Is there gluten in powdered sugar?

Quick Answer

Most powdered sugar does not contain gluten. Powdered sugar is made by pulverizing granulated sugar into a fine powder. The key ingredients are just granulated sugar and cornstarch – neither of which contain gluten. However, some brands may add wheat starch, which does contain gluten. So check the label carefully. If the ingredients just list sugar and cornstarch, then the powdered sugar is gluten free.

What is Powdered Sugar?

Powdered sugar, also called confectioners’ sugar or icing sugar, is a finely ground sugar produced by milling granulated sugar into a powdered form. It typically contains about 3% cornstarch to prevent caking and improve flowability.

The main ingredients in powdered sugar are:

– Sugar: Usually made from either cane or beet. Does not contain gluten.

– Cornstarch: Used as an anti-caking agent. Cornstarch is naturally gluten free.

So powdered sugar made with just sugar and cornstarch contains no gluten and is considered gluten free.

Some brands may also add small amounts of wheat starch rather than cornstarch. Wheat starch does contain gluten. So powdered sugar with added wheat starch would not be gluten free.

Is All Powdered Sugar Gluten Free?

Most major brands of powdered sugar use cornstarch rather than wheat starch as the anti-caking agent. This includes big names like Domino, C&H, and Dixie Crystals. So these brands would be gluten free.

However, some store brands or lesser-known brands may potentially use wheat starch instead of cornstarch to cut costs. Powdered sugar containing wheat starch would contain gluten.

So you always need to check the ingredients list on the packaging to be sure. As long as the ingredients just list sugar and cornstarch, without any mention of wheat starch, the powdered sugar will be gluten free.

According to, the following major brands of powdered sugar are gluten free:

– Domino
– C&H
– Dixie Crystals
– Florida Crystals
– Imperial Sugar
– Whole Foods 365 Everyday Value

So most major supermarket brands of powdered sugar are gluten free. But when in doubt, check the ingredients.

Why Powdered Sugar is Typically Gluten Free

There are a few reasons why powdered sugar is mostly gluten free:

– Sugar itself does not contain gluten. The base ingredient is just granulated cane or beet sugar which is naturally gluten free.

– Cornstarch is used more often than wheat starch. Cornstarch performs the same anti-caking function as wheat starch, but is naturally gluten free. Most brands opt for cornstarch.

– Wheat starch costs more. Wheat starch is more expensive than cornstarch. So brands have an economic incentive to use cornstarch where possible.

– Special equipment may be needed for wheat starch. Powdered sugar made with wheat starch requires special manufacturing equipment to achieve the right powder texture. So smaller brands tend to avoid wheat starch for this reason.

So between the naturally gluten free base ingredients, the cost incentives, and manufacturing considerations, most powdered sugar ends up being gluten free. But again, it’s always smart to verify by checking the ingredients.

Why Some Powdered Sugar Contains Wheat Starch

While it’s less common, some powdered sugar brands do use wheat starch instead of cornstarch as the anti-caking agent. Here are some reasons why wheat starch may be used in certain products:

– It helps achieve an extra fine, silky texture. The finely ground texture of wheat starch can contribute to an ultra-smooth powdered sugar.

– It can improve moisture retention. Wheat starch absorbs a bit more moisture than cornstarch. This can help keep the powdered sugar from drying out.

– It allows using less total anti-caking agent. Wheat starch is more effective than cornstarch, so you can use less of it.

– It works well in automated production lines. Wheat starch flows smoothly in high-speed packaging equipment.

– It may be cheaper for some manufacturers. If a facility already uses wheat starch in other products, they may get a discount on bulk purchasing.

So while most brands stick with cornstarch, these benefits help explain why some powdered sugar contains wheat starch instead. Again, it just emphasizes the importance of checking ingredients for gluten.

How Powdered Sugar is Made

Understanding the production process for powdered sugar can shed light on how gluten could potentially get introduced:

1. Start with granulated sugar. The sugar used is typically either cane or beet sugar. Neither type contains gluten.

2. Mill the granulated sugar. The sugar crystals are milled down into a fine powder using stainless steel rollers or grinding machines. Does not introduce gluten.

3. Sift the powder through tiny mesh screens. This separates out any large particles, leaving ultra-fine powdered sugar behind. Does not introduce gluten.

4. Mix in the anti-caking agent. Cornstarch or wheat starch is mixed into the powdered sugar to prevent clumping. This is where gluten could be introduced if wheat starch is used.

5. Package the final product. The powdered sugar is packaged into bags or other retail containers. No risk of gluten exposure at this point.

So the key step where gluten could be introduced is when the anti-caking agent is mixed in. If cornstarch is used, the product remains gluten free through the entire process.

