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Dose–response curve of prenatal supplementation of the arginine family on fetal/birth weight in complicated pregnancies: Daily dose is expressed as mg per kg metabolic body weight. Open dots indicate human studies, and closed dots indicate animal studies. There is no dose–response relation between prenatal supplementation of amino acids from the arginine family and birth weight ratio (pslope = 0.81). An increase of 10% was already reached at the lowest dose.
