Yang takes ground pearl as a case in point. A full 97.5 % of pearl is calcium carbonate, which has no therapeutic value. Only 2.5 % is composed of medicinally useful amino acid.
楊建新舉例，珍珠的成分，百分之九十七・五是沒有作用的碳酸鈣，只有百分之二・五是動物性氨基酸，也是珍珠的價值所在。