Lactate shuttle
How lactate is produced, transported and consumed between and within cells as a central metabolic intermediate.
Knowledge hub
The science of lactate metabolism
Lactate is increasingly understood as a central player in energy metabolism. This is an overview of the research areas that define the field.
Over the past decades, lactate has been reframed from a presumed waste product into a recognised energy substrate and signalling molecule. The research below is organised by theme, from foundational mechanisms to applied questions in performance.
Research areas
Themes in lactate science
Lactate as fuel
The role of lactate as an oxidisable energy substrate during exercise and at rest.
Lactate and endurance performance
Emerging research on how lactate availability may relate to endurance capacity and pacing.
Lactate and the brain
Lactate as a candidate energy source for the brain and its potential influence on central fatigue.
Lactate and fatigue
Re-examining the historical association between lactate and fatigue in light of current evidence.
Lactate and recovery
How lactate metabolism may interact with post-exercise recovery processes.
Lactate and glycogen
Lactate as a potential gluconeogenic and glycogenic substrate, and what this could mean for recovery.
Lactate and fat oxidation
The interplay between lactate, substrate selection and metabolic flexibility.
Editorial
All articles Featured articles
What athletes should know before using lactate-based fueling
Interested in lactate-based fuelling? Here is a grounded briefing on what the science currently supports, what it doesn't, and how to think about it.
Can lactate support glycogen recovery?
Lactate can be converted toward glucose and glycogen. Does that make it useful for recovery? The mechanism is real; the applied evidence is early.
Lactate, fat oxidation and metabolic flexibility
Lactate does not act in isolation. Its interaction with fat oxidation and substrate selection is central to understanding metabolic flexibility.
Bibliography
Full bibliography Featured papers
The Science and Translation of Lactate Shuttle Theory
- Main finding
- Synthesises decades of evidence positioning lactate as a central node of metabolism — a major carbon source, signalling molecule and gluconeogenic precursor — rather than a metabolic dead-end.
- Practical relevance
- Provides the theoretical foundation for viewing lactate as a usable energy substrate, underpinning interest in exogenous lactate.
- Limitations
- Narrative review; integrates heterogeneous evidence rather than reporting a single controlled experiment.
What the Lactate Shuttle Means for Sports Nutrition
- Main finding
- Argues that, given lactate's central metabolic role, exogenous lactate and lactate-based formulations are a plausible and under-explored avenue for sports nutrition.
- Practical relevance
- Directly motivates research into oral and exogenous lactate as a fuelling strategy for athletes.
- Limitations
- Conceptual review; calls for — rather than provides — controlled human performance trials.
Quantitative Fluxomics of Circulating Metabolites
- Main finding
- Using isotope tracing in mice, shows that lactate is one of the most rapidly circulating and exchanged metabolites, serving as a primary carbon source for the TCA cycle across many tissues.
- Practical relevance
- Provides mechanistic, quantitative support for lactate being a major systemic fuel rather than a by-product.
- Limitations
- Conducted in rodents; absolute flux values may differ in exercising humans.