Garlic and Lemon Strengthen Immunity and the Heart The combination of garlic and lemon brings many benefits for the health of our body and is one of the best ways to preserving the health of blood vessels. In addition, lemon is rich in vitamin C to strengthen immunity, while garlic has an exceptional effect against microbes. Individually, lemon and garlic are used for many ailments and are best known for their effect on strengthening the body's resistance and immunity itself.