Dietary supplements serve various functions in a fitness regimen. They can help fill nutrient gaps in the diet, ensuring adequate intake of vitamins, minerals, and other essential compounds. For athletes, protein powders can support muscle recovery and growth. Supplements like omega-3 fatty acids can enhance overall health and reduce inflammation. However, it’s crucial to use them responsibly and consult healthcare professionals to avoid potential interactions or side effects, emphasizing that whole foods should be the primary source of nutrients whenever possible.