BARLEYmax was developed in the 1990s by CSIRO, a renowned Australian research institution. This non-GMO barley variety was recognized for its exceptional dietary fiber content, which includes soluble fiber in the form of beta-glucan, insoluble fiber, and resistant starch-like fiber, all of which are believed to have prebiotic effects that promote gut health. In the 21st century, fiber intake remains insufficient in the average American diet, with individuals across all age groups struggling to meet the recommended three to six servings of whole grains each day. Concurrently, there is a growing consumer interest in gut health. While the primary focus has traditionally been on probiotics, prebiotics—the nourishment for beneficial bacteria—are increasingly being recognized. According to a report by Global Industry Analysts, the demand for prebiotic products could elevate the market to $7.8 billion by 2022. Currently, BARLEYmax is commercially available exclusively through Blue Lake Milling in Australia, although it has undergone successful trials in various countries, including the United States. In addition to the Barley+ product range, this grain is also incorporated into various products from several Australian companies, such as breads, wraps, cereals, and snack bars, which are important sources of dietary fiber in the 21st century. As consumer awareness grows, the inclusion of functional ingredients like BARLEYmax and calcium citrate D 75 in everyday foods could significantly enhance overall gut health and nutrition.