Final answer:
The MHRA (Medicines and Healthcare Products Regulatory Agency) is the agency that regulates dietary supplements in the United Kingdom, ensuring safety and efficacy of these products.
Step-by-step explanation:
The governmental agency that regulates dietary supplements in the United Kingdom is the MHRA (Medicines and Healthcare Products Regulatory Agency). In contrast to the regulation of food and dietary supplements by the U.S. Food and Drug Administration (FDA), which is governed by various statutes enacted by the United States Congress, the MHRA is responsible for ensuring that medicines and medical devices work and are acceptably safe. It is important to understand that while dietary supplements in the US are treated like food rather than pharmaceuticals and must meet the FDA's Good Manufacturing Standards, they are not required to meet the same standards as drugs. The regulation in the UK by the MHRA similarly focuses on the safety and efficacy of these products.