EVIDENCE LIBRARY
Did a Ketone Supplement Lower Alcohol Levels Without Proving Better Driving?
A ten-person crossover trial found lower breath and reported blood alcohol levels after a ketone drink. It did not demonstrate restored driving ability or faster elimination, and several subjective outcomes were unchanged.
A small crossover trial found lower breath and reported blood alcohol levels after a ketone supplement, but did not test driving or establish faster alcohol elimination. Several measures of feeling intoxicated were unchanged. These results cannot establish a supplement as a way to become fit to drive.
What the human experiment compared
Li and colleagues studied ten healthy adults, seven men and three women, who completed both conditions. Participants received a ketone drink at one visit and a placebo at another, in randomized, counterbalanced order. The study was single blind.
After a standardized meal, participants received the assigned drink and then a low alcohol dose. Breath measurements, laboratory-reported blood alcohol levels and subjective ratings were collected over the following three hours.
The drinks differed in composition: the ketone formulation contained ketones and allulose, while the placebo contained sugar, and their calories were not matched. The comparison therefore did not isolate ketones from every other difference between the drinks.
Lower concentrations were a measured result
Breath alcohol was significantly lower in the ketone condition, including lower peak readings. Laboratory-reported blood alcohol levels were also lower overall, with a significant peak difference among participants with paired data.
These were two measurement streams, rather than blood levels calculated solely from breath. However, the human methods do not clearly identify the laboratory specimen as whole blood versus serum or plasma. The results should not be relabeled as forensic whole-blood BAC without that information.
Some blood draws were missing. Values below the laboratory’s 10-milligram-per-deciliter reporting cutoff were analyzed as five milligrams per deciliter. That substituted value was an analysis convention, not a measured concentration of five.
The trial did not show faster elimination
An exploratory comparison of elimination rates was not significant, p = .2. Lower concentrations after an oral dose can arise from altered absorption as well as altered metabolism.
The researchers discussed possible mechanisms, including slower gastric emptying and changes in metabolic cofactors. Those explanations were not directly established here. The study cannot provide a reliable correction factor for reconstructing a driver’s earlier concentration after supplement use.
Subjective effects were mixed
The ketone condition produced lower liking and greater disliking of alcohol. The apparent reduction in wanting more alcohol did not remain significant after adjustment for ratings taken before alcohol administration.
Ratings of feeling alcohol’s effects, feeling high, stimulation, sedation and alcohol urge did not show significant intervention effects. Thus, the paper’s broad language about dampened responses needs to be read alongside its null outcomes.
No reaction-time, divided-attention, driving-simulator or on-road outcome established improved functional performance. Lower average concentrations in this selected experiment do not certify an individual’s ability at a later time.
Rat findings and tolerability do not remove the limits
A separate eight-rat experiment compared the ketone formulation with allulose and water. Ketones lowered rat blood alcohol more than the other conditions. This helped investigate the sweetener explanation in rats; it was not a human allulose-only control and cannot settle every human mechanism.
Most human participants correctly identified their drink, limiting blinding. The sample was small and the alcohol exposure low. Gastrointestinal effects and low glucose readings also occurred, with study staff monitoring and managing them. The trial therefore does not establish unrestricted safety.
For DUI interpretation, concentration, subjective experience and functional performance remain separate questions. The site’s hospital alcohol measurement analysis explains why the specimen and reporting method must also be identified before comparing alcohol numbers.
Primary source
Li X and colleagues. Ketone Supplementation Dampens Subjective and Objective Responses to Alcohol: Evidence From a Preclinical Rat Study and a Randomized, Cross-Over Trial in Healthy Volunteers. International Journal of Neuropsychopharmacology. 2024;27:pyae009. https://doi.org/10.1093/ijnp/pyae009.