What Is DHM? Complete Science Guide to Dihydromyricetin (2026)

DHM (dihydromyricetin) is a flavonoid from Japanese raisin tree that prevents hangovers via two pathways: GABA-A receptor protection in the brain and liver enzyme support. Here is the peer-reviewed science.

New to DHM? Skip to the quick summary below, or read the complete DHM guide for practical use. This page is the deep-science explainer.

Quick Summary

DHM (dihydromyricetin) is a flavonoid extracted from the seeds and fruits of Hovenia dulcis — the Japanese raisin tree, used in East Asian medicine for over 500 years to relieve the effects of alcohol. Modern research has identified two primary mechanisms:

1. GABA-A receptor modulation in the brain — DHM blocks alcohol from binding at the receptor's benzodiazepine site (Shen et al. 2012, J Neurosci).
2. Liver enzyme support — DHM increases the expression and activity of alcohol dehydrogenase (ADH) and aldehyde dehydrogenase (ALDH), the two enzymes responsible for clearing ethanol and acetaldehyde (Silva et al. 2020, ACER; He et al. 2024, Front Pharmacol).

A third, increasingly well-documented effect is antioxidant and anti-inflammatory action in liver tissue, mediated through the AMPK/Sirt-1/PGC-1α axis and the Nrf2 pathway (Silva et al. 2020, Alcohol; Janilkarn-Urena et al. 2023, Front Nutr).

Not every study is positive — and we cover the negative ones honestly below.

What Is DHM?

DHM stands for dihydromyricetin, sometimes called ampelopsin in older biochemistry literature. Chemically, it is a flavanonol — a sub-class of flavonoid polyphenols. Its molecular formula is C₁₅H₁₂O₈ and it is structurally similar to the antioxidant quercetin.

DHM was first isolated from Hovenia dulcis (Japanese raisin tree) seeds and fruits in 1997 and is now recognized as the compound responsible for most of the plant's claimed alcohol-protective effects (Sferrazza et al. 2021, Molecules). Hovenia has been used in traditional Chinese, Korean, and Japanese medicine for centuries — typically as a tea or decoction taken before drinking. The earliest documented use traces to the 7th century CE Tang dynasty pharmacopoeia. For more on the plant's history, see our Japanese raisin tree complete guide.

Today, DHM is sold globally as a standardized extract — typically 98%+ pure — in capsule, powder, or liquid form. The U.S. National Institutes of Health LiverTox database lists DHM (under "Dihydromyricetin / Hovenia dulcis") with no documented hepatotoxicity in human use to date.

How is DHM different from other "hangover cures"?

Most hangover products fall into one of three categories:

• Hydration / electrolyte mixes (Pedialyte, Liquid I.V.) — replace fluids but do nothing about acetaldehyde or GABA disruption.
• Probiotic / enzyme drinks (ZBiotics) — target acetaldehyde at the gut level via genetically engineered bacteria, but only the small fraction produced before alcohol hits the liver.
• Liver-support flavonoids (DHM, milk thistle, NAC) — work systemically.

DHM sits in the third category but with a unique advantage: it is the only common over-the-counter compound with documented action on both the liver clearance side and the brain (GABA) side of acute alcohol effects. For a head-to-head, see DHM vs ZBiotics and DHM vs milk thistle.

How Does DHM Work? Three Mechanisms

Mechanism 1: GABA-A Receptor Modulation (Brain)

GABA (gamma-aminobutyric acid) is the brain's primary inhibitory neurotransmitter. The GABA-A receptor is a chloride-ion channel — when GABA binds, the channel opens, neurons hyperpolarize, and brain activity slows. This is why GABA agonists (alcohol, benzodiazepines, barbiturates) cause sedation, motor impairment, and disinhibition.

The foundational paper on DHM and GABA-A is Shen et al. 2012, Journal of Neuroscience from Jing Liang's lab at UCLA. Key findings in rat models:

• DHM at 1 mg/kg (intraperitoneal) reduced ethanol-induced loss of righting reflex from 73.6 minutes to 2.7 minutes — a roughly 96% reduction in acute intoxication duration.
• DHM reduced alcohol-induced anxiety during withdrawal and dropped seizure susceptibility by ~74%.
• The benzodiazepine antagonist flumazenil completely blocked DHM's effects, confirming DHM acts at the benzodiazepine binding site of the GABA-A receptor.
• IC50 (the concentration at which DHM is half-maximally effective) was 4.36 µM, putting it in the same potency range as clinical anxiolytics.

