The hangover supplement market is worth roughly $1.8 to $2.8 billion and growing fast, and dihydromyricetin (DHM) has become its star ingredient - the flavonoid compound found in Hovenia dulcis, the Japanese/Chinese raisin tree, and the active ingredient in most "scientifically-backed" hangover products on the market today.
One thing prompted us to dig deeper than usual here: a marketing page makes a very specific, very confident claim - that a 2024 clinical trial in the journal Foods "proves DHM cuts hangover severity by 70% (p<0.001)." That's an unusually precise number for a category an independent academic review just called "very low quality evidence." So we went and read the actual study.
The 70% Number Does Not Exist in the Study Being Cited
We located and read the full text of the actual 2024 paper (Lee et al., Foods, DOI: 10.3390/foods13244021) that the "70% reduction" claim is attributed to. The number is not in it. Not the headline figure, not in any table, not in the discussion. Here is what the study actually found.
"70% Hangover Reduction, p<0.001"
Presented as the strongest clinical evidence yet for DHM, citing "UCLA and USC research" and describing the study as using "25 healthy adults" with results "across all primary outcome measures."
1 of 9 Symptoms Significant - Not From DHM Alone
25 participants, Korean research team (Korea University and Kwangdong Pharmaceutical), testing Hovenia combined with either kudzu root or glutathione yeast extract - not isolated DHM. Total hangover score: not significant (p=0.32). Eight of nine individual symptoms: not significant. Only gastrointestinal discomfort reached significance (p<0.05), and only in the Hovenia+kudzu group.
To be precise about what this study is and isn't: it's a real, properly randomized, double-blind, placebo-controlled, peer-reviewed trial - the methodology itself is sound. The institutions are Korea University and a Korean medical research center, not UCLA or USC. Several study authors are employees of Kwangdong Pharmaceutical, the company that supplied the extracts, which is disclosed in the paper's own conflict-of-interest statement. None of that makes the study fraudulent. It does mean the "70% reduction" figure attributed to it is simply not something this paper supports, by any reading of its actual results tables.
An independent 2022 systematic review of 21 placebo-controlled hangover trials, covering a wide range of products, concluded there is currently only "very low quality evidence" supporting any hangover treatment or prevention product on the market. This is the category-level finding from researchers with no product to sell - not a hit piece on one ingredient, but the honest baseline you should bring to any hangover supplement marketing claim, DHM or otherwise.
What About NAC? It Has Better Logic, Same Result
N-acetylcysteine is mechanistically one of the more plausible hangover compounds: it's a direct precursor to glutathione, the antioxidant your liver depletes while processing alcohol's toxic byproduct, acetaldehyde. The theory is clean and the biochemistry checks out on paper. A 2024 randomized, double-blind, placebo-controlled study tested exactly this - and found NAC produced no significant difference from placebo on hangover severity scores, despite measuring real biochemical changes in the process.
NAC (N-Acetylcysteine)
2024 RCT in 40 students found no significant effect on hangover severity scores (AHSS) versus placebo, despite NAC's sound glutathione-precursor mechanism. A separate, smaller 49-person crossover study using low-dose NAC (600-1800mg) also failed to show clear benefit.
Hovenia dulcis / DHM Combinations
The 2024 Foods study found a significant reduction in one of nine symptoms (GI discomfort), only in the Hovenia+kudzu combination group. Earlier smaller crossover trials (Kim et al. 2017) reported broader hangover symptom improvement in a specific subgroup (heterozygous ALDH2 genotype) - a genetically narrower finding than general marketing suggests.
Electrolytes & Hydration
Alcohol is a diuretic and dehydration is a measurable, real contributor to hangover symptoms - this part of the mechanism is not contested. Dedicated RCTs isolating electrolyte repletion specifically as a hangover treatment are surprisingly sparse, but the underlying physiological rationale is more solid than for most "hangover cure" ingredients.
Everything Else (Milk Thistle, B Vitamins, Prickly Pear)
The 2022 systematic review of 21 trials found only clove extract, tolfenamic acid, and pyritinol among the more promising interventions identified across the entire literature - and even those are described as preliminary, not as established treatments.
What's Actually Worth Doing - and the Honest Limits of the Evidence
Dehydration, electrolyte loss, blood sugar disruption, and disrupted sleep architecture are the parts of a hangover with the clearest, least disputed physiological basis - alcohol is a diuretic, and a night of drinking reliably disrupts all of these. That doesn't mean there's a deep RCT library proving magnesium or electrolyte supplements cure hangovers; that specific research is thinner than you'd expect for something this physiologically obvious. What it does mean is that addressing demonstrated deficits (fluid, electrolytes, blood sugar) rests on more solid physiological ground than most of what's sold as a dedicated "hangover cure," even without a flashy trial behind each individual nutrient.
Hydrate with electrolytes (sodium, potassium, magnesium) rather than plain water alone, since alcohol depletes more than just fluid volume. Eat before or while drinking to blunt blood sugar swings. Prioritize sleep, since alcohol disrupts sleep architecture even when total sleep time seems normal. None of this is a guaranteed fix - the underlying physiology of why hangovers happen at all is still not fully understood, per multiple researchers in this space - but it targets mechanisms that are actually measurable, rather than a marketing claim attributed to a study that doesn't contain it.
What It Stacks Well With (and What Doesn't Add Much)
Magnesium + Electrolytes
Addresses a demonstrated physiological deficit (alcohol-driven diuresis) rather than a marketing-driven mechanism - the most defensible category here, even without a dedicated hangover RCT to point to.
Food Before/During Drinking
Slows alcohol absorption and blunts the blood sugar disruption that contributes to next-day fatigue and brain fog - simple, unglamorous, and mechanistically solid.
Time and Sleep
No supplement substitutes for this. Hangover symptoms resolve as the body clears alcohol's metabolic byproducts and sleep debt - a process that happens regardless of what you take.
DHM (Tempered Expectations)
Not harmful at studied doses, but the evidence for symptom relief is thin and the "70% reduction" framing some sellers use does not reflect what the underlying research actually shows.
NAC (Tempered Expectations)
Good mechanistic story, no RCT support so far for actual hangover symptom relief. Worth knowing if you're taking it specifically for this purpose rather than another use case.
Pain Relievers (Caution)
Acetaminophen specifically should be avoided with residual alcohol in your system due to additive liver stress - a genuine safety consideration, not just a hangover-efficacy question.
