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Table 2 Optimal serum levels for ultra-endurance runners/walkers

From: Nutritional implications for ultra-endurance walking and running events

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