7.5 Micronutrients: Vitamins and Minerals
Micronutrients—vitamins and minerals—do not directly build muscle or provide energy, but they are essential cofactors in virtually every metabolic process your body runs. Enzyme function, immune response, bone health, oxygen transport, nerve conduction, and hormone production all depend on adequate micronutrient status. A chronic deficiency in even a single micronutrient can impair recovery, reduce training performance, and undermine overall health.
The good news: if you eat a varied diet with plenty of vegetables, fruits, lean proteins, and whole grains, you are likely covering most of your micronutrient needs. The problem is that many people don’t.
Common Deficiencies in Western Diets
| Micronutrient | Why It Matters | Who’s at Risk | Practical Fix |
|---|---|---|---|
| Vitamin D | Bone health, immune function, mood, and possibly muscle function | Anyone in northern latitudes, office workers, darker-skinned individuals | Supplement 1000–2000 IU/day if blood levels are below 30 ng/mL; get tested |
| Iron | Oxygen transport (hemoglobin), energy metabolism | Women (menstruation), vegetarians/vegans, endurance athletes | Get ferritin tested before supplementing — excess iron is harmful |
| Magnesium | Muscle contraction, sleep quality, nerve function, 300+ enzymatic reactions | Athletes (lost through sweat), anyone with a low-vegetable diet | 200–400 mg/day from food or supplementation (magnesium glycinate is well-absorbed) |
| Omega-3 (EPA/DHA) | Anti-inflammatory, cardiovascular health, brain function | Anyone who doesn’t eat fatty fish 2–3x/week | 1–2 g combined EPA/DHA from fish oil or algae oil |
Practical Advice
- A daily multivitamin is a cheap insurance policy. It will not transform your health, but it covers baseline gaps for pennies a day. Think of it as a safety net, not a performance enhancer.
- Don’t megadose. More is not better for micronutrients. Fat-soluble vitamins (A, D, E, K) accumulate in the body and can reach toxic levels. Water-soluble vitamins (B-complex, C) in excess are simply excreted—expensive urine.
- Food first. Whole foods contain micronutrients in forms and combinations that supplements cannot replicate. A supplement is a supplement—it supplements a good diet, it does not replace one.