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Adjuncts in beer: corn, rice and sugar

Most beers are made from barley malt, but it is not the only raw material in the brewing kettle. Beside malt, so-called adjuncts often appear: unmalted raw materials such as corn, rice, sugar and other sources of fermentable sugars. For many people the word adjunct sounds suspicious, like a shortcut to cheap beer, but the reality is far more interesting. Unmalted raw materials are a tool that breweries use deliberately to shape the body, flavour and character of beer. In this post you will learn what adjuncts are, why they are used, how rice, corn and sugar work, and whether their presence is a flaw or an asset. It is a journey into the recipe of beer, which will show that it is not always about economy, and often about style. Let us start with what an adjunct even is.

What an adjunct is

An adjunct in brewing is any unmalted source of fermentable sugars, added to the main grist, that is barley malt. Adjuncts can be grains (corn, rice, unmalted wheat), sugars (corn syrup, candi sugar) or other starchy raw materials. What links them is that they supply sugars for fermentation, but are not malted barley. Barley malt gives beer not only sugars, but also enzymes, proteins, colour and a characteristic malty flavour. Adjuncts usually supply mainly sugars, adding little of their own. That is why they are such a useful tool: they let you change the profile of beer, adding fermentable sugars without adding malty flavour. An adjunct is thus not by definition something worse - it is simply a raw material with a role different from malt. Understanding what an adjunct is is the key to this post. So let us get to know why breweries reach for them at all.

Why breweries use adjuncts

Breweries use adjuncts for several different reasons, not only to save money. First, to lighten body and flavour: raw materials such as rice and corn slim down the beer, making it lighter, less dense and more crisp. Second, to change the flavour profile: adjuncts let you bring out or mute particular traits of beer. Third, for economic and historical reasons: after prohibition American breweries gradually increased the proportion of adjuncts, mainly corn, to meet demand for lighter products and to reduce production costs. Fourth, to increase strength without increasing body, which is achieved with sugars. Adjuncts are thus a multifunctional tool: sometimes it is about price, sometimes about style, and sometimes about both. The key is intention: the same raw material can be used to make a cheap mass beer or a refined Belgian tripel. Let us now get to know the three most important adjuncts, starting with rice.

Rice - dryness and crispness

Rice is one of the most common adjuncts, valued for its neutrality. Rice has hardly any taste of its own, which is its greatest asset: it does not get in the way of the basic malt character of the beer, but slims it down. Thanks to this rice gives a dry, crisp and clean beer, with a pure, snappy finish. It is precisely rice that is the secret of some famous pale lagers, to which it gives a characteristic lightness and clarity. Unlike corn, which brings a delicate sweetness, rice is almost completely neutral in flavour, which is why it gives an even more dry effect. Rice supplies fermentable sugars without burdening the beer with body or flavour. It is a raw material for those who want a light, clean, refreshing beer. Contrary to popular opinion, rice in beer is not a sign of cheapness, but a deliberate stylistic choice, giving a concrete, desired effect - the dryness and crispness that is hard to achieve with malt alone.

Corn - lightness and mildness

Corn is the second classic adjunct, particularly popular in American pale lagers. It gives beer lightness, but unlike neutral rice it also brings a subtle sweetness and mildness, sometimes described as a slightly corny or grainy note. Corn is often used in the form of corn syrup, which is highly fermentable, or as corn flakes. Historically it was precisely corn that became the main adjunct of American brewing after prohibition, when breweries aimed for lighter, cheaper beers suited to consumer tastes. Corn slims down the body of the beer and makes it more approachable, smooth and mild. It is a raw material that gives many mass lagers their characteristic, delicate profile. Although associated mainly with cheap beer, corn is also used deliberately, for example in recreating classic, historical styles of beer from years past. Corn is a raw material of lightness and mildness, and its role in beer is greater than many think.

