Dr. Shen's coldstop tablets are a 100% herbal blend of extra-strength botanicals that includes burdock, hairy sage and licorice root to be taken when cold symptoms first occur. Also known as dr. Shen's yin chiao pills, this formula comes in a convenient 15-count package, is made in the united states under strict quality standards and contains no drugs, dyes, preservatives or animal products for an all-natural blend.