Whole foods provide vitamins and minerals alongside fibre, protein, healthy fats and thousands of plant compounds that work together in ways a pill cannot reproduce. Supplements typically contain isolated nutrients in fixed doses and miss most of this complexity, which is why diet quality consistently matters more than supplementation for long-term health.
Supplements are best seen as a way to fill a specific, identified gap, for example vitamin D in winter, B12 on a vegan diet, or folic acid before and in early pregnancy, rather than as insurance to make up for a poor diet. Relying on them instead of food can give false reassurance.
If your diet is restricted by choice, allergy, illness or budget, a targeted supplement can help, but the priority should still be improving the underlying diet where possible. A doctor or dietitian can help identify which, if any, supplements you actually need.