Are One Brand Protein Bars Gluten Free?

December 18, 2025 •

3 min read

According to ONE Brands, all of their protein bars, including the classic ONE Bars, ONE Plant Bars, and ONE Basix Bars, are certified gluten-free. This certification confirms that ONE brand protein bars are safe for individuals with celiac disease or a gluten sensitivity, although checking the specific product details for any other allergens is always recommended.

Quick Summary

This article explores whether ONE protein bars are a safe, gluten-free snack option. It examines the brand's certification, explains label implications, discusses cross-contamination risks, and compares ONE to other gluten-free protein bars.

Key Points

Certified Gluten-Free: All ONE protein bars, including their main line, plant-based, and Basix bars, are officially certified gluten-free by a third party.
Low Cross-Contamination Risk: The certification ensures the entire production process meets strict standards, minimizing the risk of cross-contamination with gluten.
High Protein, Low Sugar: Most ONE bars feature an attractive nutritional profile with around 20 grams of protein and only 1 gram of sugar per bar.
Allergen Awareness: While gluten-free, ONE bars are made in a facility that processes common allergens like milk, soy, and nuts, which is noted on the packaging for those with additional sensitivities.
Not a Whole Food: Despite being a convenient snack, ONE bars are a processed product and should complement, not replace, a balanced diet of whole foods.

Understanding the 'Certified Gluten-Free' Label on ONE Bars

ONE Brands has explicitly stated that all of their protein bars carry the 'Certified Gluten-Free' label. This is a crucial distinction for anyone with celiac disease or a serious gluten sensitivity, as it means the product has been tested to contain less than 20 parts per million (ppm) of gluten. This standard is set by the FDA and verified by a third party, giving consumers confidence in the product's safety.

What the Certification Means for You

The 'Certified Gluten-Free' mark on ONE bars is a promise that goes beyond simply not listing gluten-containing ingredients. It signifies that the entire production process, from sourcing ingredients to packaging, is monitored to prevent cross-contamination. This is especially important for protein bars, which are often produced in facilities that also handle products containing wheat, barley, or rye. The certification is a verifiable mark of safety, distinguishing it from products merely labeled 'gluten-free' without third-party verification.

Are all ONE Protein Bars gluten-free?

Yes, the manufacturer confirms that all varieties, including the standard ONE Bars, the plant-based options, and the Basix line, are certified gluten-free. This covers a wide range of flavors, from classic Chocolate Chip Cookie Dough to seasonal and special edition options. Always check the packaging for the most current information, as formulas and certifications can sometimes change, although the brand's commitment has been long-standing.

Potential for Cross-Contamination and Other Allergens

While ONE bars are certified gluten-free, the brand acknowledges that their products are manufactured in a facility that also processes other allergens. For many people with celiac disease or a non-celiac gluten sensitivity, this level of cross-contamination is too low to cause an issue due to stringent cleaning protocols and testing. However, individuals with severe allergies to other ingredients processed in the same facility, such as milk, soy, or nuts, should read the ingredient and allergen warning labels carefully.

Key ingredients in ONE bars

To ensure their bars are gluten-free, ONE Brands uses a protein blend often consisting of milk protein isolate and whey protein isolate. Other common ingredients include prebiotic fiber, vegetable glycerin, and nonfat dry milk. It's the careful selection of these components and avoidance of wheat-based fillers that allows the bars to meet gluten-free standards.

Understanding the nutritional profile

Beyond being gluten-free, ONE bars are known for their high protein content and low sugar count. Most flavors offer around 20 grams of protein and just 1 gram of sugar per bar, making them an attractive option for those monitoring their macronutrient intake. However, it's important to remember that these are processed snacks and not a replacement for a balanced diet rich in whole foods.

Comparison: ONE Bars vs. Other Gluten-Free Protein Bars

When choosing a gluten-free protein bar, it's helpful to compare ONE bars with other popular options on the market. Considerations include nutritional profile, protein source, and certifications.


Feature	ONE Bars	Aloha Protein Bars (Gluten-Free)	Quest Protein Bars (Gluten-Free)
Protein Source	Whey Protein Isolate, Milk Protein Isolate	Plant-based (pea, rice)	Dairy-based (milk, whey)
Protein Content	Up to 20g	Varies (often 10g+)	Often 20g+
Sugar Content	Typically 1g	Varies (often low)	Typically 1-2g
Vegan Option	Some options are vegan (ONE Plant Bars)	All are plant-based/vegan	Contains dairy, not vegan
Certification	Certified Gluten-Free	Certified Gluten-Free	Certified Gluten-Free
Primary Sweetener	Maltitol, Sucralose	Monk fruit sweetener	Erythritol, Sucralose

Conclusion

In summary, all ONE brand protein bars, including their regular, plant-based, and Basix lines, are certified gluten-free and a safe choice for individuals with celiac disease or gluten sensitivities. The certification ensures a rigorous standard of less than 20 ppm of gluten, although those with severe sensitivities to other allergens like milk, soy, and nuts should review the ingredients list carefully. With their high protein, low sugar, and wide variety of flavors, ONE bars provide a convenient and tasty option for those following a gluten-free diet. Always prioritize reading the most recent product labels and combining these snacks with a diet rich in whole, unprocessed foods for optimal health.

For more information on living with celiac disease and understanding food labels, consult a trusted resource like the Celiac Disease Foundation.

Frequently Asked Questions

Yes, ONE Brands confirms that all of their protein bars are certified gluten-free, meeting the strict standards set by the FDA for products containing less than 20 ppm of gluten.

The 'certified gluten-free' label means that the product is manufactured with controls in place to prevent cross-contamination and is regularly tested to ensure it remains below the 20 ppm gluten threshold, providing a high level of safety.

Yes, the ONE Plant Bars are also included in the brand's certified gluten-free product line.

While gluten-free, ONE bars contain other allergens like milk and soy, and are processed in a facility that handles nuts. Always check the 'Contains' and ingredient statements on the package if you have other allergies.

Yes, given that they are certified gluten-free and undergo third-party testing, ONE bars are considered safe for individuals with celiac disease.

'Certified gluten-free' involves third-party verification that the product meets stringent standards of less than 20 ppm gluten throughout production, while 'gluten-free' is a manufacturer's self-claim that the product does not contain gluten ingredients.

This is a standard disclosure for facilities that handle multiple products. The gluten-free certification addresses gluten specifically, but the warning alerts those with other severe allergies to potential exposure from shared equipment.