In the colder months of the year, during seasonal changes or periods of severe stress, the immune system weakens and the body has more difficulty fighting off infections and diseases. Eating fruits, vegetables, taking probiotics and playing sports helps to strengthen your immune system. However, when good nutrition and sports are not enough, the best way to treat your body is to use natural remedies made with medicinal plants that stimulate the immune system. ESI offers three lines of natural supplements that strengthen the immune system according to your specific needs. Immunilflor helps the immune system and supports intestinal function; Echinaid is a complete line of immune system boosters that contain two types of Echinacea, able to respond to various physical needs and to prevent nasty ailments during the cold season; Propolaid products, which are made with purified and titrated Propolis, promote the health of the oral cavity and upper respiratory tract.