Ketone drinks do next to nothing for recovery

Exogenous ketone supplements have gained attention as a potential strategy to enhance post-exercise recovery, and they occupy an expensive corner of the sports nutrition market. The pitch is that drinking ketones after training could ease soreness, restock muscle fuel and settle the biomarkers of muscle damage faster than recovery nutrition alone. Individual trials have come and gone without a clear verdict, so the practical question for anyone eyeing these products is simple: when all the trial evidence is gathered and pooled, do exogenous ketones actually improve any measurable aspect of recovery?

The reviewers searched PubMed, Embase and Web of Science for randomised controlled and crossover trials investigating exogenous ketone supplementation around exercise. Sixteen studies met the inclusion criteria, and seven provided data suitable for meta-analysis. Outcomes covered the core recovery territory: muscle soreness, muscle glycogen resynthesis, post-exercise lactate concentrations, creatine kinase as a marker of muscle damage, subsequent physical performance, and cognitive recovery measures such as reaction time. Effects were pooled using standardised and mean differences with confidence intervals, and consistency across studies was assessed throughout.

The pooled analyses showed no significant effect on muscle soreness and no significant effect on muscle glycogen resynthesis. A small effect on post-exercise lactate actually favoured the control condition, a difference of 0.34 mmol/L, though the authors judge its clinical relevance limited. Creatine kinase, the muscle-damage marker, was not significantly affected. No consistent improvements appeared across physical recovery outcomes. Cognitive recovery evidence was mixed, with isolated improvements in reaction time while most cognitive outcomes remained unaffected. Taken together, the review found limited benefit of exogenous ketones for post-exercise recovery on essentially every front it examined.

This pooling tempers the enthusiasm that has built around ketone esters and salts as recovery aids, and it does so across multiple outcomes rather than a single measure. The authors note that the evidence base is largely restricted to physically active male adults, which limits how far the conclusions stretch to women, older adults or untrained people. They call for further well-powered studies in more diverse populations and recovery contexts. Until those arrive, the weight of randomised evidence sits clearly on the side of no meaningful recovery benefit.

If recovery is the reason you have been considering ketone supplements, this review gives you very little to work with: soreness, glycogen replenishment, muscle-damage markers and physical performance all failed to improve, and the one statistically significant finding, on lactate, pointed the wrong way and was judged of limited relevance anyway. The occasional reaction-time improvement is thin ground for an expensive habit. The honest open question is whether different populations or contexts might respond differently, since nearly all participants were active men, but nothing here suggests the average lifter or runner is missing out.