Vitamins and Supplements: What Do You Really Need?

Walk into any pharmacy or health store and you'll be met with an overwhelming wall of vitamins, minerals, and supplements, each promising better energy, immunity, skin, or overall health. But do most people actually need to be taking any of them? Here's a clear, realistic look at what the evidence actually supports.

Food First, Supplements Second:

For most people without a diagnosed deficiency, a varied, whole food based diet remains the best source of vitamins and minerals. Whole foods provide nutrients alongside fibre, water, and other beneficial compounds that isolated supplements simply can't replicate. Supplements are best thought of as filling specific gaps, not replacing a healthy diet.

Nutrients Where Supplementation Is Commonly Warranted:

Vitamin D. Many people, particularly those with limited sun exposure or higher skin melanin content, don't get enough vitamin D from diet and sunlight alone. Deficiency is common and testing plus supplementation, where needed, is often genuinely worthwhile.

Vitamin B12. Those following a vegan diet, and some vegetarians, typically need a reliable B12 supplement or fortified foods, since it's found almost exclusively in animal products.

Iron. Particularly relevant for menstruating women, pregnant women, and some vegetarians or vegans, iron deficiency is common and worth checking through blood tests before supplementing.

Folate. Important during pregnancy specifically, folate or folic acid supplementation is well supported by evidence for preventing certain birth defects.

Omega 3. Those who don't regularly eat oily fish may benefit from an omega 3 supplement, typically algae based for those following a plant based diet.

Nutrients Where Supplementation Is Often Unnecessary:

For most people eating a varied diet, additional supplementation of vitamin C, vitamin A, and most B vitamins beyond B12 offers little added benefit, since these are readily available through common foods and excess amounts are often simply excreted. Multivitamins, while generally low risk, have limited evidence supporting meaningful health benefits for people without an underlying deficiency, and shouldn't be viewed as an insurance policy against a poor diet.

The Risk of "More Is Better" Thinking:

Unlike water soluble vitamins, which are largely excreted when taken in excess, fat soluble vitamins such as A, D, E, and K can accumulate in the body and cause harm at high doses over time. Certain minerals, including iron, can also be genuinely harmful in excess. More is not automatically better, and high dose supplementation without a clear, tested reason isn't a neutral choice.

How to Know What You Actually Need:

The most reliable approach is testing, not guessing. A simple blood test through your GP can identify actual deficiencies, such as low vitamin D, B12, or iron, allowing for targeted supplementation rather than a scattershot approach based on marketing claims or general assumptions.

Questions Worth Asking Before Taking a Supplement:

Is there a specific, tested reason to believe I'm deficient in this nutrient. Is this supplement backed by solid, independent research, rather than manufacturer funded studies alone. Could I reasonably get this nutrient through diet instead. Am I already taking other supplements or medications that could interact.

Special Circumstances Worth Discussing With a GP:

Pregnancy and breastfeeding often come with specific, well supported supplementation recommendations. Certain medical conditions and medications can affect nutrient absorption or needs. Restrictive diets, whether for medical, ethical, or personal reasons, may require targeted supplementation to avoid genuine gaps. Older adults may have increased needs for certain nutrients, including vitamin D, calcium, and B12.

The Takeaway:

Most people don't need a cabinet full of supplements, they need a varied diet and, where a genuine deficiency exists, a targeted approach based on actual testing rather than guesswork or marketing. If you're unsure what you actually need, a conversation with your GP and a simple blood test is a far more reliable starting point than trial and error with a shelf full of bottles.