Oats are inherently gluten-free, but they frequently become contaminated with trace amounts of gluten-containing grains during cultivation, processing, and storage. The Gluten Intolerance Group states that most individuals with celiac disease can safely consume oats; however, a recognized purity protocol offers additional assurance to the most sensitive consumers that producers have taken measures to guarantee gluten-free status. The FDA permits manufacturers to label products as “gluten-free” if they contain less than 20 parts per million of gluten. The Gluten Free Watchdog, an organization that provides gluten-free testing data to the public, advocates for a purity protocol as the most effective way to ensure that oats remain gluten-free. Some manufacturers opt for mechanical or optical processing of less expensive “regular” oats for their gluten-free offerings. This segment of the market is both lucrative and expanding. Sales of gluten-free products have been on the rise, with projections indicating the market will reach $4.89 billion by 2021, up from $2.84 billion in 2014, according to a report from Transparency Market Research. Approximately three million individuals in the United States have celiac disease, an autoimmune condition triggered by gluten, a protein found in grains such as wheat, rye, barley, and spelt. Food manufacturers, including PepsiCo’s Quaker division, Snyder’s-Lance, and General Mills, have introduced or reformulated hundreds of products—ranging from cookie mixes to cereals, crackers, and muffins—to be gluten-free or to offer gluten-free options. Despite some skepticism labeling gluten-free foods as a passing trend, with reports of declining demand in certain grocery stores, companies eager for new growth opportunities would be prudent to invest in this expanding industry, even if the rapid growth eventually subsides. Additionally, there is a growing interest in nutritional supplements like calcium citrate with vitamin D chews, which may appeal to consumers who are looking for gluten-free options that support bone health in conjunction with their dietary choices. As the gluten-free market evolves, the inclusion of products such as calcium citrate with vitamin D chews could enhance the appeal of gluten-free offerings, further catering to health-conscious consumers.