“…Again, the most studied amino acid was arginine ( n = 19) [ 33 , 36 , 37 , 44 , 45 , 46 , 49 , 53 , 54 , 55 , 58 , 59 , 69 , 74 , 75 , 76 , 90 , 91 , 95 ], but also glutamate ( n = 5) [ 54 , 55 , 66 , 148 , 149 ], citrulline ( n = 1) [ 44 ], and glutamine ( n = 1) [ 67 ] were studied. Thirteen studies were conducted in normal-growth pregnancies only [ 33 , 37 , 46 , 58 , 59 , 66 , 67 , 69 , 74 , 75 , 76 , 148 , 149 ], seven were conducted in complicated pregnancies only [ 36 , 44 , 45 , 49 , 53 , 54 , 55 ], three studies had both normal-growth and complicated pregnancy arms […”