Glutathione is a small molecule your cells make themselves, from three amino acids, and it is one of the body's own antioxidants. Alcohol is broken down in a chain of steps, and some of those steps create reactive byproducts that antioxidants help manage.

That overlap is why glutathione comes up so often in talk about drinking. Below: what glutathione is, how alcohol is metabolized, and what research on oral glutathione does and does not show, including one human trial with a mixed result. If the category is new to you, start with our guide to what a pre-drink supplement is.

What glutathione is

Glutathione is a tripeptide, which means a short chain of three amino acids: glutamate, cysteine and glycine. Cells make it themselves, and it is the most abundant small thiol (a sulfur-containing molecule) found inside cells, according to a standard 2009 review.

Its best-known job is protecting cells from oxidative damage. Oxidative stress is what happens when reactive, oxygen-containing molecules build up faster than cells can neutralize them. Glutathione helps neutralize them. It also helps cells deal with certain foreign compounds and helps keep their internal chemistry balanced.

Glutathione comes in two forms. The reduced form, GSH, is the active one. After it neutralizes a reactive molecule it becomes the oxidized form, GSSG, and cells use enzymes to convert it back. That cycle matters later, because it is one reason the enzymes around glutathione get as much attention as glutathione itself.

How alcohol is metabolized

Most alcohol is broken down in the liver, in a short series of enzyme steps. The main enzymes are alcohol dehydrogenase (ADH), aldehyde dehydrogenase (ALDH), cytochrome P450 2E1 (CYP2E1) and catalase.

Ethanol to acetaldehyde

ADH converts ethanol, the alcohol in drinks, into acetaldehyde. Acetaldehyde is a reactive compound, so the body does not leave it around for long.

Acetaldehyde to acetate

ALDH converts acetaldehyde to acetate, which the body clears further. The genes for these enzymes vary from person to person, and those differences have been linked to drinking patterns and alcohol-related harm.

Where oxidative stress comes in

A 2006 review from the National Institute on Alcohol Abuse and Alcoholism lists two effects of alcohol metabolism that matter here. It creates reactive oxygen species, and it shifts the cell's redox balance. Those are the conditions in which antioxidants such as glutathione do their work.

What hangover studies show

A 2020 review of the hangover literature found that faster elimination of ethanol was associated with less severe hangovers. It found a similar link for some markers of oxidative stress, but the pattern was mixed. More oxidative stress soon after drinking went with milder hangovers the next day. More oxidative stress later went with worse ones. The association with acetaldehyde was not significant. The authors called for more research. Keep that in mind, because acetaldehyde is the measure the 2024 trial below improved.

Does drinking lower glutathione?

We cannot give you a solid yes or no for social drinking. The chemistry says alcohol metabolism generates reactive oxygen species, and glutathione is one of the cell's tools for managing them. We are not citing a human study showing that a night of moderate drinking measurably lowers glutathione, so we do not claim it.

There is animal work. A rat study of binge-level alcohol found that glutathione and a glutathione-enriched yeast extract changed activity of alcohol-metabolizing enzymes and antioxidant markers. The yeast extract came from Samyang Corp., whose employees co-authored the paper. That is a rat study. It does not tell us what happens in people, and we do not use it to suggest a benefit.

What oral glutathione research shows

Human research on oral glutathione is small and mixed. Absorption studies disagree, and the one alcohol trial lowered acetaldehyde without improving hangover scores.

Can the body absorb glutathione from a capsule?

Early and later human studies point in different directions. In a 1992 study, seven healthy volunteers took a single 3 g dose of glutathione. Plasma glutathione did not rise significantly, and the authors pointed to breakdown by enzymes in the gut and liver.

A 2015 randomized trial looked at daily use over a longer period. In 54 non-smoking adults taking 250 or 1,000 mg a day for six months, blood glutathione rose. In most cases it returned to baseline after a one-month washout. Neither study reports an alcohol challenge, so neither speaks to drinking. The second used daily dosing over months, which is a different pattern from a single dose before an evening out.

The 2024 Nutrients trial

The closest human test of our question is a randomized, double-blind, placebo-controlled crossover trial published in Nutrients in 2024. Here is what it did and found.

