Natural Coconut Source. Immune System Support Formula. Plus Vitamin C and Herbs. Monolaurin is a mono-ester of lauric acid a fatty acid found in coconut oil and present in breast milk. It has been studied for its reputed ability to provide nutritive support for the immune system. Solaray® Monolaurin also contains Vitamin C and a base of the popular herbs Echinacea and Astragalus.