In an intensive management approach, herbal essential oils (EOs) can be utilized as an antibiotic substitute to improve animal performance. Eos possesses antibacterial, antioxidant, digestion-stimulating, enzymatic enhancer, growth-promoting, immune-stimulating, hypocholesterolemic, and hypolipidemic properties. However, due to specific features such as being very sensitive to environmental elements such as oxygen, light, and temperature, there are some restrictions on their use in poultry diets. During preparation, use, and storage, they are also volatile, evaporative, and unstable. In addition to a high sensitivity to peroxidation, which resulted in decreased palatability and feed intake, particularly when utilized in large quantities. Microencapsulation or Nano-encapsulation technology is one approach for keeping active substances in order to increase effective delivery and controlled release. Chitosan is a water-soluble natural carbohydrate polymer (made by the partial N-deacetylating chitin of crustacean shells and some microorganisms) has been employed as a polymeric carrier for nanoparticles as it is biocompatible, biodegradable, non-toxic and affordable. Eos Nano encapsulation improves broiler performance by boosting body weight, growth, feed intake, and feed conversion ratio compared to the non-encapsulated form.