Research

Research on exogenous lactate

An overview of the evidence base on exogenous lactate and lactate metabolism — organised by study type, with a curated bibliography and open research opportunities.

Featured

Featured research

Review Review Lactate shuttle Metabolism Fuel

The Science and Translation of Lactate Shuttle Theory

Brooks, G. A. · Cell Metabolism · 2018

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.

DOI: 10.1016/j.cmet.2018.03.008 →

Review Review Fuel Sports nutrition Metabolism

What the Lactate Shuttle Means for Sports Nutrition

Brooks, G. A. · Nutrients · 2021

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.

Human studies

Evidence in humans

Controlled human trials — mostly acute — examining oral and exogenous lactate. The body of work is small and findings are preliminary.

Human study Human Performance Oral lactate Acid-base balance

Effects of Oral Lactate Supplementation on Acid–Base Balance and Prolonged High-Intensity Interval Cycling Performance

Bordoli, C. et al. · [Journal placeholder — verify] · 2023

Main finding: Investigated whether acute oral lactate supplementation alters acid–base balance and performance during prolonged high-intensity interval cycling in trained participants.
Practical relevance: One of the more directly applied human trials of oral lactate as an ergogenic aid for interval-based endurance work.
Limitations: Small sample typical of acute crossover designs; findings require replication across populations and protocols.

Human study Human Performance Oral lactate Metabolism

The Influence of Acute Oral Lactate Supplementation on Responses to Cycle Ergometer Exercise

Ewell, M. et al. · [Journal placeholder — verify] · 2022

Main finding: Examined acute physiological and metabolic responses to oral lactate supplementation during cycle ergometer exercise.
Practical relevance: Adds to the small but growing body of controlled human work characterising how ingested lactate behaves during exercise.
Limitations: Acute design; does not address chronic supplementation or trained-athlete competition settings.

Human study Human Metabolism Appetite Gastric emptying

Oral Lactate Slows Gastric Emptying and Suppresses Appetite in Young Males

Pedersen, H. et al. · [Journal placeholder — verify] · 2021

Main finding: Reported that oral lactate ingestion slowed gastric emptying and reduced subjective appetite in young male participants.
Practical relevance: Relevant to gut tolerance, fuelling strategy and the formulation of lactate-based products for endurance settings.
Limitations: Specific population (young males); gastrointestinal and appetite effects may interact with exercise feeding strategies in ways not yet characterised.

Mechanistic

Animal and mechanistic studies

Animal models and mechanistic work that establish how lactate behaves as a circulating fuel and metabolic intermediate.

Animal model Animal Metabolism Fuel Lactate shuttle

Quantitative Fluxomics of Circulating Metabolites

Hui, S. et al. · Cell Metabolism · 2020

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.

DOI: 10.1016/j.cmet.2020.09.013 →

Theory

Reviews and theoretical frameworks

Reviews and conceptual frameworks — including lactate shuttle theory — that organise the evidence and motivate new research.

Review Review Lactate shuttle Metabolism Fuel

The Science and Translation of Lactate Shuttle Theory

Brooks, G. A. · Cell Metabolism · 2018

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.

DOI: 10.1016/j.cmet.2018.03.008 →

Review Review Fuel Sports nutrition Metabolism

What the Lactate Shuttle Means for Sports Nutrition

Brooks, G. A. · Nutrients · 2021

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.

Ongoing research

ExoLactate supports and tracks ongoing investigation into exogenous lactate, including questions of dosing, tolerance, endurance fuelling and recovery. Current research opportunities are listed on the participate page.

Methodology

Studies indexed here are summarised for their main finding, practical relevance and limitations. The bibliography is curated for relevance to exogenous lactate and lactate metabolism, and is not a systematic review. Bibliographic details should be verified against the original sources, and the evidence base should be read as emerging rather than settled.