La premire est endogne , cest--dire que lorganisme est en mesure de la produire
At around 18-20 dpc, the first fetal capillaries and placental macrophages (Hofbauer cells) appear in the stroma of placental villi
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While the RNI for maintenance is only 1.5 g daily, therapeutic oral doses typically range from: 50-150 g daily for mild deficiency prevention in at-risk groups 1,000-2,000 g daily for treating confirmed deficiency without malabsorption Some formulations contain up to 5,000 g, though there is no proven additional benefit over 1,000-2,000 g for most patients The reason for this dosage discrepancy lies in absorption efficiency
These effects are typically short-lived and resolve quickly