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This article provides reviews of the following: principal regulatory frameworks governing the supply of feed products for horses, focusing on the United States and Europe with guidance on compliance; key federal, state, or country requirements to ensure safe and accurately labeled products; rules concerning antidoping with a review of naturally occurring prohibited substances commonly found in feedstuffs; essential information for brand holders of equine nutrition products, practicing veterinarians, independent nutritionists, research scientists, competition riders and racehorse trainers, and those responsible for the direct feeding of horses., Competing Interests: Disclosure R. Bishop is employed by Premier Nutrition Ltd. Premier Nutrition Ltd manufactures premixes and complementary feeds / supplements for animal feed businesses. Regulatory Discretion, Inc (D.A. Dzanis) offers independent consulting services to the animal feed and related industries on matters relating to US regulation, labeling, and nutrition., (Copyright © 2021 Elsevier Inc. All rights reserved.)

Stem cell-based products (SCPs) are an emerging field of veterinary medicine that focuses on the regeneration, repair, or replacement of damaged tissues or organs. However, there are some issues in applying the traditional regulatory guideline for the approval of SCPs as veterinary medicinal products. This article describes the positions of Korea, US, and EU regarding SCPs, and compares the regulatory guidelines of each country for their safety evaluation. Although there are some differences in the regulatory guidelines, similar considerations in identifying the quality of SCPs and their safety has adopted. Overall, these guidelines need to be harmonized among countries., Competing Interests: The authors declare no conflicts of interest., (© 2021 The Korean Society of Veterinary Science.)