Vitamins and Supplements: What the Evidence Actually Says
The supplement market is enormous, but not every product on the shelf is backed by strong evidence. Understanding which supplements have genuine support โ and which are largely marketing โ helps you spend wisely.
Vitamin D is one of the most widely recommended supplements in the UK, and for good reason. Between October and March, sunlight in Britain is too weak for the skin to produce adequate vitamin D, and deficiency is common. The NHS recommends a daily supplement of 10 micrograms (400 IU) for all adults during autumn and winter, and year-round for those who spend little time outdoors or cover their skin.
The Role of a Balanced Diet
Most vitamins and minerals are best obtained through food. A varied diet rich in fruit, vegetables, whole grains, lean protein, and healthy fats provides the full spectrum of nutrients that isolated supplements cannot replicate. Food contains thousands of compounds that work together in ways that a single vitamin tablet does not. Supplements are intended to fill specific gaps โ not to replace meals.
When Supplements Make Sense
Certain groups have specific needs. Pregnant women are advised to take folic acid and vitamin D. Vegans should supplement vitamin B12, which is found naturally only in animal products. Older adults may benefit from calcium and vitamin D for bone health. Iron supplements are appropriate for diagnosed deficiency, but should not be taken routinely without a blood test โ excess iron can be harmful. For everyone else, a standard multivitamin is a reasonable insurance policy, but it is not a substitute for eating well.
