ZBiotics Pre-Alcohol shows no clear hangover benefit in small RCT

In a recent personal experiment, Nikola Jurkovic tested the efficacy of ZBiotics Pre-Alcohol, a genetically engineered probiotic marketed to reduce hangover symptoms. He hosted a party where 30 cups were prepared: 9 contained ZBiotics shots, 21 contained a placebo. Participants filled out an Acute Hangover Scale (AHS) the next day, yielding 28 valid responses. Using Opus 4.8 in Claude Code for analysis, Jurkovic found no statistically significant difference between groups. The ZBiotics group actually reported slightly worse average AHS scores (though better at the median), and the only variable clearly linked to hangover severity was the number of drinks consumed.

Jurkovic pre-registered his analysis plan and committed to publishing regardless of outcome. He acknowledges several limitations: the small sample size (N=28, only 9 in the treatment arm), potential issues with placebo blinding (most participants guessed their group correctly), and varying response times. He provides anonymized raw data for others to analyze. The study underscores the difficulty of proving supplement efficacy and the need for larger, more rigorous trials before consumers rely on such products for measurable health outcomes.