The active ingredients of tea and its health effects have been a hot topic in tea research at home and abroad.Dark tea is a typical microbial post-fermented tea.Studies have shown that alkaloids,flavonoids,free amino acids,peptides,polyphenols,pigments,polysaccharides a...MORE The active ingredients of tea and its health effects have been a hot topic in tea research at home and abroad.Dark tea is a typical microbial post-fermented tea.Studies have shown that alkaloids,flavonoids,free amino acids,peptides,polyphenols,pigments,polysaccharides and other bioactive components produced in the fermen...