瓜氨酸。参见：
http://www.medipharmalimited.com/tyson/L-Citrulline_tc.htm
http://en.wikipedia.org/wiki/Citrulline
瓜氨酸。参见：
http://www.medipharmalimited.com/tyson/L-Citrulline_tc.htm
http://en.wikipedia.org/wiki/Citrulline