Cottage Cheese: A Creamy Source of Goodness Cottage cheese brings protein, calcium, and vitamin D to the table, making it a worthy addition to your immune-boosting arsenal. With its vital role in immune function, protein teams up with calcium to keep bones strong, while vitamin D supports immune cell production. Enjoy cottage cheese on its own or get creative by adding it to smoothies, yogurt, or oatmeal for a delicious and nutritious twist.