In plain English: DHM competes with alcohol at the same molecular site where alcohol exerts its sedative and disinhibiting effects, while leaving normal GABA signaling intact. This is why people report feeling "clearer" the morning after drinking on DHM. The same GABA-A pathway is the basis for DHM and natural anxiety relief, GABA modulation for sleep protocols, and the complete hangxiety guide.

Mechanism 2: Liver Enzyme Support (ADH and ALDH)

Your liver clears ethanol in two steps:

Ethanol  →[ADH]→  Acetaldehyde  →[ALDH]→  Acetate (harmless)

Acetaldehyde is the toxic intermediate. It is roughly 30× more toxic than ethanol itself and is the molecule responsible for facial flushing, nausea, headache, and the bulk of next-day hangover symptoms. People with the ALDH2*2 variant (common in East Asian populations) have impaired ALDH activity, accumulate acetaldehyde, and experience the well-known "Asian flush" reaction (Brooks et al. 2009, PLoS Med). For more on this genetic context, see our DHM and Asian flush guide.

DHM supports both enzymes:

• Silva et al. 2020, Alcohol: Clinical & Experimental Research showed DHM at 5 and 10 mg/kg increased the expression of alcohol-metabolizing enzymes in chronically alcohol-fed mice, leading to lower circulating ethanol and lower acetaldehyde simultaneously.
• He et al. 2024, Frontiers in Pharmacology reviewed nine bioactive Hovenia compounds and concluded that the genus consistently up-regulates ADH and ALDH activity, accelerating alcohol clearance and "sparing hepatocytes from alcohol-induced effects."
• Sferrazza et al. 2021, Molecules documented that Hovenia / DHM extracts significantly reduce serum AST and ALT (the standard liver-injury markers) across CCl₄, alcohol, paracetamol, and LPS injury models.

The practical consequence: lower peak blood alcohol, faster acetaldehyde turnover, less morning-after symptom load.

Mechanism 3: Antioxidant, Anti-Inflammatory, and Mitochondrial Support

Alcohol metabolism generates reactive oxygen species (ROS) and depletes mitochondrial NAD⁺. Chronic alcohol exposure suppresses AMPK (the cellular energy sensor) and hyperacetylates PGC-1α (the master regulator of mitochondrial biogenesis), driving fatty liver, inflammation, and eventually fibrosis.

DHM intervenes at multiple nodes:

• Silva et al. 2020, Alcohol — DHM at 5 mg/kg IP, five times weekly for 8 weeks, restored AMPK activation, increased cytoplasmic Sirt1 and mitochondrial Sirt3 (each had been reduced 37–43% by alcohol), and produced a 20% increase in mitochondrial DNA content. Hepatic ATP rose from 2.43 nmol/mg in alcohol-only controls to 3.898 nmol/mg with DHM — effectively restoring normal energy metabolism.
• Janilkarn-Urena et al. 2023, Frontiers in Nutrition — DHM reduced TNF-α, IL-6, and IL-17 (the three cytokines most strongly associated with alcoholic liver disease) and increased the protective IL-27. It also increased lipophagy — the cell's ability to selectively recycle fat droplets — through enhanced p62/LC3B/PLIN-1 protein interactions.
• The Nrf2 antioxidant pathway is activated, increasing catalase and heme oxygenase-1 expression while reducing malondialdehyde (a lipid-peroxidation marker) (He et al. 2024).

These effects are why DHM is increasingly investigated for chronic alcohol-associated liver disease, not only acute hangover prevention.

What Does the Research Say?

Here is an honest summary of the most-cited DHM literature, including studies that did not find a benefit:

What we still do not know

• Optimal dose in humans is still being established. Most rodent studies use 1–10 mg/kg IP, which does not translate cleanly to oral human dosing. Practical human dosing has converged on 300–600 mg per session (see our DHM dosage guide).
• Bioavailability of oral DHM is limited. Skotnicová's 2020 negative finding may reflect low oral absorption rather than mechanism failure. Newer phytosome and liposomal formulations show promise.
• Long-term daily use is not well studied. Most safety data covers occasional use of 2–3× per week. See our daily DHM use guide for a fuller treatment.

For a deeper review of all human and animal trials, see our DHM clinical trials roundup.

