Essential Vitamins and Minerals

Vitamin A (retinol) is crucial for vision, skin, and immunity. It's found in liver, dairy products, and as beta-carotene in orange and green vegetables. The B group (eight distinct vitamins) is involved in energy metabolism, red blood cell production, and nervous system function.

Vitamin C is a powerful antioxidant that supports immunity, collagen synthesis, and the absorption of plant-based iron. Citrus fruits, peppers, and kiwis are the best sources. Vitamin D, synthesized by the skin under UV light, is essential for calcium absorption and immunity. In many regions, winter supplementation is often recommended.

Vitamin E protects cell membranes from oxidation (almonds, sunflower oil), while vitamin K is indispensable for blood clotting and bone health (green vegetables, sauerkraut). These two fat-soluble vitamins require fat intake to be properly absorbed.

Iron exists in two forms: heme (red meat, organ meats, very well absorbed) and non-heme (legumes, spinach, less well absorbed). Iron deficiency is common in certain populations. Pairing plant-based iron with vitamin C doubles its absorption.

Calcium is the body's most abundant mineral, 99% concentrated in bones and teeth. Dairy products are the most concentrated source, but kale, broccoli, almonds, and whole sardines also provide significant amounts. Absorption depends on vitamin D.

Magnesium is involved in muscle contraction, nerve transmission, and energy production. Dark chocolate, Brazil nuts, spinach, and whole grains are good sources. Zinc, essential for immunity and wound healing, is found in oysters, red meat, pumpkin seeds, and legumes.

Some nutrients work better together: vitamin C boosts non-heme iron absorption, vitamin D promotes calcium absorption, and vitamin K2 directs calcium to the bones rather than the arteries. These synergies explain why a varied diet is superior to isolated supplements.

Conversely, some nutrients compete: calcium and iron vie for the same intestinal transporters (avoid taking an iron supplement with a dairy product). Coffee and tea reduce non-heme iron absorption by 40 to 60%. Excess zinc can induce a copper deficiency.

In practice, these interactions are managed naturally with a diversified diet and varied meals. If you take supplements, space them out by 2 hours to minimize negative interactions.