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Optimal serum levels for ultra-endurance runners/walkers
| Micronutrient | Serum marker | Optimal serum level |
|---|---|---|
| Vitamin C | L-Ascorbic acid | 40-60 μM |
| Calcium | Calcium | 4.5–5.5 mEq/L |
| Vitamin D | 25-hydroxyvitamin D | 75–100 nmol/L |
| Vitamin E | Alpha Tocopherol | 5.5–17 µg/mL |
| Folate | Plasma folate | 2.7–20 μg/L |
| Vitamin B12 | Holotranscobalamin | 35–156 pmol/L |
| Iron | Ferritin | >50 ng/mL |
| Magnesium | Magnesium | 1.5–3.0 mEq/L |
| Zinc | Zinc | 84–159 µg/dL |
