Curcumin Mitigates Microplastic-Induced Damage in Livestock and Poultry: Mechanistic Insights and Strategies for Sustainable Farming

The pervasive contamination of microplastics and nanoplastics (MNPs) in livestock and poultry production systems represent a critical threat to animal health, productivity, and food safety. This review systematically evaluates the potential of curcumin, a natural polyphenol from <i>Curcuma longa</i>, to mitigate MNP-induced toxicity, drawing on evidence from 25 preclinical studies (2014-September 2025). We highlight that curcumin exerts broad-spectrum, dose-dependent protection primarily through a dual mechanism: the preventive activation of the Nrf2/ARE antioxidant pathway and the therapeutic suppression of NF-κB-driven inflammation. These actions collectively ameliorate oxidative stress, restore metabolic homeostasis (e.g., via the gut-liver axis), and reverse histopathological damage across key organs, including the liver, kidneys, and reproductive tissues. A major translational insight is the significant species-specific variation in curcumin bioavailability, which is substantially higher in poultry than in ruminants, necessitating the development of tailored delivery systems such as nanoencapsulation. While the preclinical data are compelling, translating these findings into practice requires robust clinical trials to establish standardized, safe, and effective dosing regimens for food-producing animals. This review concludes that curcumin presents a promising, sustainable phytogenic strategy to enhance the resilience of livestock and poultry systems against MNP pollution, directly contributing to the One Health goals of safeguarding animal welfare, food security, and environmental sustainability.