Micronutrients

Micronutrients are essential vitamins and minerals that the body requires in small quantities — milligrams or micrograms per day — to support normal growth, development, and physiological function. Despite being needed in tiny amounts compared to macronutrients, micronutrients are indispensable: they serve as cofactors for enzymes, components of hormones, building blocks for bones and blood cells, antioxidant defenders, and regulators of gene expression.

There are 13 essential vitamins divided into two categories: fat-soluble (A, D, E, K — stored in body fat and liver) and water-soluble (C and eight B vitamins — not stored significantly, requiring regular intake). Essential minerals include macrominerals needed in larger amounts (calcium, phosphorus, magnesium, sodium, potassium, chloride) and trace minerals needed in smaller amounts (iron, zinc, copper, manganese, iodine, selenium, molybdenum, chromium, fluoride).

Micronutrient deficiencies remain a major global health concern, affecting an estimated 2 billion people worldwide — often called 'hidden hunger' because deficiency can exist without overt symptoms for extended periods. Even in developed nations, suboptimal intake of vitamins D, B12, iron, calcium, magnesium, and potassium is common, particularly among elderly populations, vegetarians, pregnant women, and people with restrictive diets or malabsorption conditions.

Micronutrient status can be assessed through blood tests for specific vitamins and minerals when deficiency is suspected. Common tests include vitamin D (25-hydroxyvitamin D), vitamin B12, iron studies (ferritin, serum iron, TIBC), folate, and magnesium. Symptoms of deficiency are often nonspecific — fatigue, weakness, poor immunity, impaired wound healing — making testing important for accurate diagnosis.

For most healthy individuals, a balanced diet provides adequate micronutrients. Supplementation may be recommended for specific populations (prenatal vitamins during pregnancy, vitamin D for those with limited sun exposure, B12 for vegans, iron for menstruating women with heavy periods) or documented deficiencies. Megadose supplementation without medical indication is not recommended and can be harmful.