Ascorbic acid, or Vitamin C, is essential for boosting immunity and preventing colds and flu. To enhance your health, consider these foods- Guava: Offers 125 mg of Vitamin C, Kale: Provides 93 mg, Kiwi: Contains 56 mg, Lemon: Has 45 mg. Orange: Delivers 83 mg (92% DV). Incorporate these into your diet for better immunity!