honest about where things stand: this is a first-generation product built on sound underlying biology, being field-tested by elite athletes ahead of any peer-reviewed performance trial in a race setting. That's a reasonable R&D pathway. It's also exactly why the current evidence can't yet support strong performance claims either way.
What this means for the rest of us
For working with athletes or thinking about fuelling strategy more broadly, a few things are worth holding onto. Lactate genuinely is fuel, that part of the science isn't in question and hasn't been for years. Whether ingesting extra lactate on top of what the body already produces adds meaningfully to performance is a separate, unresolved question, and the honest answer right now is: probably a mild buffering effect for some athletes, no effect for others, and no evidence yet of a reliable time gain. The product is food-grade and not on any prohibited list, since lactate is a substance the body produces naturally, but dose-dependent GI distress is a real and reported risk, which means, as with any new race fuel, it has no business being trialled for the first time on race day.
The more useful frame is that lactate gels are a frontier worth watching rather than a reason to rewrite a fuelling plan today. The fundamentals with decades of trial data behind them, adequate carbohydrate delivery, sodium and hydration matched to sweat rate, and well-established buffering or oxygen-efficiency aids, remain the higher-confidence marginal gains. Lactate supplementation may earn its place alongside them. It hasn't yet.
