Cognac contains more antioxidants than most spirits, but it’s still a 40% alcohol drink, and the health risks of alcohol outweigh any benefits from those compounds. A standard 1.5-ounce shot has 96 calories, zero sugar, and zero carbs, making it one of the leaner alcoholic options. But “leaner” and “good for you” are different things.
What Makes Cognac Different From Other Spirits
Cognac spends years aging in oak barrels, and that process gives it something most clear spirits lack: plant-based antioxidants. As the spirit sits in wood, it pulls out compounds called ellagitannins, large molecules with multiple active sites that are especially effective at neutralizing free radicals. Research published in the Journal of Agricultural and Food Chemistry found that these ellagitannins are the primary driver of cognac’s antioxidant activity, with concentrations ranging from 0 to 45.3 mg per liter depending on how long the spirit was aged.
The aging process also releases ellagic acid, a compound with free-radical-scavenging power comparable to vitamin C and vitamin E. Cognac contains between 3.9 and 23.9 mg per liter of ellagic acid. On top of that, barrel aging introduces phenolic aldehydes like vanillin and syringaldehyde from the breakdown of lignin in the wood. These contribute to cognac’s vanilla and spice notes, but they also carry mild antioxidant properties.
When researchers compared cognac’s antioxidant strength to red wine on a per-milligram basis, cognac actually scored higher. That sounds impressive until you consider serving sizes: a glass of red wine delivers far more total polyphenols than a shot of cognac because you drink roughly five times the volume.
The Heart Health Question
The idea that cognac protects your heart is one of the most persistent claims about the drink. A study in Cardiovascular Ultrasound tested this directly by measuring coronary blood flow in healthy young men before and after drinking cognac at moderate and higher doses. The result: cognac increased antioxidant levels in the blood, but it had no measurable effect on coronary circulation. Blood flow through the heart’s arteries didn’t improve, and the vessels didn’t relax or widen in any meaningful way.
This matters because the supposed cardiovascular benefit of moderate drinking has been questioned broadly in recent years. Earlier studies suggesting a protective effect often had design flaws, including comparing drinkers to “non-drinkers” who had actually quit drinking due to illness. The cognac-specific evidence doesn’t support the idea that a nightly glass is doing your heart any favors.
Cognac as a Digestive Aid
Ordering cognac after dinner as a “digestif” is a tradition in French cuisine, and plenty of people swear it settles the stomach. The physiology tells a different story. Research on alcohol and gastric acid found that high-proof beverages like cognac, whisky, and gin do not stimulate stomach acid secretion or trigger the release of gastrin, the hormone that drives digestion. Lower-alcohol drinks like beer and wine do stimulate acid production, but cognac sits in the category that essentially does nothing for your digestive process.
Any warm, relaxed feeling after a post-meal cognac is real, but it comes from alcohol’s sedative effect on your nervous system, not from improved digestion. If anything, alcohol slows gastric emptying, meaning food sits in your stomach longer rather than being processed more efficiently.
Effects on Blood Sugar
Because cognac has zero sugar and zero carbs, it doesn’t spike blood glucose the way a cocktail mixed with juice or soda would. But alcohol itself has complex effects on how your body handles sugar. In people who haven’t eaten recently, alcohol can actually lower blood glucose by interfering with the liver’s ability to produce new glucose. After a normal meal, the effect is less predictable: studies have shown that alcohol can improve, worsen, or have no effect on glucose tolerance depending on the dose, timing, and individual metabolism.
For people managing type 2 diabetes, this unpredictability is the core concern. Alcohol can mask or worsen low blood sugar episodes, and it puts extra strain on the liver at a time when it’s already working to regulate glucose. A zero-sugar spirit isn’t the same as a blood-sugar-friendly one.
The Antioxidant Paradox
Cognac’s ellagic acid is a genuinely interesting compound. It chelates metals, protects DNA from damage, reduces markers of oxidative stress, and activates your body’s own antioxidant defenses like glutathione and catalase. In lab studies, it prevents the kind of fat oxidation linked to chronic disease. These are real, well-documented effects.
The problem is delivery. To get a meaningful dose of ellagic acid from cognac, you’d need to drink amounts that would cause serious harm from the alcohol itself. A handful of raspberries, pomegranate seeds, or walnuts delivers more ellagic acid than several shots of cognac, with no liver toxicity attached. The antioxidants in cognac are real but irrelevant at responsible drinking levels.
What the Risks Actually Look Like
The World Health Organization classifies alcoholic beverages as a Group 1 carcinogen, the same category as tobacco smoke and asbestos. This isn’t new or controversial: the classification has been in place for decades, and as of 2025, the WHO’s position remains that no level of alcohol consumption is free of health risk. The strongest links are to cancers of the mouth, throat, esophagus, liver, and breast.
A single shot of cognac contains about 14 grams of pure alcohol. Even at one drink per day, long-term consumption raises the risk of several cancers, liver disease, and dependency. The antioxidant content of cognac doesn’t offset this. Your body metabolizes alcohol into acetaldehyde, a toxic compound that damages DNA regardless of what other molecules came along for the ride.
Putting It in Perspective
If you enjoy cognac occasionally, the realistic health picture is straightforward. At 96 calories per shot with no sugar, it’s a relatively clean alcoholic choice compared to sweetened cocktails or heavy beers. Its oak-derived antioxidants give it a modest edge over vodka or gin in terms of polyphenol content. But those compounds exist in far higher concentrations in fruits, vegetables, nuts, and tea, all of which come without the documented harms of ethanol.
Cognac is a well-crafted spirit with genuinely interesting chemistry. It is not, by any current evidence, good for you.