HOW DHM WORKS: THE ADH/ALDH PATHWAY

The Two Enzymes That Actually Matter

When you drink, your liver does most of the cleanup work, and the pathway is short. Alcohol dehydrogenase (ADH) converts ethanol into acetaldehyde. Aldehyde dehydrogenase (ALDH) then converts that acetaldehyde into acetate, which your body breaks down into water and carbon dioxide and clears out¹.

Acetaldehyde is the problem molecule in this whole sequence. It is classified as a known carcinogen, it binds readily to proteins and DNA, and it is the chemical mostly responsible for flushing, nausea, and the morning-after damage people associate with drinking¹. The longer it lingers, the more harm it does. So the speed of step two -- ALDH clearing acetaldehyde -- matters more than almost anything else in the pathway.

Why the Pathway Bottlenecks

ADH is fast at the start. ALDH is slower. That mismatch is the entire reason hangovers exist as a category of human suffering. The genetic variant that causes the so-called Asian flush is a useful natural experiment here: people who carry the ALDH2 variant convert ethanol to acetaldehyde at normal speed but cannot clear the acetaldehyde efficiently, and the symptoms scale almost exactly with how much of it accumulates².

There is a second bottleneck too, and it is NAD+. Both ADH and ALDH need NAD+ as a cofactor to do their jobs, and ethanol metabolism depletes NAD+ in the liver as it runs. When NAD+ drops, both enzymes slow down, which is why a third drink lingers longer than a first.

What DHM Does to the Pathway

DHM does not replace ADH or ALDH. The idea is that it induces them -- meaning the liver produces more of them -- and helps restore the NAD+ that ethanol depletes during cleanup. In a 2020 mouse study, animals given injected DHM showed lower serum ethanol, lower serum acetaldehyde, restored hepatic NAD+, and induced expression of both ADH1 and ALDH2 compared to controls³.

But the enzyme story isn't the whole picture, and I want to be honest about that. A 2020 rat study titled "Does Dihydromyricetin Impact on Alcohol Metabolism?" gave DHM by mouth along with alcohol and found no change in ADH activity or expression, and no drop in blood alcohol or acetaldehyde⁴. Its authors concluded that "the proposed positive effect of DHM during alcohol intoxication has not been proven." The groups were very small, so it does not settle the question either way. (this is one of those situations where the popular explanation runs ahead of the data.)

What That Looks Like in a Person

I'm not a biochemist. I ran about 150 self-tests because the products I tried didn't do what I needed, and the ADH/ALDH model is the one I used to choose which ingredients to test. The 2012 paper by Shen and colleagues is the study that first put DHM on most researchers' radar. It was a study in rats, using injected DHM, and it found that DHM counteracted alcohol intoxication ⁵.

DHM also reduces the markers of liver stress (AST and ALT) when those values sit in the normal range, which is what you would expect if the enzyme system is doing its job more efficiently and the liver is taking less collateral damage during cleanup³.

What This Page Is Not Claiming

DHM is not a license to drink more. The pathway has limits, the liver has limits, and acetaldehyde damage scales with total exposure regardless of how fast you clear it. What DHM is meant to do, going by the animal studies that found an effect, is shift the curve so you metabolize the same amount of alcohol with less acetaldehyde lingering between step one and step two.

That is the mechanism as the animal research describes it, with the mixed results above. Where our 1,500mg of DHM came from is covered on the DHM dose-response page, and the GABA side of DHM (a separate mechanism that affects how alcohol feels rather than how it metabolizes) is covered in DHM and GABA modulation.