Sugar - strength without body

Sugar is an adjunct of a slightly different action than grains: it does not so much slim down the beer as increase its strength without adding body. Simple sugars are almost completely fermentable, so the yeast turns them into alcohol almost entirely, raising the alcohol content and improving attenuation. Thanks to this sugar lightens the body and makes the beer more dry and less cloying. It is a key raw material in strong Belgian beers: strong Belgian ales of all kinds rely on candi sugar to add strength and prevent the cloying sweetness that would appear if the whole strength were built from malt alone. Some sugars, like dark candi sugar, also bring their own flavour, notes of caramel or dried fruit. Sugar is thus a tool of precision: it lets you raise the strength without making the beer heavy and sluggish. It is proof that an adjunct can be a refined ingredient of the best beers in the world, and not only a way to save money.

Adjuncts and the flavour of beer

The influence of adjuncts on the flavour of beer depends on which raw material and in what amount is used. Raw materials such as rice and corn supply fermentable sugars, adding little flavour of their own, thanks to which they let the flavours of malt, hops and yeast shine. That is why beers with a large proportion of adjuncts are sometimes described as clean, light and crisp. On the other hand, an excess of adjuncts at the expense of malt can make beer flat, devoid of character and depth - and this is precisely what cheap, mass lagers are accused of. It all depends on balance and intention. In the hands of a good brewer an adjunct is a tool to achieve a particular style, and not a way to water down the beer. Sugar in turn can add its own flavour to the beer or, in the refined version, only strength. Adjuncts are thus morally neutral: they can impoverish the beer or enrich it, depending on how they are used. We write more about how malt shapes flavour in our post on specialty malts.

An adjunct is not cheating

In beer circles the word adjunct is sometimes used contemptuously, as a synonym for cheap, inferior beer. It is a simplification worth dispelling. Yes, adjuncts are sometimes used to reduce costs and produce light, mass lagers of little character. But the same raw material is also an indispensable element of the most outstanding beers in the world. Belgian tripels and quadrupels would not exist without candi sugar, Japanese lagers owe their clarity to rice, and many historical styles required adjuncts for authenticity. The German Reinheitsgebot, that is the purity law allowing only malt, hops, water and yeast, shaped the belief that an adjunct is a blemish - but it is a local tradition, not a universal truth. An adjunct is not cheating, but a tool. What matters is how it is used: whether to water down the beer, or to achieve the intended, refined style. Judging beer by the mere presence of an adjunct is a mistake - what matters is the effect in the glass, not the list of raw materials.

Three adjuncts in a table

Let us set the three most important unmalted raw materials side by side, to see their role:

The table shows that each adjunct plays a different role. Rice slims down and gives dryness, corn adds lightness and mild sweetness, sugar raises strength without burdening the beer with body. These are three different tools, used for different purposes. Despite the common name of adjuncts, their action is different. A good brewer matches the raw material to the effect he wants to achieve. It is proof that unmalted raw materials are deliberate recipe decisions, and not chance.

Why it is worth understanding adjuncts

Understanding the role of adjuncts changes the way we perceive beer. First, it lets you judge beer fairly: instead of rejecting it for the mere presence of corn or rice, we can assess whether the adjunct was used sensibly. Second, it teaches you to appreciate styles of which an adjunct is an integral part, from Japanese lagers to Belgian strong ales. Third, it unmasks simplifications: not every beer with an adjunct is cheap, and not every beer without an adjunct is good. A conscious taster knows that what matters is the effect in the glass, and not the ideology of the raw material. Getting to know adjuncts is a step towards a deeper understanding of brewing, in which every ingredient has its function. Instead of repeating simplified slogans, it is worth looking at beer as a whole and appreciating the craft of the recipe. It is knowledge that enriches tasting and lets you draw more from beer, regardless of whether the kettle held only malt, or also rice, corn or sugar.

The key points in a nutshell

Adjuncts are unmalted sources of fermentable sugars, added to barley malt: corn, rice, sugar and others. Breweries use them to lighten body, change flavour, reduce costs or increase strength. Rice is almost neutral and gives a dry and crisp beer, corn adds lightness and mild sweetness, and sugar raises strength without burdening the body, which is key in strong Belgian ales. An adjunct is not cheating nor a sign of cheapness - it is a tool that can impoverish or enrich beer depending on how it is used. What matters is the effect in the glass, not the list of raw materials. Want to judge beers with and without adjuncts and record your impressions? Keep tasting notes in the GustoNote app. See also our posts on specialty malts and on mashing.