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The Dietary Supplement Health and Education Act (DSHEA) is the regulatory framework that governs the labeling and marketing of dietary supplements, specifically regarding structure/function claims. This act allows manufacturers to state how a dietary supplement affects the body's structure or function, as long as these claims are not misleading and the products are properly labeled. The regulations ensure that such claims are substantiated by evidence, though they are not subject to the same rigorous pre-market approval as pharmaceutical drugs. While the U.S. Food and Drug Administration (FDA) plays a significant role in overseeing dietary supplements and ensuring compliance with the laws, it is the DSHEA that specifically grants the allowance for structure/function claims. The Nutrition Labeling and Education Act (NLEA) pertains mainly to the labeling of conventional foods and specific nutrient claims, rather than dietary supplements. The United States Department of Agriculture (USDA) primarily regulates meat, poultry, and eggs, and is less involved with dietary supplement claims. Thus, the correct answer reflects the framework specifically designed to regulate how structure/function claims on dietary supplements can be communicated to consumers.