It's not always necessary to take supplements for overall health if you have a balanced diet. However, certain populations like pregnant women, older adults, or those with specific deficiencies may benefit from supplements. Some nutrients like vitamin D, omega-3 fatty acids, and iron might be harder to obtain solely through diet. Yet, relying solely on supplements can't replicate the benefits of whole foods which provide a variety of nutrients, fiber, and other compounds. Consult a healthcare professional before starting any supplement regimen to ensure it's appropriate for your individual health needs.