How to Tell if Powdered Sugar Contains Wheat Starch

The best way to tell if a brand of powdered sugar contains wheat starch is to read the ingredient list on the packaging.

Here are some things to look for:

– Ingredients: Sugar, cornstarch – If these are the only ingredients, the powdered sugar does not contain wheat starch or gluten.

– Contains wheat starch – If the ingredients explicitly list “wheat starch”, then the product contains gluten.

– Vague ingredients like “starch” – This could potentially be wheat starch. Best to contact the manufacturer to check the source or avoid it.

– No ingredients listed – Without an ingredients list, you can’t tell if wheat starch is used. Reach out to the brand to find out.

– “May contain wheat” warning – This is a sign wheat starch may be used occasionally. Check with the brand if gluten free is important.

So carefully reading the ingredients list provides the best clue about whether a powdered sugar contains gluten from wheat starch. When in doubt, contact the manufacturer directly to inquire about their ingredients.

Is Powdered Sugar Processed on Shared Equipment?

Many food production facilities use shared equipment to process multiple products. This raises the concern that gluten could be introduced into gluten-free products through cross-contamination.

For powdered sugar, the risk of cross-contamination depends on the brand and facility:

– Dedicated gluten-free facilities: Some brands like Domino are processed in dedicated gluten-free plants, eliminating the risk of cross-contamination.

– Separated production lines: Even in mixed-use facilities, powdered sugar is often run on dedicated lines separate from gluten-containing products.

– Stringent cleaning protocols: Most facilities thoroughly clean equipment between production runs of different products. This significantly reduces cross-contamination risks.

– Periodic gluten testing: Many brands test for gluten periodically to verify there is no unintended cross-contamination.

So while you can never be 100% sure, major powdered sugar brands take steps to avoid gluten cross-contamination risks. Smaller brands may be more prone to such risks in shared facilities.

If you have celiac disease or a wheat allergy, it’s smart to look for brands that state they are processed in a dedicated gluten-free facility whenever possible.

Is Powdered Sugar Safe on a Gluten-Free Diet?

Most nutrition experts consider mainstream powdered sugar brands that just contain sugar and cornstarch to be safe for gluten-free diets.

However, some important caveats exist around powdered sugar for people with celiac disease or wheat allergies:

– Double check ingredients every time for wheat starch. Never assume a brand is always gluten free, as formulations can change.

– Look for gluten-free certification symbols from organizations like the GFCO. This provides added assurance the product has been tested.

– Opt for major national brands processed in dedicated gluten-free facilities when possible. They present lower cross-contamination risks.

– Consume in moderation as part of an overall healthy diet, since powdered sugar offers little nutritional value.

– Be extra diligent around the holidays. Seasonal powdered sugar may be more prone to gluten exposure from temporary workers and rushed production schedules.

So while most powdered sugar is considered gluten free, take some extra precautions if you have celiac disease or a wheat allergy. And no matter what, make sure to check those ingredients!

What to Look for When Buying Powdered Sugar

If you want to make sure you’re purchasing a gluten-free powdered sugar, here are some tips for selecting a brand at the grocery store:

– Check for gluten-free certification symbols like the GFCO label. This indicates third-party testing.

– Read the ingredients list and make sure it only lists sugar and cornstarch, without any wheat starch.

– Look for brands that state “Gluten-Free” clearly on the packaging. This shows they comply with FDA standards for using that label.

– Opt for larger mainstream brands like Domino, C&H, and Dixie Crystals that are made in dedicated facilities.

– Be wary of store or generic brands, which may be more likely to use wheat starch.

– Avoid bags that only say “Made in a facility with wheat” or have unclear ingredients.

– Reference online lists of gluten-free brands, like those from or GlutenFreely.

– When in doubt, contact the manufacturer directly and ask about their production process.

Following these simple tips can help youfeel confident that the powdered sugar you choose is free of gluten and safe to enjoy.

Is Powdered Sugar Gluten-Free? The Short Answer

After looking in detail at how powdered sugar is made and the ingredients used, what’s the short answer to our original question?

Is powdered sugar gluten free?

The majority of national brand powdered sugar products are gluten free. They are made using just sugar and cornstarch as ingredients. However, some store brands may potentially contain wheat starch. So it’s important to always check the ingredients list to confirm the powdered sugar is gluten-free. When in doubt, contact the manufacturer directly to inquire about any gluten-containing ingredients.


While most powdered sugar is gluten-free, it pays to be cautious if you have celiac disease or a wheat allergy. Always check the ingredients for any sign of wheat starch, look for gluten-free certifications, and aim to buy national brands made in dedicated facilities when possible. With some careful label reading and wise brand selection, you can enjoy your favorite powdered sugar treats without worrying about gluten!

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