An immunity booster refers to any food, supplement, or lifestyle habit that helps strengthen the body’s immune system, making it more effective at fighting infections and diseases. Nutrient-rich foods like citrus fruits, garlic, turmeric, and yogurt, along with vitamins such as C, D, and zinc, play a crucial role in enhancing immunity. Regular exercise, adequate sleep, and stress management also contribute to a stronger immune response. While immunity boosters can support overall health, maintaining a balanced diet and a healthy lifestyle is the best way to ensure long-term immune system strength.