Described herein are emulsion compositions comprising fish oil and medium-chain triglycerides (MCT) and/or omega-3 fatty acids and medium-chain triglycerides (MCT). In some embodiments, the compositions further comprise, e.g., alpha-tocopherol, or one or more fatty acids. Further provided herein are methods of using the compositions, e.g., to provide nutrion, e.g., parenteral nutrition to a subject and/or to treat or prevent certain conditions described herein.