Micronutrients That Matter for Athletes: A Practical Guide to Vitamins and Minerals

Why Micronutrients Matter for Athletes

Micronutrients—vitamins and minerals—are essential for energy production, muscle function, bone health, and recovery. While macronutrients provide the fuel for exercise, micronutrients help your body convert that fuel into usable energy, repair tissues, and maintain a strong immune system. For athletes, even marginal deficiencies can affect performance, recovery, and long-term health.

There are no official micronutrient recommendations specific to athletes; individualized guidance is needed. General dietary reference intakes (DRIs) are designed for the general population and may not fully cover the needs of those with high training volumes. However, athletes with high energy intake from a well-balanced diet may meet these general targets. If you train intensely or follow a restricted diet, pay extra attention to the nutrients below.

Sources: Food and Chemical Toxicology (Elsevier), Academy of Nutrition and Dietetics

Iron: Function, Needs, and Food Sources

Iron is essential for oxygen transport in the blood. It is a key component of hemoglobin, which carries oxygen to working muscles. Iron deficiency can cause fatigue and impair physical performance. Athletes may have increased iron needs due to exercise-related losses, such as through sweat and gastrointestinal bleeding, and decreased absorption.

Some athletes, especially female athletes and runners, are at higher risk for iron deficiency. If you are vegetarian or vegan, you consume a plant-based form of iron (non-heme iron) that is less easily absorbed than the heme iron from animal products. Pairing iron-rich plant foods with vitamin C can enhance absorption. Include lean red meat, poultry, fish, beans, lentils, tofu, and fortified cereals in your diet. If you suspect a deficiency, a blood test can confirm it, and a healthcare professional can recommend appropriate supplementation.

Sources: Academy of Nutrition and Dietetics, Sports (Basel), MDPI, Mass General Brigham, Idaho Sports Medicine Institute

Calcium and Vitamin D: Bone Health

Calcium and vitamin D are essential for bone health. Maintaining strong bones is critical for athletes to reduce the risk of stress fractures and other bone-related injuries. Calcium is also necessary for muscle contraction, while vitamin D supports calcium absorption and immune function.

Dairy products, leafy green vegetables, and fortified plant milks are excellent calcium sources. Vitamin D is unique because your body can produce it from sunlight, but season, time of day, cloud coverage, geographic location, and skin color all affect how much you synthesize. Foods like fatty fish, egg yolks, and fortified dairy products also contribute vitamin D. If you train indoors or live in northern latitudes, you might need to pay extra attention to your vitamin D status.

Sources: Academy of Nutrition and Dietetics, Idaho Sports Medicine Institute

B Vitamins: Energy Metabolism

The B vitamins—including thiamin, riboflavin, niacin, B6, B12, and folate—are involved in energy metabolism. They help convert carbohydrates, fats, and proteins into energy that your muscles can use during exercise. A deficiency can lead to fatigue and reduced performance.

B12 is found naturally only in animal products, so vegans and vegetarians may be at risk for deficiency. Good sources of B vitamins include whole grains, eggs, meat, poultry, fish, dairy, legumes, and leafy greens. If you follow a plant-based diet, consider a B12 supplement or fortified foods on the advice of a healthcare professional.

Sources: Academy of Nutrition and Dietetics, Mass General Brigham, Journal of Sports Medicine and Therapy (HSPIOA), Aavalabs

Antioxidants: Vitamins C and E

Intense exercise increases oxidative stress, which can damage cells. Vitamins C and E are antioxidants that can help reduce exercise-induced oxidative damage. Foods rich in vitamin C include citrus fruits, strawberries, bell peppers, and broccoli. Vitamin E is found in nuts, seeds, and vegetable oils.

While antioxidant supplements might seem beneficial, excessive intake could blunt some of the beneficial adaptations to training. The evidence does not support high-dose antioxidant supplements for well-nourished athletes. Instead, focus on a diet rich in colorful fruits and vegetables to provide natural antioxidants.

Sources: Food and Chemical Toxicology (Elsevier), Journal of Sports Medicine and Therapy (HSPIOA)

Zinc and Magnesium: Muscle Function

Zinc is important for immune function and tissue repair. It may be lost in sweat, so athletes with high sweat rates might have higher needs. Good food sources include oysters, beef, poultry, beans, and fortified cereals.

Magnesium is involved in more than 300 enzymatic reactions, including ATP production and muscle contraction. It contributes to normal muscle function and may help with recovery. While sweat losses during long sessions can deplete magnesium levels, this claim is less well-established in the scientific literature we reviewed. Include magnesium-rich foods like nuts, seeds, whole grains, and leafy green vegetables in your diet.

Sources: Journal of Sports Medicine and Therapy (HSPIOA), Aavalabs

How to Assess Your Micronutrient Intake

A food-first approach is the best way to meet your micronutrient needs. Start by tracking what you eat for a few days using a food diary or app, and compare your intake to general dietary reference intakes. Remember, however, that these targets are not athlete-specific, so they provide a general benchmark rather than a definitive answer.

If you restrict calories, follow a vegan diet, or train in high-altitude environments, you may be at greater risk of deficiency. In such cases, consultation with a sports dietitian is valuable. They can assess your diet, order blood tests if needed, and offer personalized guidance. Supplementation is warranted only in cases of diagnosed deficiency or when dietary intake is insufficient, and it should be prescribed by a medical professional.

• Keep a food diary for 3–5 days, recording both foods and fluids.
• Use a reliable nutrition app to estimate vitamin and mineral intake.
• Compare your intake to the DRI for your age and sex.
• If you have concerns, seek advice from a registered dietitian.

Sources: Food and Chemical Toxicology (Elsevier), Academy of Nutrition and Dietetics