Do You Really Need Supplements? The Hidden Risks and Real Benefits

Many people turn to supplements to boost their health, but not everyone needs them. While certain groups benefit from extra nutrients, others risk harm by taking high doses without proper testing. A balanced diet often provides enough vitamins and minerals—yet some deficiencies remain common, even in industrialised countries.

Vitamin B12 deficiency affects a large portion of the population. Between 25-50% of women and 5-25% of men lack sufficient levels, with older adults most at risk. Around 6% of people over 60 have clinically low B12, and this number climbs with age. Those with thyroid issues are especially vulnerable, with 40% showing deficiencies.

Vegetarians and vegans often struggle with shortages in iron, zinc, copper, vitamin B12, iodine, and L-carnitine. Without careful planning, plant-based diets can miss key nutrients. Legumes, tofu, and tempeh help by supplying amino acids, iron, zinc, magnesium, and fibre, which also support digestion.

Green vegetables like broccoli, spinach, and arugula pack magnesium, calcium, vitamin K, folate, and sulforaphane. Orange and red vegetables deliver beta-carotene, which the body converts into vitamin A. Purple foods, meanwhile, offer polyphenols and anthocyanins—compounds linked to better health.

Whole grains, oats, quinoa, and buckwheat are rich in B vitamins (except B12). Nuts and seeds replenish omega-3 stores, a fatty acid many people lack. Common deficiencies also include vitamin D3 in colder months, zinc, and magnesium.

Not everyone requires supplements. Middle-aged individuals with a balanced diet, regular exercise, and no chronic illnesses usually get enough nutrients from food. However, older adults, teenagers with poor diets, and those recovering from surgery or chemotherapy often need extra support. Overweight people may appear healthy but still face risks like high blood pressure or impaired glucose tolerance.

Experts warn against high-dose supplements without proper testing. Indiscriminate use can lead to severe side effects. Regular blood tests are recommended to check for deficiencies or imbalances before starting any new regimen.

Supplements play a role for specific groups, but they are not a universal solution. Blood tests help identify real deficiencies, preventing unnecessary or harmful intake. For most healthy people, a varied diet with vegetables, whole grains, and legumes covers essential nutrient needs.