Beer Info FAQ

Is Ascorbic Acid Bad for Brewing?

Ascorbic acid, also known as vitamin C, is a common additive used in various industries, including brewing. In the brewing process, ascorbic acid is primarily used as an antioxidant to prevent oxidation and maintain the freshness of the beer. However, there are debates among brewers regarding its impact on the overall quality of the final product. This article aims to explore the effects of ascorbic acid on brewing and whether it is considered beneficial or detrimental to beer production.

Effects of Ascorbic Acid in Brewing

Ascorbic acid acts as an antioxidant by scavenging oxygen molecules and preventing them from reacting with beer compounds, which can lead to off-flavors and stale characteristics. By inhibiting oxidation, ascorbic acid helps preserve the beer's aroma, flavor, and color, resulting in a longer shelf life. It is particularly useful in hop-forward beers that are more susceptible to oxidation.

Moreover, ascorbic acid can also enhance yeast health and fermentation performance. It provides yeast cells with essential nutrients, promoting their growth and viability during fermentation. This can lead to improved attenuation, reduced fermentation time, and a cleaner flavor profile in the finished beer.

Controversies and Considerations

While ascorbic acid offers benefits in brewing, there are some controversies and considerations to keep in mind. One concern is the potential for excessive use of ascorbic acid, which can lead to over-antioxidation. This may result in a loss of desirable flavors and aromas, giving the beer a flat or dull character. It is crucial for brewers to use ascorbic acid judiciously and in appropriate quantities to avoid these negative effects.

Additionally, some brewers argue that relying too heavily on ascorbic acid may mask underlying issues in the brewing process. It is essential to address any potential sources of oxidation, such as inadequate packaging techniques or improper handling, rather than solely relying on additives like ascorbic acid. Maintaining proper brewing practices and minimizing oxygen exposure throughout the brewing process should be a priority.


In conclusion, ascorbic acid can be a valuable tool in brewing when used correctly. Its antioxidant properties help prevent oxidation and maintain the freshness of beer, particularly in hop-forward styles. However, it is crucial for brewers to exercise caution and moderation when incorporating ascorbic acid into their recipes. Proper brewing practices and minimizing oxygen exposure should always be the primary focus, with additives like ascorbic acid serving as supplementary measures.

Frequently Asked Questions

Q: Can ascorbic acid completely prevent oxidation in beer? A: While ascorbic acid can help inhibit oxidation, it cannot completely eliminate it. It is essential to combine its use with proper packaging techniques and minimizing oxygen exposure throughout the brewing process.

Q: How much ascorbic acid should I use in my beer? A: The recommended dosage of ascorbic acid varies depending on the beer style and desired outcome. It is best to consult brewing references or seek advice from experienced brewers to determine the appropriate amount for your specific recipe.

Q: Are there any alternatives to ascorbic acid for preventing oxidation in beer? A: Yes, there are other brewing additives and techniques that can help prevent oxidation, such as using antioxidants like metabisulfite or employing modified atmosphere packaging methods. Each method has its advantages and considerations, so it is essential to research and choose the most suitable approach for your brewing process.

Q: Can ascorbic acid affect the flavor of the beer? A: When used in appropriate quantities, ascorbic acid should not significantly impact the flavor of the beer. However, excessive use can lead to a loss of desirable flavors and result in a flat or dull character in the final product.

Q: Is ascorbic acid commonly used in commercial brewing? A: Ascorbic acid is occasionally used in commercial brewing, particularly in styles that are prone to oxidation. However, its usage may vary depending on the specific brewery's practices and preferences.

Remember, proper brewing techniques and minimizing oxygen exposure are crucial for producing high-quality beer, and additives like ascorbic acid should be used as supplementary measures rather than a sole solution.