ACE and hypertensive disorder: Recently, many renin and ACE inhibitory peptides obtained from plant or foodstuff sources have been investigated, including bean hydrolysates,5 amaranth proteins,6 beef hydrolysates,7 flaxseed protein,8,9 and bovine fibrinogen.10 Although these food-derived peptides have provided new ideas for the prevention and treatment of hypertension, the efficacy of these peptides in the human body needs to be further verified.