Neutral alcohol is ethanol distilled to such a high purity that it has virtually no flavor, aroma, or color of its own. Under U.S. federal regulations, it must be distilled to at least 95% alcohol by volume (190 proof) to earn the designation “neutral spirits” or “alcohol.” At that concentration, nearly all the flavor compounds from the original fermented material have been stripped away, leaving behind what is essentially pure ethanol and water.
Why It’s Called “Neutral”
Every fermented liquid contains minor compounds beyond ethanol. These are collectively called congeners, and they include things like fusel oils, esters, aldehydes, and traces of methanol. Congeners are what give bourbon its caramel warmth, red wine its complexity, and rum its sweetness. A spirit distilled to 95% ABV has had virtually all of these removed. The result is “neutral” because it contributes no distinctive taste or smell. It’s a blank canvas.
Research comparing high-congener drinks like bourbon to essentially congener-free drinks like vodka has confirmed that the two sit at opposite ends of the purity spectrum. Bourbon’s rich flavor profile comes directly from the compounds that neutral alcohol lacks.
What It’s Made From
Neutral alcohol can be produced from almost any fermentable material. The most common feedstocks are grains: corn, wheat, barley, and rye. When made from grain, the product is often labeled “neutral grain spirits” or NGS. But sugar beets, sugarcane, molasses, grapes, and potatoes all work too. Because the distillation process removes so much of the original character, the starting material matters far less than it does for something like single malt whiskey. A corn-based neutral spirit and a grape-based one, both distilled to 95%, taste nearly identical.
How It’s Produced
Making neutral alcohol takes more than a simple pot still. The process typically involves multiple distillation columns working in sequence, each one targeting a specific class of impurity.
In a common industrial setup, fuel-grade ethanol is first diluted with water in a tall column called a hydroselection column (around 50 trays). Adding water changes the behavior of heavier alcohols (fusel oils), making them easier to separate. They rise to the top and get drawn off, while a diluted but cleaner ethanol stream exits from the bottom.
That stream then enters a rectification column, which can have 60 to 80 trays. Here the ethanol is concentrated back up to around 94% by weight, and lighter volatile compounds like acetaldehyde and acetone are pulled off the top. Finally, the concentrated ethanol passes through a demethylization column, where methanol is removed as a separate stream. The neutral alcohol exits from the bottom of this last column.
There’s a hard ceiling on how pure you can get through normal distillation. Ethanol and water form what chemists call an azeotrope at roughly 95.6% ethanol. At that concentration, the two liquids boil together as if they were a single substance, so standard distillation can’t push the purity any higher. Getting to 100% (absolute ethanol) requires special techniques like vacuum distillation or molecular sieves, but for beverage and most industrial purposes, 95% is the target.
Uses in the Beverage Industry
Neutral alcohol is the backbone of several major spirit categories. Vodka is the most straightforward example: it’s neutral spirit diluted with water to bottling strength (typically 40% ABV or 80 proof), sometimes filtered through charcoal for extra smoothness. If bottled in the U.S., it must be bottled at no less than 40% ABV.
Gin starts from the same base. Producers take neutral spirit and redistill or infuse it with botanicals, primarily juniper berries, along with ingredients like coriander, citrus peel, and angelica root. The neutral base lets those botanical flavors come through cleanly without competing grain or fruit notes. Cream liqueurs, cordials, and many flavored spirits also begin with neutral alcohol as their foundation.
Uses Beyond Drinking
Outside of beverages, neutral alcohol serves as a solvent and extraction medium. Herbalists prefer it for making tinctures because its lack of flavor lets the character of the plant material come through. Vodka is a popular choice for home tincture-making for exactly this reason. A typical tincture uses one part herb to three parts alcohol, while a stronger extract uses a one-to-one ratio.
Neutral alcohol also appears in the cosmetics and pharmaceutical industries, where high-purity ethanol is needed as a carrier or preservative. In perfumery, it dissolves fragrance oils without adding a scent of its own.
Food-Grade vs. Denatured Alcohol
Not all high-purity ethanol is meant for drinking. The distinction comes down to one thing: additives. Food-grade neutral spirits remain unmodified after distillation. They’re the same ethanol found in beer, wine, and liquor, just at a much higher concentration.
Denatured alcohol has small amounts of chemicals added to make it undrinkable. These denaturants, which can include methanol or bitter-tasting compounds, don’t change ethanol’s effectiveness as a solvent or cleaning agent, but they make it taste terrible (or toxic) so it can be sold without the taxes and regulations that apply to beverage alcohol. If you’re buying ethanol for consumption, extraction, or anything that contacts food, you need the undenatured, food-grade version.
How Neutral Alcohol Differs From Other Spirits
The simplest way to understand neutral alcohol is to compare it with what it’s not. Whiskey is typically distilled to somewhere between 65% and 80% ABV, deliberately preserving grain character and congeners that will develop further during barrel aging. Brandy keeps fruit-derived flavors. Rum retains molasses richness. All of these spirits are distilled at lower proofs precisely because the goal is to carry flavor forward.
Neutral alcohol takes the opposite approach. By pushing distillation to 95% and running the liquid through multiple purification stages, producers eliminate almost everything except ethanol and water. The result is a product defined not by what it contains, but by what it doesn’t.