Vitamin C is a well-known nutrient naturally abundant in citrus fruits such as oranges and lemons, and it is also frequently added to foods to enhance flavor and act as a natural preservative. Vitamin K2, commonly found in fermented foods like cheese and natto, and vitamin D3—also called cholecalciferol, which can be obtained from sunlight exposure—are both recognized for their nutritional value. Together, these vitamins are popular ingredients in modern wellness products, valued for their presence in a balanced daily routine.