Fierul este absorbit in jejun si ileon, proces facilitat de vitamina:

• A (retinol)
• D (Vitamina D este o grupă de vitamine secosteroide liposolubile, cele două forme relevante fiziologice majore fiind vitamina D₂ (ergocalciferol) și vitamina D₃ (colecalciferol). Fără un indice, vitamina D se referă la D₂, D₃ sau ambele)
• C
• E (tocopherol)

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