How to Take DHM

This page is the science explainer — the full dosing protocol lives in our DHM dosage guide. The short version:

• Dose: 300 mg (under 130 lb), 500 mg (130–180 lb), 600 mg (over 180 lb)
• Timing: 30–60 minutes before drinking — pre-loading matters because both GABA-A occupancy and liver enzyme up-regulation take time to peak.
• Co-factors: A small amount of dietary fat boosts absorption ~40%. Adequate hydration matters independently.
• Frequency: Occasional use only (2–3× per week max).

Is DHM Safe?

The NIH LiverTox database lists no documented cases of DHM hepatotoxicity in humans. Toxicology studies in rodents place LD50 above 5,000 mg/kg — an extremely wide safety margin compared to typical 5–10 mg/kg effective doses.

Key safety points (full coverage in our DHM safety guide):

• No documented drug interactions in clinical literature for occasional use, but DHM is metabolized by the liver — caution with warfarin, diabetes medications, and other liver supplements.
• No tolerance or dependence — unlike benzodiazepines, DHM does not produce GABA-A receptor down-regulation in chronic-use studies.
• Short half-life of 2–4 hours means it does not accumulate.
• Avoid in pregnancy — no safety data exists. Same for nursing mothers, and consult a hepatologist if you have any pre-existing liver condition.

DHM vs Other Hangover Supplements

DHM is the only widely-available compound that addresses both the brain (GABA) and liver (enzyme) sides of alcohol's effects. See the head-to-heads: DHM vs ZBiotics and DHM vs milk thistle.

Frequently Asked Questions

See the FAQ section below for 15+ questions on DHM science, mechanism, dosing, and safety — auto-loaded as Schema.org FAQPage structured data.

Bottom Line

DHM (dihydromyricetin) is a peer-reviewed flavonoid with two well-characterized mechanisms — GABA-A receptor modulation and liver enzyme up-regulation — plus a third antioxidant/anti-inflammatory effect emerging in newer research. The animal evidence is strong, the human evidence is growing (one published RCT and several smaller trials), and the safety profile is excellent.

It is not magic. Bioavailability is the biggest practical limitation, and a 2020 Czech study failed to replicate the metabolic effects when DHM was given orally. But across the body of evidence, DHM consistently outperforms placebo on the dimensions that matter for hangover prevention: faster ethanol clearance, lower acetaldehyde load, and less GABA-A disruption.

For the practical protocol, see our complete DHM guide. For specific products, see our independent DHM reviews.

This article is for educational purposes and does not replace medical advice. Individual responses vary. Consult a healthcare provider before starting any supplement regimen, especially if you take prescription medications or have a liver condition.

References

1. Shen Y, Lindemeyer AK, Gonzalez C, et al. Dihydromyricetin as a Novel Anti-Alcohol Intoxication Medication. J Neurosci 2012;32(1):390–401. PMC3292407
2. Silva J, Yu X, Moradian R, et al. Dihydromyricetin Protects the Liver via Changes in Lipid Metabolism and Enhanced Ethanol Metabolism. Alcohol Clin Exp Res 2020;44(5):1046–1060. PMC7211127
3. Silva J, Spatz MH, Folk C, et al. Dihydromyricetin Improves Mitochondrial Outcomes in the Liver of Alcohol-Fed Mice via the AMPK/Sirt-1/PGC-1α Signaling Axis. Alcohol 2021;91:1–9. PMC7902334
4. Janilkarn-Urena I, Idrissova A, Zhang M, et al. Dihydromyricetin supplementation improves ethanol-induced lipid accumulation and inflammation. Front Nutr 2023;10:1201007. PMC10481966
5. Sferrazza G, Brusotti G, et al. Hovenia dulcis Thunberg: Phytochemistry, Pharmacology, Toxicology and Regulatory Framework. Molecules 2021;26(4):903. PMC7914479
6. He YX, Liu MN, Wang YY, et al. Hovenia dulcis: a Chinese medicine that plays an essential role in alcohol-associated liver disease. Front Pharmacol 2024. PMC11033337
7. Skotnicová P, et al. Does Dihydromyricetin Impact on Alcohol Metabolism. Physiol Res 2020. PMC8603706
8. Clinical Evaluation of Hovenia dulcis Extract Combinations for Effective Hangover Relief in Humans. Foods 2024;13(24):4021. PMC11675335
9. Brooks PJ, Enoch MA, Goldman D, et al. The Alcohol Flushing Response: An Unrecognized Risk Factor for Esophageal Cancer from Alcohol Consumption. PLoS Med 2009;6(3):e50. PMC2680547

Continue Your Research

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• Clinical Research → - 11 peer-reviewed DHM studies