• Who: 40 healthy adults aged 19 to 40 in South Korea who had experienced hangovers before. Thirty-six were included in the analysis.
• What they took: capsules of a yeast extract supplying 50 mg of glutathione, or a placebo, in separate sessions one week apart.
• The drinking: whiskey dosed at 0.78 g of alcohol per kg of body weight. Blood was sampled over 15 hours.
• Acetaldehyde: serum acetaldehyde was significantly lower with glutathione than with placebo. Peak levels were roughly half.
• Alcohol levels: lower with glutathione, but the difference was not statistically significant.
• Hangover scores: no significant difference between groups on the Acute Hangover Scale or the Alcohol Hangover Severity Scale.

The authors concluded that glutathione lowered acetaldehyde, which they called a crucial factor in alcohol metabolism, and suggested this effect may bear on hangover symptoms. The symptom scores they measured did not show a difference. They also noted that the questionnaires are subjective and varied widely between people.

Three things to weigh. First, three of the six authors are employed by Samyang Corp., which supplied the glutathione, and the paper discloses this. The paper also states that it received no external financial support. Second, it is one small trial with one dose and one drinking protocol. Third, the glutathione was a yeast extract containing glutathione, not a purified powder.

What this means for First Round

This article cites no study of First Round or of 300 mg of L-Glutathione. The 2024 trial used a different form and dose, so its results do not carry over, and we do not apply its acetaldehyde result to First Round.

What we can describe is how the formula is designed.

First Round's four-stage glutathione design

First Round is built around a four-stage glutathione support architecture: Supply, Build, Enable, Recycle.* Its 13 ingredients include L-Glutathione (300 mg), L-Cysteine HCl Anhydrous (450 mg) and selenium as L-Selenomethionine (100 mcg), each disclosed on the label with no proprietary blends.

You can see every ingredient and dose on the First Round facts page and on the First Round product page. Directions are 4 capsules with water, 30 to 60 minutes before drinking alcohol, and no more than 8 capsules in 24 hours.

Drinking responsibly

Alcohol is for adults 21 and over, and moderation is the point. A supplement does not change how impaired you are, and First Round will not prevent intoxication. Never drive after drinking. If you are pregnant, nursing, taking medication or have a medical condition, ask a healthcare professional before using any supplement. For what else shapes the day after, read why the next day feels off, and for the formula's other lead ingredient, see what the DHM research says.

Frequently asked questions

Does glutathione help with a hangover?

The evidence is limited. In a 2024 crossover trial, 50 mg of glutathione in a yeast extract lowered blood acetaldehyde, but hangover scores did not differ significantly from placebo. That is one small study from authors with a link to the glutathione supplier, so it does not establish that glutathione helps with a hangover.

Does alcohol deplete glutathione?

There is no human study we can cite showing that it does. Alcohol metabolism produces reactive oxygen species, and glutathione is one of the cell's tools for managing oxidative stress. But whether a night of moderate drinking measurably lowers glutathione in people has not been shown, so we do not claim it.

Can you absorb glutathione from a capsule?

Studies disagree. A 1992 study found no significant rise in plasma glutathione after a single 3 g dose in seven healthy volunteers. A 2015 trial found blood glutathione rose after months of daily 250 or 1,000 mg doses in 54 adults. Dose, duration and form all differ between studies, so the question is not settled.

Does taking glutathione make drinking safer?

No. Nothing we found shows that glutathione or any supplement makes drinking safer or changes how impaired you are. Alcohol carries its own risks, and the safest approach is moderation, or not drinking. Never drive after drinking. If you take medication or have a medical condition, ask a healthcare professional first.

What is glutathione made of?

Glutathione is a tripeptide built from three amino acids: glutamate, cysteine and glycine. Cells assemble it themselves, which is why it is often described as the body's own antioxidant. Cysteine is the one that contains sulfur, which gives glutathione its thiol group.

How we wrote this

This article was written by the Supreme Balance Editorial Team. Supreme Balance makes First Round, a pre-drink dietary supplement, so we have a commercial interest in this topic. We link our sources below, we describe what the research does and does not show, and nothing here is medical advice. Last updated November 1, 2026.